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Silva AJFWHDS, Rodrigues GP, Ventura E, do Monte SA. Photodissociation and formation of an ion-pair in CH 2 FCl (HCFC-31). J Comput Chem 2024; 45:476-486. [PMID: 37950575 DOI: 10.1002/jcc.27257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 10/30/2023] [Accepted: 11/01/2023] [Indexed: 11/12/2023]
Abstract
Although CH2 FCl (HCFC-31) recently became of great atmospheric importance, studies concerning its excited states are almost nonexistent. Several excited singlet states were studied (valence nσ* and Rydberg n3s, n3p, σ3s, and σ3p) through highly correlated multireference configuration interaction with singles and doubles, including extensivity correction. Comparison with the states of CH3 Cl indicates a strong influence of the F atom. Potential energy curves suggest formation of an electrostatically bound complex that relaxes to a hydrogen-bonded contact ion-pair (HBCIP) which can decay yielding CH2 F + Cl or to the ground state minimum of CH2 FCl. The HBCIP has a dipole moment of 9.57 D, a CI wavefunction described as 0.65ionic + 0.20biradical and it is strongly bonded by 4.72 eV. Its H bond has characteristics of moderate and strong H bonds. The simulated absorption spectrum confirms the nσ* assignment for the first and suggests the n3s + n3pσ assignment for the second band.
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Affiliation(s)
| | | | - Elizete Ventura
- Chemistry Department, Universidade Federal da Paraíba, Joao Pessoa, Brazil
| | - Silmar A do Monte
- Chemistry Department, Universidade Federal da Paraíba, Joao Pessoa, Brazil
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2
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Hydrogen-bonded contact ion pair in gaseous chloroethane: a multi-reference configuration interaction with singles and doubles (MR-CISD) study including extensivity corrections. Theor Chem Acc 2020. [DOI: 10.1007/s00214-020-2561-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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3
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He Y, Zhang J, Kong W. Electron impact ionization and multiphoton ionization of doped superfluid helium droplets: A comparison. J Chem Phys 2016; 144:084302. [PMID: 26931697 DOI: 10.1063/1.4942473] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We compare characteristics of electron impact ionization (EI) and multiphoton ionization (MPI) of doped superfluid helium droplets using the same droplet source. Selected dopant ion fragments from the two ionization schemes demonstrate different dependence on the doping pressure, which could be attributed to the different ionization mechanisms. While EI directly ionizes helium atoms in a droplet therefore has higher yields for bigger droplets (within a limited size range), MPI is insensitive to the helium in a droplet and is only dependent on the number of dopant molecules. The optimal timing of the ionization pulse also varies with the doping pressure, implying a velocity slip among different sized droplets. Calculations of the doping statistics and ionization probabilities qualitatively agree with the experimental data. Our results offer a word of caution in interpreting the pressure and timing dependence of superfluid helium droplets, and we also devise a scheme in achieving a high degree of doping while limiting the contribution of dopant clusters.
