Accession Number:

AD0600076

Title:

THE MAGNETIC FIELD DEPENDENCE OF PARAMAGNETIC RELAXATION IN A KRAMERS SALT AT LOW TEMPERATURES.

Descriptive Note:

Technical rept.

Corporate Author:

JOHNS HOPKINS UNIV BALTIMORE MD CARLYLE BARTON LAB

Personal Author(s):

Report Date:

1964-05-01

Pagination or Media Count:

128.0

Abstract:

Paramagnetic relaxation rates were measured for iron in dilute potassium ferricyanide at liquid helium temperatures and over a range of static magnetic field strengths covering approximately 1.1-3.6 kilogauss. The relaxation rates were measured by observing the transient behavior of a paramagnetic resonance line following inversion by adiabatic rapid passage. For the conditions under which this experiment was performed, a review of the Kronig-Van Vleck theory of single phonon, or direct, relaxation was shown to yield 1T sub 1D const. applied mag. field to the 4th powerT. In analyzing the experimental data, the direct relaxation rate was separated from the observed relaxation rate by subtracting the Raman term observed by previous researchers. The results for all but the highest field value showed good agreement with the predicted fourth-power field dependence. At the highest value of the field a marked size effect was noted however, the results of experiments performed with the smallest sample were shown also to give good agreement with the theory. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE