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Title: Nuclear relaxation of {sup 3}He in the presence of NO

Abstract

By virtue of the fact that its low-lying {sup 2}{pi}{sub 3/2} state is paramagnetic, nitric oxide (NO) can be an effective agent for inducing nuclear spin relaxation during isolated binary collisions with other species. At the same time, the strong coupling between the electronic angular momentum and the internuclear axis of this particular molecule leads to a situation in which its effective magnetic moment depends critically on molecular motions that take place on the time scale of the collision. Here we present the results of an investigation in which the NMR-detected longitudinal nuclear relaxation rate T{sub 1}{sup -1} of room temperature {sup 3}He gas adulterated with NO was measured as a function of NO density ([NO]) in two different magnetic fields. We find T{sub 1}{sup -1}=0.0502(3)[NO] s{sup -1} at 1.50 T, and T{sub 1}{sup -1}=0.0506(3)[NO] s{sup -1} at 2.35 T, where [NO] is expressed in amagat. Under these conditions approximately two-thirds of the NO molecules occupy the diamagnetic {sup 2}{pi}{sub 1/2} ground state and one-third occupy the paramagnetic {sup 2}{pi}{sub 3/2} state. Our data can be understood in terms of a semiclassical treatment of collision dynamics that involves the paramagnetic moment autocorrelation function.

Authors:
; ; ; ;  [1]
  1. Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada)
Publication Date:
OSTI Identifier:
20974592
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.73.022721; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ATOM-MOLECULE COLLISIONS; DENSITY; GROUND STATES; HELIUM 3; MAGNETIC FIELDS; MAGNETIC MOMENTS; MOLECULES; NITRIC OXIDE; NUCLEAR MAGNETIC RESONANCE; PARAMAGNETISM; SEMICLASSICAL APPROXIMATION; SPIN; SPIN-SPIN RELAXATION; STRONG-COUPLING MODEL; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Archibald, G., Brief, E., Lei, C., Pausak, T., and Hayden, M. E. Nuclear relaxation of {sup 3}He in the presence of NO. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.022721.
Archibald, G., Brief, E., Lei, C., Pausak, T., & Hayden, M. E. Nuclear relaxation of {sup 3}He in the presence of NO. United States. doi:10.1103/PHYSREVA.73.022721.
Archibald, G., Brief, E., Lei, C., Pausak, T., and Hayden, M. E. Wed . "Nuclear relaxation of {sup 3}He in the presence of NO". United States. doi:10.1103/PHYSREVA.73.022721.
@article{osti_20974592,
title = {Nuclear relaxation of {sup 3}He in the presence of NO},
author = {Archibald, G. and Brief, E. and Lei, C. and Pausak, T. and Hayden, M. E.},
abstractNote = {By virtue of the fact that its low-lying {sup 2}{pi}{sub 3/2} state is paramagnetic, nitric oxide (NO) can be an effective agent for inducing nuclear spin relaxation during isolated binary collisions with other species. At the same time, the strong coupling between the electronic angular momentum and the internuclear axis of this particular molecule leads to a situation in which its effective magnetic moment depends critically on molecular motions that take place on the time scale of the collision. Here we present the results of an investigation in which the NMR-detected longitudinal nuclear relaxation rate T{sub 1}{sup -1} of room temperature {sup 3}He gas adulterated with NO was measured as a function of NO density ([NO]) in two different magnetic fields. We find T{sub 1}{sup -1}=0.0502(3)[NO] s{sup -1} at 1.50 T, and T{sub 1}{sup -1}=0.0506(3)[NO] s{sup -1} at 2.35 T, where [NO] is expressed in amagat. Under these conditions approximately two-thirds of the NO molecules occupy the diamagnetic {sup 2}{pi}{sub 1/2} ground state and one-third occupy the paramagnetic {sup 2}{pi}{sub 3/2} state. Our data can be understood in terms of a semiclassical treatment of collision dynamics that involves the paramagnetic moment autocorrelation function.},
doi = {10.1103/PHYSREVA.73.022721},
journal = {Physical Review. A},
number = 2,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}