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Affiliation(s)
- Yunteng He
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Jie Zhang
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
| | - Wei Kong
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA
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Rodrigues GP, Ventura E, Andrade do Monte S, Barbatti M. UV-photoexcitation and ultrafast dynamics of HCFC-132b (CF2ClCH2Cl). J Comput Chem 2015; 37:675-83. [DOI: 10.1002/jcc.24260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 11/10/2015] [Accepted: 11/11/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Gessenildo Pereira Rodrigues
- Universidade Federal da Paraiba; João Pessoa-PB 58059-900 Brazil
- Max-Planck-Institut Für Kohlenforschung; Kaiser-Wilhelm-Platz 1, 45470 Mülheim an Der Ruhr Germany
| | - Elizete Ventura
- Universidade Federal da Paraiba; João Pessoa-PB 58059-900 Brazil
| | | | - Mario Barbatti
- Max-Planck-Institut Für Kohlenforschung; Kaiser-Wilhelm-Platz 1, 45470 Mülheim an Der Ruhr Germany
- Aix Marseille Université, CNRS; ICR UMR7273, 13397 Marseille France
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5
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Ross A, Sharp PR. Trans-(P(OPh)3)2(CO)IrX (X = Cl and Br): When changing chloro to bromo doesn't make much difference. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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6
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Pereira Rodrigues G, Ventura E, do Monte SA, Barbatti M. Photochemical Deactivation Process of HCFC-133a (C2H2F3Cl): A Nonadiabatic Dynamics Study. J Phys Chem A 2014; 118:12041-9. [DOI: 10.1021/jp507681g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gessenildo Pereira Rodrigues
- Universidade Federal da Paraiba, 58059-900, João Pessoa-Paraíba, Brazil
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Elizete Ventura
- Universidade Federal da Paraiba, 58059-900, João Pessoa-Paraíba, Brazil
| | | | - Mario Barbatti
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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7
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Bai F, Sun Y, Wang X, Jia Z, Wang R, Pan X. Theoretical investigation of the mechanisms and dynamics of the reaction CHF2OCF 2CHFCl+Cl. J Mol Model 2014; 20:2419. [PMID: 25129661 DOI: 10.1007/s00894-014-2419-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Accepted: 07/16/2014] [Indexed: 11/28/2022]
Abstract
The reaction of CHF2OCF2CHFCl with atomic chlorine was studied using B3LYP/6-311G(d,p), BHandHLYP/6-311G(d,p), and M06-2X/6-311G(d,p) methods and further using CCSD(T) and QCISD(T) methods. Two hydrogen abstraction channels were found for the title reaction. Dynamics calculations were followed by means of canonical variational transition state with the small-curvature tunneling correction between 220 and 2,000 K. Our rate constant k = 2.90 × 10(-15) cm(3) molecule(-1) s(-1) is in reasonable agreement with the available data (3.20 ± 0.32) × 10(-15) cm(3) molecule(-1) s(-1) at 296 K. The three-parameter Arrhenius expression (in the unit of cm(3) molecule(-1) s(-1)) for the title reaction is given as k (T) = 1.38 × 10 (-19) T (2.57) exp (-2622.95/T).
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Affiliation(s)
- Fengyang Bai
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
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Rodrigues GP, Lucena JR, Ventura E, do Monte SA, Reva I, Fausto R. Matrix isolation infrared spectroscopic and theoretical study of 1,1,1-trifluoro-2-chloroethane (HCFC-133a). J Chem Phys 2013; 139:204302. [PMID: 24289349 DOI: 10.1063/1.4832376] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The molecular structure and infrared spectrum of the atmospheric pollutant 1,1,1-trifluoro-2-chloroethane (HCFC-133a; CF3CH2Cl) in the ground electronic state were characterized experimentally and theoretically. Excited state calculations (at the CASSCF, MR-CISD, and MR-CISD+Q levels) have also been performed in the range up to ~9.8 eV. The theoretical calculations show the existence of one (staggered) conformer, which has been identified spectroscopically for the monomeric compound isolated in cryogenic (~10 K) argon and xenon matrices. The observed infrared spectra of the matrix-isolated HCFC-133a were interpreted with the aid of MP2/aug-cc-pVTZ calculations and normal coordinate analysis, which allowed a detailed assignment of the observed spectra to be carried out, including identification of bands due to different isotopologues ((35)Cl and (37)Cl containing molecules). The calculated energies of the several excited states along with the values of oscillator strengths and previous results obtained for CFCs and HCFCs suggest that the previously reported photolyses of the title compound at 147 and 123.6 nm [T. Ichimura, A. W. Kirk, and E. Tschuikow-Roux, J. Phys. Chem. 81, 1153 (1977)] are likely to be initiated in the n-4s and n-4p Rydberg states, respectively.
