Cooperative Institute for Research in Environmental Sciences

Veronica Vaida

Veronica Vaida

Spectroscopic Studies of Atmospheric Molecules, Radicals, and Their Complexes
Professor Vaida's research interest focuses on issues of photoreactivity in the atmosphere. The approach employed to obtain the structure and dynamics of molecules, radicals, and their complexes involves a combination of spectroscopic, photofragment and theoretical techniques. Several lines of inquiry are being pursued:

  1. Small predissociative molecules such as NH3, CS2, OCS, OClO, and O3 are under investigation to obtain the structure and dynamics of their reactive electronic states. The experimental techniques employed for these studies are direct absorption resonance, enhanced multiphoton ionization, laser-induced fluorescence and resonance Raman of supersonically cooled samples. The experimental data are modeled theoretically using ab initio electronic structure theory as well as calculations of chemical dynamics on the reactive potential energy surfaces.
  2. Reactivity in solvent environments is studied using molecular complexes. Spectroscopic perturbations produced by intermolecular interactions are analyzed to bridge the gap between gas and condensed phases. This method employs molecular beam techniques where weakly bound molecular clusters of different composition and size can be produced in a controlled fashion and investigated spectroscopically.
  3. The photochemistry of weakly bound clusters involving dissociative molecules is under investigation. Efficient covalent bond chemistry is observd to compete with energy flow to the weaker van der Waals bonds in molecular dimers containing highly dissociative samples.
  4. The problematic thrust of the group is the investigation of photo-reactive molecules and clusters important in atmospheric chemistry. A recent example is the group's quantitative laboratory study of light-induced reactions important in the stratosphere. In collaboration with Dr. Susan Solomon from the Aeronomy Laboratory at NOAA in Boulder, who has measured the concentration of chlorine dioxide over Antarctica, Professor Vaida's lab proposes, on the basis of its laboratory results, a new chemical reaction that contributes to polar ozone depletion. In parallel, a program to evaluate the photoreactivity of bimolecular complexes formed by molecules or radicals in the atmosphere is being developed. This work aims to obtain a laboratory data base needed for inclusion of the photochemistry or bimolecular complexes in atmospheric models.

Current Research

Atmospheric photochemistry of organic molecules

Our program explores water- and sunlight-mediated processes in planetary atmospheres including the contemporary and prebiotic Earth. My approach aims to provide new input for models of atmospheric chemistry and climate, using fundamental chemical physics to address complex multiphase chemistry. Using solar simulators in laboratory studies, our group has been exploring the importance of water and the environment to the photochemistry of organic species involved in isoprene oxidation. Pyruvic acid is a small organic molecule found in the atmosphere in the gas phase, as well as in fogs, aerosols, and clouds. While the gas-phase photochemistry for pyruvic acid has been well-understood for decades, the sunlight- driven reaction pathways for the aqueous phase have remained more elusive. Our group has recently deduced a mechanism for the aqueous phase photolysis of pyruvic acid. This mechanism is not only fundamentally different from the gas-phase chemistry, but it is also dependent on the presence of oxygen in solution, highlighting the immense importance of water and the environment to photochemical processes.

Collaboration within CIRES allowed analysis of the importance of the aqueous phase photolysis of pyruvic acid in the atmosphere. Our laboratory measurements of the rate of the photochemical reaction in solution were used as input for an atmospheric model that compared the loss of pyruvic acid through aqueous photolysis to the loss from the gasphase photochemistry and oxidative processes. Results indicated that in an acidic environment, the aqueous photolysis is equally as important as the gas-phase photolysis, emphasizing the importance of developing a mechanistic understanding of aqueous- phase photochemical processes.

We have scaled the fundamental experimental work with pyruvic acid to realistic atmospheric conditions by using environmental chamber studies. Specifically we are using the CESAM (French acronym for Experimental Multiphasic Atmospheric Simulation Chamber) at the Université Paris–Est Créteil Val de Marne (UPEC) in collaboration with Professor Jean-François Doussin with UPEC. By combining these laboratory and chamber studies, we connect our understanding of the photolysis of pyruvic acid to mechanisms for aerosol nucleation and growth.

