Collisional averaging of the Stark and Zeeman spectrum structure

Anatoly I. Burshtein, Gennady I. Smirnov

Published Dec 1, 1973• 0 citations

Abstract

The effect of depolarizing collisions on the shape of the spectrum in the quadratic Stark effect or anomalous Zeeman effect is conSidered. It is shown that collisions may result in merging (collapse) of the allowed spectral components. It is found that exchange between the Stark and Zeeman components can be observed by analyzing the structure of the Lamb dip. An additional (certral) dip is detected. Methods for experimental determination of the collisional relaxation constants and of the parameters of the Stark and Zeeman structures of the spectrum are mentioned. (auth)

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Collisional averaging of the Stark and Zeeman spectrum structure

Anatoly I. Burshtein, Gennady I. Smirnov

Published Dec 1, 1973• 0 citations

OpenAlex

Abstract

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(1snp)^{3}P_{J}(J=0, 1, 2)

of the helium atom. After a review of previous optical spectroscopic work and theory of this fine structure, an old unsolved mystery concerning the polarization of collision light is discussed. The theory of the Zeeman effect is worked out in a form applicable to the microwave experiments. Expected transition frequencies and rf matrix elements, intensity changes and shape of resonance curves, Stark effect and singlet-triplet mixing are also considered. An estimate is made of the signal to be expected in the experiment described in the following paper.

J=0

J=1

transition for polarization parallel to the laser polarization is essentially an asymmetric triplet, whereas for a perpendicular polarization due to collisions the spectrum is essentially a doublet (whose frequencies do not correspond with any of those of the triplet). Further, the width of the fluorescent component (whose frequency is close to the unperturbed frequency) actually decreases with increasing laser power.

Collisional transitions between Zeeman substates of Cs

\\rm 6\\sp2P\\sb{1/2}

atoms in collisions with He atoms have been investigated by methods of atomic fluorescence spectroscopy. Cs vapour contained in a quartz cell together with helium at low pressure, was selectively excited by pulsed dye-laser radiation to the

\\rm 6\\sp2P\\sb{1/2,-1/2}

Zeeman substate in a magnetic field of strength ranging from 1.5 T to 7 T. The fluorescence spectrum consisting of components emitted from the directly excited state and from the collisionally populated state, was resolved with a Fabry-Perot interferometer. Measurements of the relative intensities of the fluorescence components yielded the Zeeman mixing cross section for Cs-He collisions. It was found that the enhancement in the cross section varied as B

\\sp2

in the range 0 $$ 5 T. A theoretical calculation of the magnetic-field enhancement of the cross section was also carried out, using time-dependent perturbation theory. The results of the calculation are in very good agreement with the experimental results at fields in the range 0

<

<

5 T, though not beyond 5 T where further theoretical work remains to be done.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1993 .G365. Source: Masters Abstracts International, Volume: 32-02, page: 0636. Adviser: L. Krause. Thesis (M.Sc.)--University of Windsor (Canada), 1993.