Rotational energy transfer in NO (A 2Sigma+,v'=0) by N2 and O2 at room temperature.
State-to-state rotational energy transfer (RET) rate coefficients for NO (A 2Sigma+, v'=0, J=5.5, 11.5, 17.5) were measured for N2 and O2 at room temperature using a pump-probe method. The NO A 2Sigma+ state is prepared by 226 nm light and the RET is monitored by fluorescence from the D 2Sigma+ v'=0 state, following excitation by a time-delayed laser at approximately 1.1 microm. Additionally, total collisional removal and final state distributions were measured exciting in the Q1+P21 band head, to simulate an NO laser-induced fluorescence atmospheric monitoring scheme. Time-resolved modeling is used to understand relaxation mechanisms and predict relaxation times in ambient air. H2O at atmospherically relevant concentrations does not affect the degree of RET in ambient air.
Lee
Seonkyung
S
Molecular Physics Laboratory, SRI International, Menlo Park, California 94025, USA.
Luque
Jorge
J
Reppel
Julie
J
Brown
Austin
A
Crosley
David R
DR