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The Journal of Chemical Physics

TOF analysis of an optically pumped metastable neon beam

J. P. C. Kroon, Herman C. W. Beijerinck, N.F. Verster

Published Jun 1, 1981• 19 citations
Publisher

Abstract

Optical pumping of a Ne beam is reported. The flight source used was single mode, frequency stabilized dye laser. The light beam and the atomic beam were crossed at right angles. The optical pumping was investigated by mearusing the fluorescence, and the metastable atoms were detected by secondary electron emission fraom a steel surface.(AIP)

DOI
10.1063/1.441001

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 28, 1992•1 citation
Optical pumping of a Ne beam is reported. The flight source used was single mode, frequency stabilized dye laser. The light beam and the atomic beam were crossed at right angles. The optical pumping was investigated by mearusing the fluorescence, and the metastable atoms were detected by secondary electron emission fraom a steel surface.(AIP)
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We report the measurement of Rabi oscillations in the optical pumping of a beam of metastable neon atoms in a three-level system with a cw dye laser. The laser beam is focused on the atomic beam, resulting in an interaction time with the laser beam of the order of the spontaneous lifetime of the induced transition. The Rabi oscillations are measured by a velocity-resolved analysis of the optically pumped metastable atoms. Adiabatic following is observed when the atoms cross the laser beam outside the waist, induced by the Doppler shifts due to the curvature of the wave fronts.
4^44He (2 3^33S1_11​) metastable atoms are optically pumped with intensity modulated light. The use of a single mode diode-pumped LNA laser as the pumping source, allows the study of resonance signals predicted by the optical pumping theory but not yet observed. Resonances are detected on the transmitted pumping beam at the modulation frequency and its harmonics. Application of this method to high sensitivity magnetometers is suggested.
Reports the optogalvanic detection of observables induced by optical pumping in metastable states of neon. As with optical methods signals are obtained which are related to electronic and nuclear orientation or alignment. Many optical pumping experiments may thus be performed using optogalvanic techniques, including the Hanle effect and 'velocity selective optical pumping' described. Different mechanisms are discussed from which optogalvanic signals related to non-scalar observables may originate. Profiles obtained from frequency sweeps of two polarisation-modulated counterpropagating pump beams indicate the dominant mechanism is a second-order pumping effect which induces a modulated depletion of the metastable state. No effect has been observed arising from a variation of the Penning collision cross section when the two metastable colliding atoms are oriented. The analogy between signals produced by optogalvanic and optical methods are pointed out.