 


The Vaida Group and some current collaborators. Front row, left to right: Jay Kroll (Vaida Group), Allison Reed Harris (Vaida Group), and Rebecca Rapf (Vaida Group). Back Row, left to right: Pascal Renard (Aix-Marseille Université), Anne Monod (Aix-Marseille Université, CIRES 2013 Visiting Fellow), Russell Perkins (CIRES), Veronica Vaida, and Barbara Ervens (NOAA, CIRES). Photo credit: Jay A. Kroll/CIRES/CU Boulder


  • Fellow of the Alfred P. Sloan Foundation, 1981-83
  • Camille and Henrey Dreyfus Teacher-Scholar Award
  • Dr. Vaida is a professor at the University of Colorado at Boulder.

View Publications

  • Schroder, SD, JH Wallberg, JA Kroll, Z Maroun, V Vaida and HG Kjaergaard (2015), Intramolecular Hydrogen Bonding in Methyl Lactate. J. Phys. Chem. A Version: 1 119 (37) 9692-9702, issn: 1089-5639, ids: CS1ZL, doi: 10.1021/acs.jpca.5b04812, PubMed ID: 26296230
  • Griffith, EC, RJ Perkins, DM Telesford, EM Adams, L Cwiklik, HC Allen, M Roeseova and V Vaida (2015), Interaction of L-Phenylalanine with a Phospholipid Monolayer at the Water-Air Interface. J. Phys. Chem. B Version: 1 119 (29) 9038-9048, issn: 1520-6106, ids: CN7OM, doi: 10.1021/jp508473w, PubMed ID: 25549016
  • Griffith, EC, RJ Rapf, RK Shoemaker, BK Carpenter and V Vaida (2014), Photoinitiated Synthesis of Self-Assembled Vesicles. J. Am. Chem. Soc. Version: 1 136 (10) 3784-3787, issn: Feb-63, ids: AD0KJ, doi: 10.1021/ja5006256, PubMed ID: 24559493
  • Harris, AER, B Ervens, RK Shoemaker, JA Kroll, RJ Rapf, EC Griffith, A Monod and V Vaida (2014), Photochemical Kinetics of Pyruvic Acid in Aqueous Solution. J. Phys. Chem. A Version: 1 118 (37) 8505-8516, issn: 1089-5639, ids: AP5KV, doi: 10.1021/jp502186q, PubMed ID: 24725260
  • Vaida, V and DJ Donaldson (2014), Red-light initiated atmospheric reactions of vibrationally excited molecules. Phys. Chem. Chem. Phys. Version: 1 16 (3) 827-836, issn: 1463-9076, ids: 274ZE, doi: 10.1039/c3cp53543f, PubMed ID: 24281304
  • Renard, P, AER Harris, RJ Rapf, S Ravier, C Demelas, B Coulomb, E Quivet, V Vaida and A Monod (2014), Aqueous Phase Oligomerization of Methyl Vinyl Ketone by Atmospheric Radical Reactions. J. Phys. Chem. C Version: 1 118 (50) 29421-29430, issn: 1932-7447, ids: AX2FP, doi: 10.1021/jp5065598
  • Griffith, EC, BK Carpenter, RK Shoemaker and V Vaida (2013), Photochemistry of aqueous pyruvic acid. Proc. Natl. Acad. Sci. USA Version: 1 110 (29) 11714-11719, issn: 0027-8424, ids: 187AB, doi: 10.1073/pnas.1303206110, PubMed ID: 23821751
  • Kahan, TF, TK Ormond, GB Ellison and V Vaida (2013), Acetic acid formation via the hydration of gas-phase ketene under ambient conditions. Chem. Phys. Lett. Version: 1 565 1-4, issn: Sep-14, ids: 115EF, doi: 10.1016/j.cplett.2013.02.030
  • Griffith, EC, BK Carpenter, RK Shoemaker and V Vaida (2013), Reply to Eugene et al.: Photochemistry of aqueous pyruvic acid. Proc. Natl. Acad. Sci. USA Version: 1 110 (46) E4276-E4276, issn: 0027-8424, ids: 250DQ, doi: 10.1073/pnas.1316367110, PubMed ID: 24367807
  • Griffith, EC, TRC Guizado, AS Pimentel, GS Tyndall and V Vaida (2013), Oxidized Aromatic-Aliphatic Mixed Films at the Air-Aqueous Solution Interface. J. Phys. Chem. C Version: 1 117 (43) 22341-22350, issn: 1932-7447, ids: 247HJ, doi: 10.1021/jp402737n
