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MA1 - Laser-excited vibrational energy transfer studies of HF, CO, and NO

By: Hancock, J.; Green, W.;

1973 / IEEE


This item was taken from the IEEE Periodical ' MA1 - Laser-excited vibrational energy transfer studies of HF, CO, and NO ' An electrically initiated pulsed HF chemical laser has been used to measure vibrational relaxation of HF (\upsilon = 1), CO (\upsilon = 1), and NO (\upsilon = 1) at 295 � 2 K. The self-relaxation rate of HF highly dilute in argon is(8.7 \pm 0.1) \times 10^{4} s^{-1}torr-1and is independent of rotational level excitation over laser transitionsP_{1 \rightarrow 0}(2) - P_{1 \rightarrow 0}(9). The rates at which O2, CO, and NO quench HF(\upsilon = 1) have been found to be350 \pm 25, (2.5 \pm 0.2) \times 10^{3}and(6.2 \pm 0.3) \times 10^{3}s-1torr-1, respectively. There is indirect evidence of transfer from HF(\upsilon = 1) to the (\upsilon = 2) levels of NO and O2. Through the use of HF (\upsilon = 1) as a collisional pumping source we have measured the deactivation rates of CO (\upsilon = 1) by HF (V � R, T) and N2(V � V) to be 480 � 25 s-1torr-1and 130 � 15 s-1torr-1. Similarly, HF (\upsilon = 1) has been used to pump NO (\upsilon = 1) and the NO self-relaxation rate has been measured to be(2.7 \pm 0.2) \times 10^{3}s-1torr-1; this rate is about a factor of 5 faster than would be predicted by the kinetic spectroscopy results of Billingsley and Callear [43].