ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Vibrationally excited levels of the a 4Π state, the lowest electronically excited state of the NO molecule, can be studied through their collisional energy transfer to the radiating B 2Π state. Following one-photon excitation in the 11–0 band of the forbidden a 4Π–X 2Π transition with the output of a tunable dye laser, we monitor the temporal evolution of the emission from the v=2 level of the B 2Π state. From pressure-dependence analysis, we determine the removal rate coefficients for a 4Π(v=11) with NO, O2, N2O, N2, CO2, He, and Ar. In addition, using direct B 2Π excitation of the v=2, 3, 4 levels, we obtain removal rate coefficients for the same colliders. These vibrational levels span the region around a 4Π(v=11). In general, a 4Π removal is quite fast, ranging from rate coefficients of 1.0×10−12 cm3 s−1 to more than 1.0×10−10 cm3 s−1, and is substantially faster than B 2Π removal for N2, N2O, CO2, and Ar. NO(B 2Π, v=3) removal is generally much faster than that for the v=2 and v=4 levels, because of a localized perturbation between the v=12 level of the a 4Π state and v=3 of the B 2Π state. Preliminary measurements on transfer between the b 4Σ− and B 2Π states are reported. © 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.474603
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