Effect of rapid spin exchange on the magneticresonance spectrum of alkali vapors
Abstract
It was recently discovered that when there are sufficiently rapid spinexchange collisions in an alkalimetal vapor, the rf magneticresonance frequency of the groundstate atoms becomes a constant fractional value (e.g., 411 for Cs) of the Larmor frequency, and the linewidth becomes inversely proportional to the spinexchange rate. These properties are in complete contrast to those in the slow spinexchange limit. We present a theoretical analysis of these properties, and we predict some additional new effects for rapid spin exchange. Four theories are presented; an intuitivevector model, a perturbation treatment, numerical solutions of complex nonHermitian matrices, and a statistical analysis of the effect of rapid transfers between two Zeeman multiplets. These theories all provide, to varying degrees, consistent quantitative answers to the problem of how spin exchange affects magnetic resonance in an alkali vapor.
 Publication:

Physical Review A
 Pub Date:
 November 1977
 DOI:
 10.1103/PhysRevA.16.1877
 Bibcode:
 1977PhRvA..16.1877H