Journal of Physical Chemistry p. 102 - 106 (1988)
Update date:2022-08-11
Topics:
Chowdhury, P. K.
Rao, K. V. S. Rama
Mittal, J. P.
The infrared multiphoton dissociation (IRMPD) of decafluorocyclopentane (DFCP) generates tetrafluoroethylene and difluorocarbene as the primary products.The :CF2 dimerizes to form C2F4; the kinetics of the reaction is followed by monitoring the disappearance of :CF2 absorption at 249 nm in real time after the CO2 laser pulse, with a rate constant k2=4.35E7 M-1s-1.The vibrational temperature associated with the nascent :CF2 is found to be 1100 K.The MPD yield of DFCP shows a strong fluence dependence, with a threshold of ca. 0.5 J/cm2 for the 10 R(40) CO2 laser line.The MPD spectra reveal two peaks, one 22 cm-1 red-shifted from the 989 cm-1 strong IR absorption band.Addition of SF6 decreases the MPD yield.
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