Multiple infrared photon dissociation of vinyl chloride

Lussier, Frances M.; Steinfeld, J. I.

doi:10.1016/0009-2614(77)80158-9

Cited by 38 publications

(7 citation statements)

References 21 publications

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“…Lussier and Steinfeld [65] achieved similar results in the IRMPD of vinyl chloride under identical circumstances to ours. ey identify stable end products C 2 H 2 , HCl, C 4 H 2 , H 2 , and a solid deposit when the laser energy is highly concentrated in this situation.…”

Section: Ftir Spectroscopy Study Of the Soot Depositssupporting

confidence: 83%

FTIR and Raman Spectroscopy Study of Soot Deposits Produced in the Infrared Multiphoton Dissociation of Vinyl Bromide

Samoudi

Bendaou

Hanafi

et al. 2022

Journal of Spectroscopy

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Even at low concentrations, poly-aromatic hydrocarbons found in soot have substantial health implications. Soot deposits have been reported and studied using FTIR and Raman spectroscopy. Using a CO2 photolysis laser, the samples were obtained via infrared multiphoton dissociation (IRMPD) of vinyl bromide (VBr, C2H3Br) molecules. The solid deposit formed in the IRMPD of VBr when a relatively high fluence of the order of 204 J.cm−2 was analyzed by FTIR, and it was discovered that the majority of its composition is aromatic and aliphatic hydrocarbons. Significant fullerene-type carbonaceous soot particles are also found, which could correspond to C60 and C70 or other carbonaceous agglomerates of a higher order; however, the disappearance of this fullerene on Raman spectra cast doubt on this explanation. Our samples’ Raman spectroscopy has been compared to Tamor and Vassell’s research, which may indicate that they have a lesser degree of hardness and density than these authors’ results, indicating a larger hydrogen content in our samples. The optical gap has been calculated, yielding a very limited range of values ranging only between 1.0 and 1.2 eV, resulting in a crystalline size of 0.58 to 1.12 nm.

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Section: Ftir Spectroscopy Study Of the Soot Depositssupporting

confidence: 83%

FTIR and Raman Spectroscopy Study of Soot Deposits Produced in the Infrared Multiphoton Dissociation of Vinyl Bromide

Samoudi

Bendaou

Hanafi

et al. 2022

Journal of Spectroscopy

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“…The variation in the acetylene yields with wavelength shown in Table 2 follows approximately the low-intensity low-resolution absorption spectrum of vinyl chloride (4), except for the yield with the P3, line at 933 cm-l. which lies in a more structured region of the absorption spectrum, and showed the highest yield both in the present and previous studies (4). In view of the probably complex effects of pressure, dynamic stark modulation, and line bleaching 011 the absorption, already discussed in some detail by Steinfeld et al (4,5), and in view of the uncertain power gradients in the focussed beam, further discussion of the wavelength dependence is unwarranted here.…”

Section: Variation Of Yields With Wavelengthsupporting

confidence: 51%

“…In view of the probably complex effects of pressure, dynamic stark modulation, and line bleaching 011 the absorption, already discussed in some detail by Steinfeld et al (4,5), and in view of the uncertain power gradients in the focussed beam, further discussion of the wavelength dependence is unwarranted here.…”

Section: Variation Of Yields With Wavelengthmentioning

confidence: 93%

Decomposition of vinyl chloride induced by multiphoton absorption of infrared radiation. I. Decomposition yields

Gandini¹,

Willis²,

Back³

et al. 1979

Can. J. Chem.

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A. GANDINI, C. WILLIS, R. A. BACK, and J. M. PARSONS. Can. J. Chem. 57,953 (1979). The infrared induced decomposition of vinyl chloride has been studied as a function of pressure and as a function of exciting wavelength with a pulsed C 0 2 laser. The main reaction gives CzHz and HCI CzH3CI + CzHz + HCI but smaller amounts of C2H4 are observed. At pressures below 0.5 Torr, the yield of C2H4 shows apparent enhancement relative to CzHz. In an earlier publication it had been speculated that this was due to dissociation from higher vibrational levels attained in the multiphoton absorption process. Present data indicate this is not the case and suggest rather strongly that the enhanced CZH4 yield is derived from infrared induced decomposition of CzH3CI on cell windows and walls.The effective quantum yield of CzHz increases approximately linearly with pressure in the range 0-2.5 Torr and C2H3CI, Hz, and 0, produce similar behaviour. This is interpreted in terms of collisional enhancement of photon absorption associated with depletion of specific rotational states by the laser radiation.A. GANDINI, C. WILLIS, R. A. BACK et J. M. PARSONS. Can. J. Chem. 57,953 (1979). Utilisant un laser a COz on a ktudik la dkcomposition, induite par I'infrarouge, du chlorure de vinyle en fonction de la pression et en fonction de la longueur d'onde servant exciter. La reaction principale fournit du CzHz et du HCI, CzH3CI + CzHz + HCI mais on a observe la formation de quantitks plus faibles de C2H4. A des pressions inferieures a 0.5 Tom, le rendement en C2H4 subit une augmentation par rapport a CZH2. Dans une publication anterieure, il avait kt6 suggkrk que ceci est dC ti une dissociation provenant de niveaux vibrationnels superieures obtenues dans un processus d'absorption multiphoton. Les donnees rapportkes ici indiquent que ce n'est pas le cas et suggkrent plutBt fortement que I'augmentation du rendement en CzH4 provient de la dkcomposition induite par I'infrarouge du CzH3Cl sur les fenetres et les parois de la cellule.Le rendement quantique effectif de CzHz augmente d'une f a~o n approximativement linkaire avec la pression entre 0 et 2.5 Torr. Le CzH3CI, H z et O2 provoquent des comportements semblables. On interprkte ces rksultats en termes d'une augmentation collisionnelle de l'absorption des photons qui est associke avec une diminution des ktats rotationels spkcifiques provoquke par la radiation laser.[Traduit par le journal]

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“…The acetylene arises from subsequent multiple infrared photon excitation of the vinyl chloride product [2,9], followed by HC1 elimination. The combined vinyl chloride + acetylene yield was within 20%, and frequently within lo%, of the yield of ethylene.…”

Section: Product Identificationmentioning

confidence: 99%

Infrared photochemistry of cyclobutyl chloride

Francisco

Steinfeld

1981

Int J of Chemical Kinetics

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The decomposition of cyclobutyl chloride following multiple infrared photon excitation has been investigated. The primary photolysis products are butadiene, from elimination of HC1, and ethylene and vinyl chloride, from ring scission. The vinyl chloride undergoes secondary decomposition to acetylene and HC1. In addition to these products, known from thermal VLPP experiments, we also find 1-butene, which may arise from a higher energy C-Cl homolysis channel. Collisions with either reactant molecules or added buffer gas lead to cooling of the laser-produced vibrational energy distributions. The average amount of energy removed per collision is 15-20 kcal/mol for self-collisions and 2-4 kcal/mol with argon.

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Multiple infrared photon dissociation of vinyl chloride

Cited by 38 publications

References 21 publications

FTIR and Raman Spectroscopy Study of Soot Deposits Produced in the Infrared Multiphoton Dissociation of Vinyl Bromide

FTIR and Raman Spectroscopy Study of Soot Deposits Produced in the Infrared Multiphoton Dissociation of Vinyl Bromide

Decomposition of vinyl chloride induced by multiphoton absorption of infrared radiation. I. Decomposition yields

Infrared photochemistry of cyclobutyl chloride

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