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Wang L, Li Y, He H, Zhang J. Hydrogen abstraction reactions of OH radicals with CH3CH2CH2Cl and CH3CHClCH3: A mechanistic and kinetic study. J Comput Chem 2011; 33:66-75. [DOI: 10.1002/jcc.21944] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 07/22/2011] [Accepted: 08/16/2011] [Indexed: 11/06/2022]
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Dowben PA, Grunze M. Interaction of CFCl3 with an Fe(100) Surface Part I: Adsorption and X-Ray Induced Effects at 90 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19810850802] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Rajappan M, Büttner M, Cox C, Yates JT. Photochemical decomposition of N2O by Lyman-alpha radiation: scientific basis for a chemical actinometer. J Phys Chem A 2010; 114:3443-8. [PMID: 20155946 DOI: 10.1021/jp9093436] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel IR method for measuring the kinetics of N(2)O photodecomposition has been devised and used to calibrate the flux of Lyman-alpha (10.2 eV) radiation from a H(2)/Ar microwave discharge lamp. The photodecomposition of N(2)O occurs with a weak pressure dependence due to the operation of a wall effect consuming some photogenerated active oxygen species. This effect is removed by working at high N(2)O pressures. The Lyman-alpha flux from the lamp is 1.28 +/- 0.36 x 10(15) photons cm(-2) s(-1).
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Affiliation(s)
- Mahesh Rajappan
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, USA
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Comparative study of the dissociative ionization of 1,1,1-trichloroethane using nanosecond and femtosecond laser pulses. Int J Mol Sci 2010; 11:1114-40. [PMID: 20480004 PMCID: PMC2869235 DOI: 10.3390/ijms11031114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 02/25/2010] [Accepted: 02/26/2010] [Indexed: 11/22/2022] Open
Abstract
Changes in the laser induced molecular dissociation of 1,1,1-trichloroethane (TCE) were studied using a range of intensities and standard laser wavelengths with nanosecond and femtosecond pulse durations. TCE contains C-H, C-C and C-Cl bonds and selective bond breakage of one or more of these bonds is of scientific interest. Using laser ionization time of flight mass spectrometry, it was found that considerable variation of fragment ion peak heights as well as changes in relative peak ratios is possible by varying the laser intensity (by attenuation), wavelength and pulse duration using standard laser sources. The nanosecond laser dissociation seems to occur via C-Cl bond breakage, with significant fragmentation and only a few large mass ion peaks observed. In contrast, femtosecond laser dissociative ionization results in many large mass ion peaks. Evidence is found for various competing dissociation and ionization pathways. Variation of the nanosecond laser intensity does not change the fragmentation pattern, while at high femtosecond intensities large changes are observed in relative ion peak sizes. The total ionization yield and fragmentation ratios are presented for a range of wavelengths and intensities, and compared to the changes observed due to a linear chirp variation.
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13
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Storrie-Lombardi MC, Muller JP, Fisk MR, Cousins C, Sattler B, Griffiths AD, Coates AJ. Laser-Induced Fluorescence Emission (L.I.F.E.): searching for Mars organics with a UV-enhanced PanCam. ASTROBIOLOGY 2009; 9:953-964. [PMID: 20041748 DOI: 10.1089/ast.2009.0353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The European Space Agency will launch the ExoMars mission in 2016 with a primary goal of surveying the martian subsurface for evidence of organic material. We have recently investigated the utility of including either a 365 nm light-emitting diode or a 375 nm laser light source in the ExoMars rover panoramic camera (PanCam). Such a modification would make it feasible to monitor rover drill cuttings optically for the fluorescence signatures of aromatic organic molecules and map the distribution of polycyclic aromatic hydrocarbons (PAHs) as a function of depth to the 2 m limit of the ExoMars drill. The technique described requires no sample preparation, does not consume irreplaceable resources, and would allow mission control to prioritize deployment of organic detection experiments that require sample destruction, expenditure of non-replaceable consumables, or both. We report here for the first time laser-induced fluorescence emission (L.I.F.E.) imaging detection limits for anthracene, pyrene, and perylene targets doped onto a Mars analog granular peridotite with a 375 nm Nichia laser diode in optically uncorrected wide-angle mode. Data were collected via the Beagle 2 PanCam backup filter wheel fitted with original blue (440 nm), green (530 nm), and red (670 nm) filters. All three PAH species can be detected with the PanCam green (530 nm) filter. Detection limits in the green band for signal-to-noise ratios (S/N) > 10 are 49 parts per million (ppm) for anthracene, 145 ppm for pyrene, and 20 ppm for perylene. The anthracene detection limit improves to 7 ppm with use of the PanCam blue filter. We discuss soil-dependent detection limit constraints; use of UV excitation with other rover cameras, which provides higher spatial resolution; and the advantages of focused and wide-angle laser modes. Finally, we discuss application of L.I.F.E. techniques at multiple wavelengths for exploration of Mars analog extreme environments on Earth, including Icelandic hydrothermally altered basalts and the ice-covered lakes and glaciers of Dronning Maud Land, Antarctica.