  • Thomsen, DL, JL Axson, SD Schroder, JR Lane, V Vaida and HG Kjaergaard (2013), Intramolecular Interactions in 2-Aminoethanol and 3-Aminopropanol. J. Phys. Chem. A Version: 1 117 (40) 10260-10273, issn: 1089-5639, ids: 244DI, doi: 10.1021/jp405512y, PubMed ID: 24001040
  • Griffith, EC, RK Shoemaker and V Vaida (2013), Sunlight-initiated Chemistry of Aqueous Pyruvic Acid: Building Complexity in the Origin of Life. Orig. Life Evol. Biosph. Version: 1 43 (5-Apr) 341-352, issn: 0169-6149, ids: AD4FS, doi: 10.1007/s11084-013-9349-y, PubMed ID: 24362712
  • Griffith, EC and V Vaida (2013), Ionization state of L-Phenylalanine at the Air-Water Interface. J. Am. Chem. Soc. Version: 1 135 (2) 710-716, issn: Feb-63, ids: 075XP, doi: 10.1021/ja308089n, PubMed ID: 23240998
  • Larsen, MC and V Vaida (2012), Near Infrared Photochemistry of Pyruvic Acid in Aqueous Solution. J. Phys. Chem. A Version: 1 116 SI (24) 5840-5846, issn: 1089-5639, ids: 961DM, doi: 10.1021/jp2087972
  • Kahan, TF, RA Washenfelder, V Vaida and SS Brown (2012), Cavity-Enhanced Measurements of Hydrogen Peroxide Absorption Cross Sections from 353 to 410 nm. J. Phys. Chem. A Version: 1 116 (24) 5941-5947, issn: 1089-5639, ids: 961DM, doi: 10.1021/jp2104616, PubMed ID: 22225472
  • Griffith, EC, EM Adams, HC Allen and V Vaida (2012), Hydrophobic Collapse of a Stearic Acid Film by Adsorbed L-Phenylalanine at the Air-Water Interface. J. Phys. Chem. B Version: 1 116 (27) 7849-7857, issn: 1520-6106, ids: 972GB, doi: 10.1021/jp303913e, PubMed ID: 22691061
  • Griffith, EC and V Vaida (2012), In situ observation of peptide bond formation at the water-air interface. Proc. Natl. Acad. Sci. USA Version: 1 109 (39) 15697-15701, issn: 0027-8424, ids: 017QD, doi: 10.1073/pnas.1210029109, PubMed ID: 22927374
  • Kramer, ZC, K Takahashi, V Vaida and RT Skodje (2012), Will water act as a photocatalyst for cluster phase chemical reactions? Vibrational overtone-induced dehydration reaction of methanediol. J. Chem. Phys. Version: 1 136 (16) , issn: 0021-9606, ids: 936PJ, doi: 10.1063/1.4704767, PubMed ID: 22559477
  • Axson, JL, RA Washenfelder, TF Kahan, CJ Young, V Vaida and SS Brown (2011), Absolute ozone absorption cross section in the Huggins Chappuis minimum (350-470 nm) at 296 K. Atmos. Chem. Phys. Version: 1 11 (22) 11581-11590, issn: 1680-7316, ids: 863AC, doi: 10.5194/acp-11-11581-2011
  • Maron, MK, K Takahashi, RK Shoemaker and V Vaida (2011), Hydration of pyruvic acid to its geminal-diol, 2,2-dihydroxypropanoic acid, in a water-restricted environment. Chem. Phys. Lett. Version: 1 513 (6-Apr) 184-190, issn: Sep-14, ids: 814XW, doi: 10.1016/j.cplett.2011.07.090
  • Vaida, V (2011), Perspective: Water cluster mediated atmospheric chemistry. J. Chem. Phys. Version: 1 135 (2) , issn: 0021-9606, ids: 792UN, doi: 10.1063/1.3608919, PubMed ID: 21766916
  • Takahashi, K, KL Plath, JL Axson, GC Nelson, RT Skodje and V Vaida (2010), Dynamics and spectroscopy of vibrational overtone excited glyoxylic acid and 2,2-dihydroxyacetic acid in the gas-phase. J. Chem. Phys. Version: 1 132 (9) , issn: 0021-9606, ids: 564VG, doi: 10.1063/1.3327839, PubMed ID: 20210396
  • Axson, JL, K Takahashi, DO De Haan and V Vaida (2010), Gas-phase water-mediated equilibrium between methylglyoxal and its geminal diol. Proc. Natl. Acad. Sci. USA Version: 1 107 (15) 6687-6692, issn: 0027-8424, ids: 583AC, doi: 10.1073/pnas.0912121107, PubMed ID: 20142510
