Ph. Ma et al., Isotopically selective infrared multiphoton dissociation of 2-chloro-1,1,1-trifluoroethane: C-13 selectivity and mechanism, APP PHYS B, 68(1), 1999, pp. 107-110
The C-13-selective infrared multiphoton dissociation of CF3CH2Cl has been s
tudied by analyzing the distribution of C-13 concentrations of the main pro
ducts CF2=CHCl, CF2=CH2, CF2=CHF, C2F6, and the trace products CF3CH2CF3 an
d CF3CH=CHF3. The mechanism mainly concerns the dissociation of energized C
F3CH2Cl, the collisional stabilization of excited CF3CH and CF3CH2 and the
recombination of the nascent radicals. Mo signifi cant radical-molecule rea
ctions degrade the intrinsic C-13 dissociation selectivity. High C-13 produ
ction yield and C-13 concentration can be attained at a laser fluence of 1.
6 J/cm(2). Such low fluence can be used to improve focus condition and enha
nce photon utilization efficiency for practicable C-13 separation.