Mechanisms of HF laser emissions from flash-initiated CHFCl2and CH2FCl-NO mixtures

HF infrared stimulated emission was observed from flash-initiated CHFCl
2
-NO and CH
2
FCl-NO mixtures above 165 nm. Several
P(J)
lines were detected between
\Delta\upsilon (2 \rightarrow 1)
and (1 → 0) in the CHFCl
2
system, while only (1 → 0) lines were observed in the CH
2
FCl system. Addition of D
2
generated DF emission in the former system, whereas it was absent in the latter. Detailed parametric study, including the mass spectrometric analysis of flashed products, led us to conclude that the principal laser-pumping reaction is CHF + NO → CHFNO
\dagger
→ HF
\dagger
+ CNO. Other possible side reactions in these systems are discussed. No laser emission was detected from flashed CHF
2
Cl-NO mixtures under the same experimental conditions.