HF rotational lasers: Enhancement of V→R multiquantum energy transfer by CO and CO2

The effects of CO, CO2, H2, D2, and HC1 on rotational laser emission from HF have been examined in the HF photoelimination lasers initiated by flash photolysis of vinyl fluoride and 1,1 difluoroethene. Whereas only 1.4 Torr of H2, D2, or HCl act to quench or reduce the gain of those transitions observed in the presence of 50 Torr Ar, a few Torr of either CO or CO2 enhance both the number of transitions observed and their gain. With added CO (to both ethenes), a total of 58 transitions emit in the v = 0 to 5 vibrational manifolds, extending from J = 8→7 to 31→30. For CO2, the total number of transitions reaches 52. The patterns of laser enhancement identify energy transfer pathways that are active, of which VHF→RHF is most easily discerned. Multiquantum transfers involving ΔvHF = 3, ΔJ = 20 and ΔE<kT entering into translation are observed. Some specific emissions that are quenched or reduced in gain by CO2 suggest that RHF→VHFVM is also active. Undoubtedly partcipating, but less easily recognized are VHF→R...

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