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14
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Romanzin C, Gans B, Douin S, Boyé-Péronne S, Gauyacq D. 193nm photolysis of CHCl3: Probe of the CH product by CRDS. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.03.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Alapi T, Dombi A. Direct VUV photolysis of chlorinated methanes and their mixtures in an oxygen stream using an ozone producing low-pressure mercury vapour lamp. CHEMOSPHERE 2007; 67:693-701. [PMID: 17166560 DOI: 10.1016/j.chemosphere.2006.10.066] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2006] [Revised: 10/28/2006] [Accepted: 10/30/2006] [Indexed: 05/13/2023]
Abstract
The gas-phase photooxidations of CCl(4), CHCl(3), CH(2)Cl(2) and their binary mixtures in an O(2) stream were studied in a flow reactor under various experimental conditions using a low-pressure mercury lamp as light source covered with a high-purity silica sleeve being used. The 184.9 nm VUV irradiation emitted is responsible for the Cl-C bond rupture in the chlorinated methanes and for the formation of O(3) from O(2). The rate of degradation of H-containing chlorinated methanes increased sharply on increase of their initial concentrations, most probably of a (*)Cl chain reaction, as indicated by the increase in the molar ratio of the amount of HCl formed to the amount of H-containing target substance decomposed. The experimental results suggested that the further transformations of the radicals and products formed play an important role as (*)Cl sources, causing a considerably higher rate of decomposition of the H-containing target substances. In a humidified O(2) stream, the (*)OH formed opens up another route for oxidation of the target substances. Thus, the rates of degradation of CH(2)Cl(2) and CHCl(3) increased on increase of the relative humidity, whereas the water vapour had no effect at all on the decomposition of CCl(4). At the same time, competition occurs between (*)Cl or (*)OH for reactions with the target substance. The photooxidation of binary mixtures was investigated too. The addition of CCl(4) or CHCl(3) to CH(2)Cl(2) strongly increased its degradation rate. The addition of CH(2)Cl(2) did not have a considerable effect on the rate of degradation of CHCl(3).
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Affiliation(s)
- T Alapi
- Department of Inorganic and Analytical Chemistry, University of Szeged, P.O. Box 440, H-6701 Szeged, Hungary
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Alapi T, Van Craeynest K, Van Langenhoeve H, Dewulf J, Dombi A. Direct VUV photolysis of chlorinated methanes and their mixtures in a nitrogen stream. CHEMOSPHERE 2007; 66:139-44. [PMID: 16774775 DOI: 10.1016/j.chemosphere.2006.04.090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2006] [Revised: 04/27/2006] [Accepted: 04/28/2006] [Indexed: 05/10/2023]
Abstract
The gas-phase decomposition of CCl(4), CHCl(3) and CH(2)Cl(2) and their binary mixtures was studied in a flow-type reactor in a nitrogen gas stream, using a low-pressure mercury vapour lamp covered with a high-purity silica quartz sleeve. The 184.9 nm vacuum-ultraviolet (VUV) light emitted is able to rupture the C-Cl bond in these target substances. For H-containing compounds, the decomposition takes place not only by direct photolysis, but also by H abstraction by .Cl formed during the direct photolysis of the target substances. The relative contributions of direct photolysis and .Cl-sensitized reactions to the decomposition were estimated at different initial concentrations. The addition of CCl(4) to CHCl(3) or CH(2)Cl(2) increased their decomposition rates via increase of the .Cl concentration, whereas the addition of CH(2)Cl(2) to CHCl(3) decreased its degradation rate, suggesting that CH(2)Cl(2) acts as a .Cl radical scavenger. The variation of the product distribution confirms the effect of the composition of the irradiated gas mixtures on the relative contributions of .Cl-sensitized reactions and direct photolysis.
