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Enhancement of optically pumped spin orientation via spin exchange collisions at low vapour density.

Chalupczak, W; Godun, R M; Anielski, P*; Wojciechowski, A*; Pustelny, S* (2012) Enhancement of optically pumped spin orientation via spin exchange collisions at low vapour density. Phys. Rev. A, 85 (4). 043402

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Abstract

An effect is demonstrated where off-resonant optical pumping is enhanced by spin-exchange collisions, which enables a high degree of spin orientation to be obtained in alkali metal atoms. The experiments with room-temperature caesium vapour employ radio-frequency spectroscopy under conditions of the nonlinear Zeeman effect that allow the populations of the individual Zeeman sublevels to be determined. The improved efficiency of atomic orientation leads to a significant reduction of population relaxation out of the stretched state, which is observed as a narrowing of radio frequency resonances. Spin exchange collisions play a crucial role in this effect although the applied atomic density ~1011 cm-3 corresponds to collision rates not greater than several tens of Hz. A theoretical model has also been developed to reproduce the measurement results numerically.

Item Type: Article
Subjects: Time and Frequency
Time and Frequency > Microwave Frequency Standards
Identification number/DOI: 10.1103/PhysRevA.85.043402
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5484

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