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Hanle effect in mercury vapor

Anne Green Romer

Published Jan 1, 1967• 0 citations
OpenAlex

Abstract

A description is given of an apparatus suitable for an advanced undergraduate laboratory experiment illustrating the Hanle Effect (zero-field level crossing method) in Hg vapor.

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Physical Review A•Jun 1, 1971•8 citations
An experiment is described which utilizes the Hanle technique for measurement of atomic excited-state lifetimes, with particular application to the P13 state of mercury. The components for the experiment are comparatively inexpensive or readily constructed, and the technique is one of the few which directly illustrate features of the interaction between radiation and free atoms. A simple classical description of the effect is given, followed by a more detailed quantum description, as well as constructional details of an experimental arrangement suitable for an advanced undergraduate or graduate laboratory.
We present experimental verification of a certain number of theoretical predictions given in the preceding paper. The narrowing of the different Hanle-effect signals by multiple diffusion is clearly weaker if observed using the light scattered in the backward direction than if observed using the laterally scattered light. This narrowing can become very small if the vapor is illuminated with light whose frequency is in the wings of the Doppler absorption width of the vapor. The values of the ratios of the widths and intensities of the different Hanle-effect signals that were measured are in good agreement with the values predicted by theory.