  • Donaldson, DJ, C George and V Vaida (2010), Red sky at night: Long-wavelength photochemistry in the atmosphere. Environ. Sci. Technol. Version: 1 44 (14) 5321-5326, issn: 0013-936X, ids: 623NF, doi: 10.1021/es903680v
  • Miller, BJ, M Yekutiel, AH Sodergren, DL Howard, ME Dunn, V Vaida and HG Kjaergaard (2010), Overtone Spectra of 2-Mercaptoethanol and 1,2-Ethanedithiol. J. Phys. Chem. A Version: 1 114 (48) 12692-12700, issn: 1089-5639, ids: 686YP, doi: 10.1021/jp9112798, PubMed ID: 21067132
  • Miller, BJ, DL Howard, JR Lane, HG Kjaergaard, ME Dunn and V Vaida (2009), SH-Stretching Vibrational Spectra of Ethanethiol and tert-Butylthiol. J. Phys. Chem. A Version: 1 113 (26) 7576-7583, issn: 1089-5639, ids: 462VG, doi: 10.1021/jp9017162, PubMed ID: 19432460
  • Maron, MK, MJ Shultz and V Vaida (2009), Characterization of the nitric acid-water complex in the infrared and near-infrared region at ambient temperatures in carbon tetrachloride. Chem. Phys. Lett. Version: 1 473 (6-Apr) 268-273, issn: Sep-14, ids: 443KM, doi: 10.1016/j.cplett.2009.03.071
  • Plath, KL, JL Axson, GC Nelson, K Takahashi, RT Skodje and V Vaida (2009), Gas-phase vibrational spectra of glyoxylic acid and its gem diol monohydrate. Implications for atmospheric chemistry. React. Kinet. Catal. Lett. Version: 1 96 (2) 209-224, issn: 0133-1736, ids: 443WW, doi: 10.1007/s11144-009-5528-2
  • Takahashi, K, KL Plath, RT Skodje and V Vaida (2008), Dynamics of vibrational overtone excited pyruvic acid in the gas phase: Line broadening through hydrogen-atom chattering. J. Phys. Chem. A Version: 1 112 (32) 7321-7331, issn: 1089-5639, ids: 335KT, doi: 10.1021/jp803225c, PubMed ID: 18637664
  • Rontu, N and V Vaida (2008), Vibrational spectroscopy of perfluorocarboxylic acids from the infrared to the visible regions. J. Phys. Chem. B Version: 1 112 (2) 276-282, issn: 1520-6106, ids: 250GE, doi: 10.1021/jp0749773, PubMed ID: 17927241
  • Lane, JR, V Vaida and HG Kjaergaard (2008), Calculated electronic transitions of the water ammonia complex. J. Chem. Phys. Version: 1 128 (3) , issn: 0021-9606, ids: 252UC, doi: 10.1063/1.2814163, PubMed ID: 18205493
  • Tuck, AF, DJ Donaldson, MH Hitchman, EC Richard, H Tervahattu, V Vaida and JC Wilson (2008), On geoengineering with sulphate aerosols in the tropical upper troposphere and lower stratosphere. Clim. Chang. Version: 1 90 (3) 315-331, issn: 0165-0009, ids: 348BU, doi: 10.1007/s10584-008-9411-3
  • Rontu, N and V Vaida (2007), Surface partitioning and stability of pure and mixed films of 8-2 fluorotelomer alcohol at the air-water interface. J. Phys. Chem. C Version: 1 111 (31) 11612-11618, issn: 1932-7447, ids: 196LF, doi: 10.1021/jp070484m
  • Miller, Y, RB Gerber and V Vaida (2007), Photodissociation yields for vibrationally excited states of sulfuric acid under atmospheric conditions. Geophys. Res. Lett. Version: 1 34 (16) , issn: 0094-8276, ids: 204FD, doi: 10.1029/2007GL030529
  • Lane, JR, HG Kjaergaard, KL Plath and V Vaida (2007), Overtone spectroscopy of sulfonic acid derivatives. J. Phys. Chem. A Version: 1 111 (25) 5434-5440, issn: 1089-5639, ids: 180VV, doi: 10.1021/jp0688005, PubMed ID: 17542563