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Affiliation(s)
- T Alapi
- Department of Inorganic and Analytical Chemistry, University of Szeged, P.O. Box 440, H-6701 Szeged, Hungary
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19
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Medvedev IR, Behnke M, De Lucia FC. Chemical analysis in the submillimetre spectral region with a compact solid state system. Analyst 2006; 131:1299-307. [PMID: 17124537 DOI: 10.1039/b605917a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new analytical system that uses the rotational signatures of gas phase molecules is described and demonstrated. It uses a solid state source to probe molecular systems in the millimetre and submillimetre wave range, the only region of the electromagnetic spectrum not yet used extensively for analytical purposes. It employs the FAst Scan Submillimetre Spectroscopy Technique (FASSST), which leads to an especially simple system architecture. Among the attributes of the system are generality, sensitivity, 'absolute' specificity, small size, simplicity, and the potential for very low cost. Applications to problems of analytical interest are also discussed.
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Affiliation(s)
- Ivan R Medvedev
- Department of Physics, The Ohio State University, Columbus, OH 43210, USA
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20
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Mohseni M. Gas phase trichloroethylene (TCE) photooxidation and byproduct formation: photolysis vs. titania/silica based photocatalysis. CHEMOSPHERE 2005; 59:335-342. [PMID: 15763086 DOI: 10.1016/j.chemosphere.2004.10.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2004] [Revised: 10/07/2004] [Accepted: 10/19/2004] [Indexed: 05/24/2023]
Abstract
Photooxidation of trichloroethylene (TCE) was examined in comparative study using photolysis and photocatalysis. Degussa P25 titania coated on reactor wall and deposited on silica based microporous support were used as photocatalyst. The destruction of TCE and formation of potential byproducts were investigated under steady state conditions using annular photoreactors. Experimental work involved passing polluted air containing TCE through the UV photoreactor at varying concentrations and residence times. Ultraviolet illumination was provided by low pressure mercury lamps with outputs at either 254 nm, 365 nm, or 185/254 nm. Silica supported photocatalyst yielded maximum removal capacity of up to about 6 kg TCE per m3 per hour, nearly twice that provided by the coated titania. Direct photolysis with ozone generating UV also provided very high TCE conversion of up to 6kg TCE per m3 per hour. However, major quantities of phosgene and dichloroacetyle chloride (DCAC) were produced as byproducts. TCE removal using silica based photocatalyst did not result in any detectable DCAC. Only phosgene along with trace amounts of chloroform and carbon tetrachloride were identified as oxidation byproducts with silica based photocatalyst.
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Affiliation(s)
- Madjid Mohseni
- Department of Chemical and Biological Engineering, University of British Columbia, 2216 Main Mall, Vancouver, BC, Canada V6T 1Z4.
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Marom R, Golan A, Rosenwaks S, Bar I. Intramolecular Dynamics in the Photofragmentation of Initially Vibrationally Excited CH2Cl2. J Phys Chem A 2004. [DOI: 10.1021/jp049217w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ran Marom
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Amir Golan
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Salman Rosenwaks
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Ilana Bar
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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Krisch MJ, McCunn LR, Takematsu K, Butler LJ, Blase FR, Shu J. Photodissociation of CH3OCl to CH3O + Cl at 248 nm. J Phys Chem A 2004. [DOI: 10.1021/jp0372082] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. J. Krisch
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - L. R. McCunn
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - K. Takematsu
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - L. J. Butler
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - F. R. Blase
- Haverford College, Department of Chemistry, Haverford, Pennsylvania 19041
| | - J. Shu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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Marom R, Golan A, Rosenwaks S, Bar I. Photodissociation dynamics of vibrationally excited CH2Cl2 molecules. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.07.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Feiyan C, Pehkonen SO, Ray MB. Kinetics and mechanisms of UV-photodegradation of chlorinated organics in the gas phase. WATER RESEARCH 2002; 36:4203-4214. [PMID: 12420925 DOI: 10.1016/s0043-1354(02)00140-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Over the last two decades, the application of photodegradation for the destruction of a wide spectrum of organic compounds in air has gained considerable interest in abating environmental pollution. This paper presents the results of a fundamental study conducted to evaluate the gas phase oxidation kinetics of volatile organic compounds (VOCs) with respect to different parameters pertinent to the operating conditions of air stripping and soil vapor extraction processes. Photodegradations of three chlorinated VOCs: chloroform, carbon tetrachloride (CTC) and trichloroethylene (TCE), were investigated in a semi-batch reactor using a low-pressure mercury UV lamp. The effects of different experimental parameters, such as the initial concentrations of the VOCs, the reaction medium, relative humidity, light intensity, temperature and the effect of mixture that may influence the kinetics of the gas phase photodegradation were evaluated. Mechanisms of photodegradation as supported by the experimental data are also proposed.
