Issue 48, 2010
From the journal:

Physical Chemistry Chemical Physics

Time-dependent depolarization of aligned D2 caused by hyperfine coupling

Nate C.-M. Bartlett,a   Justinas Jankunas,a   Richard N. Zare*a  and  John A. Harrisonb  

* Corresponding authors

a Department of Chemistry, Stanford University, Stanford, USA
E-mail: zare@stanford.edu

b Institute of Natural Sciences, Massey University, Private Bag 102 904, North Shore Mail Centre, Auckland, New Zealand

Abstract

Molecular deuterium is prepared in the J = 2, M = 0 sublevel of ν = 1 by stimulated Raman pumping of the ν = 0 S(0) line. Following optical excitation, the degree of alignment of the rotational angular momentum J oscillates in time caused by the coupling of J to the total nuclear spin angular momentum IT. This coupling is of two kinds, the interaction of J with the magnetic moments and the quadrupole fields of the two I = 1 deuterium nuclei. The alignment is monitored via the O(2) line of the E,F1Σg+ − X1Σg+ (0,1) band using [2+1] resonance enhanced multiphoton ionization for pump–probe delays from 0 to 20 μs. Using the hyperfine coupling constants found previously for the ν = 0 state (R. F. Code and N. F. Ramsey, Phys. Rev. A, 1971, 4, 1945), we are able to fit the time dependence essentially within our experimental error, but this requires that the presence of both IT = 0 and IT = 2 nuclear spin states for this o-deuterium level is properly weighted and taken into account.

Graphical abstract: Time-dependent depolarization of aligned D2 caused by hyperfine coupling

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Article information

DOI
https://doi.org/10.1039/C0CP00518E
Article type
Paper
Submitted
11 May 2010
Accepted
30 Jun 2010
First published
29 Jul 2010

Phys. Chem. Chem. Phys., 2010,12, 15689-15694

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Time-dependent depolarization of aligned D2 caused by hyperfine coupling

N. C.-M. Bartlett, J. Jankunas, R. N. Zare and J. A. Harrison, Phys. Chem. Chem. Phys., 2010, 12, 15689 DOI: 10.1039/C0CP00518E

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