  • Rontu, N and V Vaida (2007), Miscibility of perfluorododecanoic acid with organic acids at the air-water interface. J. Phys. Chem. C Version: 1 111 (27) 9975-9980, issn: 1932-7447, ids: 186EN, doi: 10.1021/jp0718395
  • Takahashi, K, ZC Kramer, V Vaida and RT Skodje (2007), Vibrational overtone induced elimination reactions within hydrogen-bonded molecular clusters: the dynamics of water catalyzed reactions in CH2FOH center dot(H2O). Phys. Chem. Chem. Phys. Version: 1 9 (29) 3864-3871, issn: 1463-9076, ids: 191AN, doi: 10.1039/b705264b, PubMed ID: 17637978
  • Havey, DK, KJ Feierabend, K Takahashi, RT Skodje and V Vaida (2006), Experimental and theoretical investigation of vibrational overtones of glycolic acid and its hydrogen bonding interactions with water. J. Phys. Chem. A Version: 1 110 (20) 6439-6446, issn: 1089-5639, ids: 043TW, doi: 10.1021/jp060602q, PubMed ID: 16706399
  • Feierabend, KJ, DK Havey, SS Brown and V Vaida (2006), Experimental absolute intensities of the 4v(9) and 5v(9) O-H stretching overtones of H2SO4. Chem. Phys. Lett. Version: 1 420 (6-Apr) 438-442, issn: Sep-14, ids: 026CC, doi: 10.1029/2007GL030529
  • Gilman, JB and V Vaida (2006), Permeability of acetic acid through organic films at the air-aqueous interface. J. Phys. Chem. A Version: 1 110 (24) 7581-7587, issn: 1089-5639, ids: 053DH, doi: 10.1021/jp061220n, PubMed ID: 16774200
  • Rontu, N and V Vaida (2006), Vibrational spectroscopy of perfluoroproplonic acid in the region between 1000 and 11000 cm(-1). J. Mol. Spectrosc. Version: 1 237 (1) 19-26, issn: 0022-2852, ids: 045LO, doi: 10.1016/j.jms.2006.02.009
  • Feierabend, KJ, DK Havey, ME Varner, JF Stanton and V Vaida (2006), A comparison of experimental and calculated spectra of HNO3 in the near-infrared using Fourier transform infrared spectroscopy and vibrational perturbation theory. J. Chem. Phys. Version: 1 124 (12) , issn: 0021-9606, ids: 028CP, doi: 10.1063/1.2180248, PubMed ID: 16599690
  • Gilman, JB, H Tervahattu and V Vaida (2006), Interfacial properties of mixed films of long-chain organics at the air-water interface. Atmos. Environ. Version: 1 40 (34) 6606-6614, issn: 1352-2310, ids: 102BC, doi: 10.1016/j.atmosenv.2006.05.052
  • Havey, DK, KJ Feierabend, JC Black and V Vaida (2005), Temperature-dependent infrared spectra of torsional vibrations in acetic acid. J. Mol. Spectrosc. Version: 1 229 (2) 151-157, issn: 0022-2852, ids: 887FV, doi: 10.1016/j.jms.2004.09.009
  • Eliason, TL, DK Havey and V Vaida (2005), Gas phase infrared spectroscopic observation of the organic acid dimers (CH3(CH2)(6)COOH)(2), (CH3(CH2)(7)COOH)(2), and (CH3(CH2)(8)COOH)(2). Chem. Phys. Lett. Version: 1 402 (3-Jan) 239-244, issn: Sep-14, ids: 889YX, doi: 10.1016/j.cplett.2004.12.021
  • Tervahattu, H, J Juhanoja, V Vaida, AF Tuck, JV Niemi, K Kupiainen, M Kulmala and H Vehkamaki (2005), Fatty acids on continental sulfate aerosol particles. J. Geophys. Res-Atmos. Version: 1 110 (D6) , issn: 2169-897X, ids: 913LS, doi: 10.1029/2004JD005400
  • Hintze, PE, KJ Feierabend, DK Havey and V Vaida (2005), High-resolution spectroscopy of H2SO4, HDSO4, and D2SO4 vapor in the region 1200-10,000 cm(-1). Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. Version: 1 61 (4) 559-566, issn: 1386-1425, ids: 892ZT, doi: 10.1016/j.saa.2004.05.006, PubMed ID: 15649784