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Affiliation(s)
- Chen Feiyan
- Department of Chemical and Environmental Engineering, National University of Singapore, Singapore
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26
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Johnson MS, Billing GD, Gruodis A, Janssen MHM. Photolysis of Nitrous Oxide Isotopomers Studied by Time-Dependent Hermite Propagation. J Phys Chem A 2001. [DOI: 10.1021/jp011449x] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew S. Johnson
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, Department of General Physics and Spectroscopy, University of Vilnius, Sauletekio 9, b. 3, 2040 Vilnius, Lithuania, and Laser Centre and Department of Chemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Gert Due Billing
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, Department of General Physics and Spectroscopy, University of Vilnius, Sauletekio 9, b. 3, 2040 Vilnius, Lithuania, and Laser Centre and Department of Chemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Alytis Gruodis
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, Department of General Physics and Spectroscopy, University of Vilnius, Sauletekio 9, b. 3, 2040 Vilnius, Lithuania, and Laser Centre and Department of Chemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Maurice H. M. Janssen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, Department of General Physics and Spectroscopy, University of Vilnius, Sauletekio 9, b. 3, 2040 Vilnius, Lithuania, and Laser Centre and Department of Chemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Brownsword RA, Schmiechen P, Volpp HR, Upadhyaya HP, Jung YJ, Jung KH. Chlorine atom formation dynamics in the dissociation of CH3CF2Cl(HCFC-142b) after UV laser photoexcitation. J Chem Phys 1999. [DOI: 10.1063/1.479124] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Ardelt D, Stuhl F. Two-photon photolysis of CF3Cl at 10.5 eV: determination of the Cl*/Cl spin–orbit branching ratio and the formation of electronically excited CF3*. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00303-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ho GH, Lin MS, Wang YL, Chang TW. Photoabsorption and photoionization of propyne. J Chem Phys 1998. [DOI: 10.1063/1.477209] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fragment ion yields from CFCl3 photoexcited in regions of the Cl2p, the C1s, and the F1s electron transitions. Chem Phys 1998. [DOI: 10.1016/s0301-0104(98)00144-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Abstract
We propose an isotopic fractionation mechanism, based on photolytic destruction, to explain the 15N/14N and 18O/16O fractionation of stratospheric nitrous oxide (N2O) and reconcile laboratory experiments with atmospheric observations. The theory predicts that (i) the isotopomers 15N14N16O and 14N15N16O have very different isotopic fractionations in the stratosphere, and (ii) laboratory photolysis experiments conducted at 205 nanometers should better simulate the observed isotopic fractionation of stratospheric N2O. Modeling results indicate that there is no compelling reason to invoke a significant chemical source of N2O in the middle atmosphere and that individual N2O isotopomers might be useful tracers of stratospheric air parcel motion.
