Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 39, Issue 6, Pages 694-699Publisher
WILEY
DOI: 10.1002/jrs.1976
Keywords
femtosecond spectroscopy; molecular alignment; rotational coherence; relaxation dynamics
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The present work explores the extension of the concept of short-pulse-induced alignment to dissipative environments within quantum mechanical density matrix formalism (Liouville equation) from the weak to the strong field regime. This is illustrated within the example of the CO2 molecule in mixture with Ar and He, at room temperature, for which a steep decrease of the alignment is observed at moderate pressure because of the collisional relaxation. The field-free alignment is measured by a polarization technique where the degree of alignment is monitored in the time domain by measuring the resulting transient birefringence with a probe pulse Raman induced polarization spectroscopy (RIPS) Copyright (c) 2008 John Wiley & Sons, Ltd.
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