Spin Absorption of Solids

Author: Cheng, Hung

Year: 1962

Degree: Dissertation (Ph.D.)

Advisors: Davis, Leverett; McConnell, Harden M.; Mathews, Jon

Committee Member: Unknown, Unknown

Option: Physics

DOI: 10.7907/C3AW-KJ62

Abstract

A study of the spin absorption lines of all orders was made. Rules for obtaining the absorption opera tor of any line were found, and a generalization of the method of moments was obtained. With magnetic dipole-dipole and exchange interactions taken into account, and with the assumption that the Zeeman energy is dominant, the zeroth and the second moments of the following four lines were evaluated without approximations for powders: (1) first Larmor line, parallel field, ( 2) second Larmor line, parallel field, (3) second Larmor line, perpendicular field, (4) low frequency line, perpendicular field. The contribution of exchange to the second moment was found to be the same for the four cases treated, while the total intensity has the ratio 1: 1: 1: 3/2. Agreement with existing experimental data is good.

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