PREDISSOCIATION LIFETIMES OF OH A2-SIGMA+ (V'=3) OBTAINED FROM OPTICAL OPTICAL DOUBLE-RESONANCE LINEWIDTH MEASUREMENTS

被引:72
作者
GRAY, JA
FARROW, RL
机构
[1] Combustion Research Facility, Sandia National Laboratories, Livermore
关键词
D O I
10.1063/1.461433
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The excitation of rapidly predissociating upsilon' = 3 levels in the A2-SIGMA+ state of OH has recently been suggested as a means of avoiding collisional quenching corrections when performing laser-induced fluorescence (LIF) measurements in flames. We report measurements of predissociation rates of several rotational levels in upsilon' = 3, obtained from linewidths in optical-optical double-resonance (OODR) spectra. The magnitude of the observed predissociation rates places an upper limit on the pressures at which OH LIF can be considered "quench-free." In addition, analysis of spectral line shapes suggests that rotational transfer can significantly affect LIF quantum yields at pressures of 1 atm and higher. We conclude that variations of the predissociation rate with rotational level in upsilon' = 3 must be included in determinations of rotational temperatures from LIF.
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页码:7054 / 7060
页数:7
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