Low-field relaxation and the study of ultraslow atomic motions by magnetic resonance

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Ailion, David Charles
Other Author Slichter, Charles P.
Title Low-field relaxation and the study of ultraslow atomic motions by magnetic resonance
Date 1964
Description Conventional resonance enables one to study motion of atoms by measurement of line width when the mean time r between jumps is less than 1/Aco, where Aa> is the rigid lattice line width, or by measurement of the spin-lattice relaxation time, Ti, when r ^ l / coo , where coo is the Larmor frequency. We describe a new technique applicable when T<TI. It is therefore applicable to the study of very slow motion. The method is analogous to measuring T\ with coo = 0. However, we are able to keep cu0 in the megacycle region by performing the experiments in the reference frame rotating at the Larmor frequency. Analysis of the technique requires solution of the problem of the effect of infrequent motion on the nuclear relaxation time when the applied static field is comparable to the local field. The relaxation time is then comparable to r, indicating that jumps are strong "collisions" for the spins. The case of strong "collisions" is not treated in the conventional treatment of Bloembergen, Purcell, and Pound. We solve the problem by use of the concept of spin temperature and the sudden approximation. Explicit formulas are given for the nuclear relaxation in the laboratory for weak static fields, and in the rotating frame for alternating fields of the order of or less than the local field. We treat both diffusional motion and molecular reorientation.
Type Text
Publisher American Physical Society
Volume 135
Issue 4A
First Page A1099
Last Page A1110
Subject Ultraslow atomic motion; Magnetic resonance
Subject LCSH Magnetic resonance; Atoms
Language eng
Bibliographic Citation Slichter, C. P. & Ailion, D. C. (1964). Low-field relaxation and the study of ultraslow atomic motions by magnetic resonance. Physical Review, 135(4A), A1099-A110.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 2,296,121 Bytes
Identifier ir-main,4998
ARK ark:/87278/s6p84w16
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2013-02-05
ID 702889
Reference URL https://collections.lib.utah.edu/ark:/87278/s6p84w16
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