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Affiliation(s)
- YL Yung
- Y. L. Yung, Division of Geological and Planetary Sciences, California Institute of Technology, Mail Stop 150-21, Pasadena, CA 91125, USA. C. L. Miller, Atmospheric Kinetics and Photochemistry Group, Jet Propulsion Laboratory, California I
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Melchior A, Bar I, Rosenwaks S. C–Cl and C–H bond cleavage in 193 nm photodissociation of CH3CF2Cl and CH3CFCl2. J Chem Phys 1997. [DOI: 10.1063/1.475048] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Roehl CM, Burkholder JB, Moortgat GK, Ravishankara AR, Crutzen PJ. Temperature dependence of UV absorption cross sections and atmospheric implications of several alkyl iodides. ACTA ACUST UNITED AC 1997. [DOI: 10.1029/97jd00530] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kakesu M, Bandow H, Takenaka N, Maeda Y, Washida N. Kinetic measurements of methyl and ethyl nitrate reactions with OH radicals. INT J CHEM KINET 1997. [DOI: 10.1002/(sici)1097-4601(1997)29:12<933::aid-kin5>3.0.co;2-n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ingólfsson O, Weik F, Illenberger E. The reactivity of slow electrons with molecules at different degrees of aggregation: gas phase, clusters and condensed phase. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s0168-1176(96)04392-3] [Citation(s) in RCA: 118] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Georgiou S, Koubenakis A, Kontoleta P, Syrrou M. Induction and memory effects in the UV laser ablation of weakly absorbing van der Waals films. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00847-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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37
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Catoire V, Lesclaux R, Schneider WF, Wallington TJ. Kinetics and Mechanisms of the Self-Reactions of CCl3O2 and CHCl2O2 Radicals and Their Reactions with HO2. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp960572z] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fan J, Yates JT. Mechanism of Photooxidation of Trichloroethylene on TiO2: Detection of Intermediates by Infrared Spectroscopy. J Am Chem Soc 1996. [DOI: 10.1021/ja952155q] [Citation(s) in RCA: 183] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jingfu Fan
- Contribution from the Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - John T. Yates
- Contribution from the Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
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Nayak AK, Buckley TJ, Kurylo MJ, Fahr A. Temperature dependence of the gas and liquid phase ultraviolet absorption cross sections of HCFC-123 (CF3CHCl2) and HCFC-142b (CH3CF2Cl). ACTA ACUST UNITED AC 1996. [DOI: 10.1029/96jd00226] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Suzuki IH, Saito N, Bozek JD. Ionic Fragmentation of CF3Cl Photoexcited in the Cl L-Shell, C K-Shell, and F K-Shell Transition Regions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.1119] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Suzuki IH, Bozek JD, Saito N. Ionic dissociation of CF2Cl2 photoexcited using monochromatic soft X-rays. Chem Phys 1994. [DOI: 10.1016/0301-0104(94)00003-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Burton GR, Chan WF, Cooper G, Brion C. Valence- and inner-shell (Cl 2p, 2s; C 1s) photoabsorption and photoionization of carbon tetrachloride. Absolute oscillator strength (5–400 eV) and dipole-induced breakdown pathways. Chem Phys 1994. [DOI: 10.1016/0301-0104(94)85022-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Dixon‐Warren SJ, Jensen ET, Polanyi JC. Photochemistry of adsorbed molecules. XI. Charge‐transfer photodissociation and photoreaction in chloromethanes on Ag(111). J Chem Phys 1993. [DOI: 10.1063/1.464888] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dixon‐Warren SJ, Heyd DV, Jensen ET, Polanyi JC. Photochemistry of adsorbed molecules. XII. Photoinduced ion–molecule reactions at a metal surface for CH3X/RCl/Ag(111) (X=Br, I). J Chem Phys 1993. [DOI: 10.1063/1.464889] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Taylor PH, Jiang Z, Dellinger B. Determination of the gas-phase reactivity of hydroxyl with chlorinated methanes at high temperature: Effects of laser/thermal photochemistry. INT J CHEM KINET 1993. [DOI: 10.1002/kin.550250103] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Lawrence WG, Apkarian VA. Two‐photon induced exciton mediated dissociation of N2O and photomobility of O atoms in crystalline Xe. J Chem Phys 1992. [DOI: 10.1063/1.463728] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Braun W, Fahr A, Klein R, Kurylo MJ, Huie RE. UV gas and liquid phase absorption cross section measurements of hydrochlorofluorocarbons HCFC-225ca and HCFC-225cb. ACTA ACUST UNITED AC 1991. [DOI: 10.1029/91jd01026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Orlando JJ, Burkholder JB, McKeen SA, Ravishankara AR. Atmospheric fate of several hydrofluoroethanes and hydrochloroethanes: 2. UV absorption cross sections and atmospheric lifetimes. ACTA ACUST UNITED AC 1991. [DOI: 10.1029/90jd02734] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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