Infrared fluorescence from CO2 laser-pumped CF2HCl: collision dynamics of intermode energy flow

Vatsa, R.K.; Kumar, Awadhesh; Naik, Prakash D.; Rao, K. Vijayachander; Mittal, Jai P.

doi:10.1039/ft9938900639

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…To check for the presence of vibrationally excited CH 3 NO 2 , the timeresolved infrared fluorescence from the υ 1 mode of CH 3 NO 2 was monitored when CF 2 HCl was excited. In earlier work 14 , we reported infrared fluorescence from the υ 1 mode of CF 2 HCl following CO 2 laser excitation in the υ 3 mode. Figure 2a shows the IRF signal from the υ 1 mode of CF 2 HCl in the absence of nitromethane.…”

Section: Infrared Fluorescence Studiesmentioning

confidence: 93%

“…The experimental set up used for infrared fluorescence has been described in detail earlier 14,15 . Briefly, experiments were performed in a cell having two orthogonal pairs of windows.…”

Section: Methodsmentioning

confidence: 99%

“…Dissociation of nitromethane was observed when a mixture of CF 2 HCl (8 torr) and CH 3 NO 2 (8 torr) is irradiated at 9R(24) laser line under low fluence conditions (0⋅5 J/cm 2 ). Under this pressure and fluence condition, the average number of photons absorbed <n> is approximately unity 14 . Typical results indicated about 10% dissociation in CH 3 NO 2 while CF 2 HCl did not dissociate after 1000 pulses of irradiation.…”

Section: Effect Of Fluence and Pressurementioning

confidence: 96%

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TEA CO2 laser-induced reaction of CH3NO2 with CF2HCl: A mechanistic study

2001

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Dissociation of nitromethane has been observed when a mixture of CF 2 HCl and CH 3 NO 2 is irradiated using pulsed TEA CO 2 laser at 9R (24) line (1081 cm-1), which is strongly absorbed by CF 2 HCl but not by CH 3 NO 2. Under low laser fluence conditions, only nitromethane dissociates, whereas at high fluence CF 2 HCl also undergoes dissociation, showing that dissociation occurs via the vibrational energy transfer processes from the TEA CO 2 laser-excited CF 2 HCl to CH 3 NO 2. Time-resolved infrared fluorescence from vibrationally excited CF 2 HCl and CH 3 NO 2 molecules as well as UV absorption of CF 2 radicals are carried out to elucidate the dynamics of excitation/dissociation and the chemical reactions of the dissociation products.

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