Journal
CHEMICAL PHYSICS LETTERS
Volume 388, Issue 4-6, Pages 358-362Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2004.03.025
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Two-color polarization spectroscopy was used to investigate rotational energy transfer (RET) and relaxation of orientation and alignment in the ground electronic state of OH in an atmospheric-pressure methane-air flame. Two independently tunable lasers produced nearly transform-limited infrared and ultraviolet pulses of 50 ps duration. The infrared laser excited rovibrational transitions, and delayed ultraviolet pulses probed electronic transitions from either the directly pumped or collisionally populated states. Alignment and orientation relaxation times were measured for individual rotational levels in OH X-2 Pi(3/2) (v = 1), and the feasibility of time-domain investigation of state-to-state energy transfer processes was demonstrated. (C) 2004 Elsevier B.V. All rights reserved.
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