  • Mills, MJ, OB Toon, V Vaida, PE Hintze, HG Kjaergaard, DP Schofield and TW Robinson (2005), Photolysis of sulfuric acid vapor by visible light as a source of the polar stratospheric CN layer. J. Geophys. Res-Atmos. Version: 1 110 (D8) , issn: 2169-897X, ids: 922QG, doi: 10.1029/2004JD005519
  • Havey, DK, KJ Feierabend and V Vaida (2004), Vapor-phase vibrational spectrum of glycolic acid, CH2OHCOOH, in the region 2000-8500 cm(-1). J. Phys. Chem. A Version: 1 108 (42) 9069-9073, issn: 1089-5639, ids: 863CU, doi: 10.1021/jp0474881
  • Donaldson, DJ, H Tervahattu, AF Tuck and V Vaida (2004), Organic aerosols and the origin of life: An hypothesis. Orig. Life Evol. Biosph. Version: 1 34 (2-Jan) 57-67, issn: 0169-6149, ids: 756ZX, doi: 10.1023/B:ORIG.0000009828.40846.b3
  • Eliason, TL, JB Gilman and V Vaida (2004), Oxidation of organic films relevant to atmospheric aerosols. Atmos. Environ. Version: 1 38 (9) 1367-1378, issn: 1352-2310, ids: 776DT, doi: 10.1016/j.atmosenv.2003.11.025
  • Gilman, JB, TL Eliason, A Fast and V Vaida (2004), Selectivity and stability of organic films at the air-aqueous interface. J. Colloid Interface Sci. Version: 1 280 (1) 234-243, issn: 0021-9797, ids: 872TP, doi: 10.1016/j.jcis.2004.07.019
  • Havey, DK and V Vaida (2004), Near infrared spectroscopy of organic acids: comparing O-H and C-H oscillator frequencies and intensities. J. Mol. Spectrosc. Version: 1 228 (1) 152-159, issn: 0022-2852, ids: 866KY, doi: 10.1016/j.jms.2004.07.015
  • Mmereki, BT, DJ Donaldson, JB Gilman, TL Eliason and V Vaida (2004), Kinetics and products of the reaction of gas-phase ozone with anthracene adsorbed at the air-aqueous interface. Atmos. Environ. Version: 1 38 (36) 6091-6103, issn: 1352-2310, ids: 869US, doi: 10.1016/j.atmosenv.2004.08.014
  • Feierabend, KJ, DK Havey and V Vaida (2004), Gas phase spectroscopy of HNO3 in the region 2000-8500 cm(-1). Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. Version: 1 60 (12) 2775-2781, issn: 1386-1425, ids: 856MV, doi: 10.1016/j.saa.2004.01.016, PubMed ID: 15350912
  • Havey, DK, KJ Feierabend and V Vaida (2004), Ab initio study of H2SO4 rotamers. Theochem-J. Mol. Struct. Version: 1 680 (3-Jan) 243-247, issn: 0166-1280, ids: 837UP, doi: 10.1016/j.theochem.2004.04.048
  • Vaida, V, HG Kjaergaard, PE Hintze and DJ Donaldson (2003), Photolysis of sulfuric acid vapor by visible solar radiation. Science Version: 1 299 (5612) 1566-1568, issn: 0036-8075, ids: 652EY, doi: 10.1126/science.1079297, PubMed ID: 12624265
  • Kjaergaard, HG, TW Robinson, DL Howard, JS Daniel, JE Headrick and V Vaida (2003), Complexes of importance to the absorption of solar radiation. J. Phys. Chem. A Version: 1 107 (49) 10680-10686, issn: 1089-5639, ids: 750QX, doi: 10.1021/jp035098t
  • Eliason, TL, S Aloisio, DJ Donaldson, DJ Cziczo and V Vaida (2003), Processing of unsaturated organic acid films and aerosols by ozone. Atmos. Environ. Version: 1 37 (16) 2207-2219, issn: 1352-2310, ids: 676XY, doi: 10.1016/S1352-2310(03)00149-3
  • Hintze, PE, HG Kjaergaard, V Vaida and JB Burkholder (2003), Vibrational and electronic spectroscopy of sulfuric acid vapor. J. Phys. Chem. A Version: 1 107 (8) 1112-1118, issn: 1089-5639, ids: 648HW, doi: 10.1021/jp0263626
