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Preparing Reagents: Time Dependence of HCl( v =1, J ) Alignment Following Pulsed Infrared Excitation
Author(s) -
OrrEwing A.J.,
Simpson W.R.,
Rakitzis T.P.,
Zare R.N.
Publication year - 1994
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199400014
Subject(s) - chemistry , reagent , hyperfine structure , infrared , excitation , optical parametric oscillator , ionization , atomic physics , absorption (acoustics) , analytical chemistry (journal) , molecular physics , laser , optics , ion , physics , organic chemistry , quantum mechanics , chromatography
We discuss the use of photon absorption as a means of aligning reagents for studies of dynamical stereochemistry. A linearly polarized infrared beam from an optical parametric oscillator prepares HCl( v = 1, J = 1), and the alignment is monitored at subsequent times by (2+1) resonance‐enhanced multiphoton ionization. The degree of alignment oscillates in time caused by hyperfine quantum beats. Experimental observations are well matched by calculations that account for the presence of unresolved hyperfine structure. Following reagent preparation by optical pumping, a cumulative hyperfine‐depolarization coefficient can be used to describe the effective reagent alignment in a subsequent chemical reaction.