  • Donaldson, DJ, AF Tuck and V Vaida (2002), The asymmetry of organic aerosol fission and prebiotic chemistry. Orig. Life Evol. Biosph. Version: 1 32 (3) 237-245, issn: 0169-6149, ids: 576MH, doi: 10.1023/A:1016575224538
  • Tervahattu, H, K Hartonen, VM Kerminen, K Kupiainen, P Aarnio, T Koskentalo, AF Tuck and V Vaida (2002), New evidence of an organic layer on marine aerosols. J. Geophys. Res-Atmos. Version: 1 107 (D7-8) , Art. No. 4053, issn: 0747-7309, ids: 609FY, doi: 10.1029/2000JD000282
  • Aloisio, S, PE Hintze and V Vaida (2002), The hydration of formic acid. J. Phys. Chem. A Version: 1 106 (2) 363-370, issn: 1089-5639, ids: 513AN, doi: 10.1021/jp012190l
  • Goss, LH, V Vaida, JW Brault and RT Skodje (2001), Sequential two-photon dissociation of atmospheric water. J. Phys. Chem. A Version: 1 105 (1) 70-75, issn: 1089-5639, ids: 390XF, doi: 10.1021/jp001828a
  • Vaida, V, JS Daniel, HG Kjaergaard, LM Goss and AF Tuck (2001), Atmospheric absorption of near infrared and visible solar radiation by the hydrogen bonded water dimer. Q. J. Roy Meteorol. Soc. Version: 1 127 (575) 1627-1643, issn: 0035-9009, ids: 461YH, doi: 10.1256/smsqj.57508
  • Hintze, PE, S Aloisio and V Vaida (2001), Electronic spectroscopy of organic acid dimers. Chem. Phys. Lett. Version: 1 343 (2-Jan) 159-165, issn: Sep-14, ids: 457NT
  • Donaldson, DJ, AF Tuck and V Vaida (2001), Spontaneous fission of atmospheric aerosol particles. Phys. Chem. Chem. Phys. Version: 1 3 (23) 5270-5273, issn: 1463-9076, ids: 496UB, doi: 10.1039/b105215m
  • Dobson, CM, GB Ellison, AF Tuck and V Vaida (2000), Atmospheric aerosols as prebiotic chemical reactors. Proc. Natl. Acad. Sci. USA Version: 1 97 (22) 11864-11868, issn: 0027-8424, ids: 367PQ, doi: 10.1073/pnas.200366897
  • Donaldson, DJ, AF Tuck and V Vaida (2000), Enhancement of HOx at high solar zenith angles by overtone-induced dissociation of HNO3 and HNO4. Phys. Chem. Earth Pt. C-Solar-Terr. Planet. Sci. Version: 1 25 (3) 223-227, issn: 1464-1917, ids: 296WX, doi: 10.1016/S1464-1917(00)00009-X
  • Evans, GT and V Vaida (2000), Aggregation of water molecules: Atmospheric implications. J. Chem. Phys. Version: 1 113 (16) 6652-6659, issn: 0021-9606, ids: 368RL, doi: 10.1063/1.1310601
  • Vaida, V, AF Tuck and GB Ellison (2000), Optical and chemical properties of atmospheric organic aerosols. Phys. Chem. Earth Pt. C-Solar-Terr. Planet. Sci. Version: 1 25 (3) 195-198, issn: 1464-1917, ids: 296WX, doi: 10.1016/S1464-1917(00)00005-2
  • Wennberg, PO, RJ Salawitch, DJ Donaldson, TF Hanisco, EJ Lanzendorf, KK Perkins, SA Lloyd, V Vaida, RS Gao, EJ Hintsa, RC Cohen, WH Swartz, TL Kusterer and DE Anderson (1999), Twilight observations suggest unknown sources of HOx. Geophys. Res. Lett. Version: 1 26 (10) 1373-1376, issn: 0094-8276, ids: 197PR, doi: 10.1029/1999GL900255
  • Frost, GJ, GB Ellison and V Vaida (1999), Organic peroxyl radical photolysis in the near-infrared: Effects on tropospheric chemistry. J. Phys. Chem. A Version: 1 103 (49) 10169-10178, issn: 1089-5639, ids: 266UM, doi: 10.1021/jp9917547
  • Goss, LM, SW Sharpe, TA Blake, V Vaida and JW Brault (1999), Direct absorption spectroscopy of water clusters. J. Phys. Chem. A Version: 1 103 (43) 8620-8624, issn: 1089-5639, ids: 253CB, doi: 10.1021/jp9920702
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