Photoionization cross-sections of the first excited states of sodium and lithium in a magneto-optical trap
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- Wippel, V., Binder, C., Huber, W. et al. Eur. Phys. J. D (2001) 17: 285. doi:10.1007/s100530170002
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A two element magneto-optical trap (MOT) for Na and 7Li or 6Li is used to cool and trap each of them separately. A fraction of the cold atoms is maintained in the first 2P3/2 excited state by the cooling laser. These excited state atoms are ionized by laser light in the near-UV region, giving rise to a smaller number of trapped atoms and to different loading parameters. Photoionization cross-sections were derived out of these data. They are in reasonable agreement with data previously obtained using thermal samples and with theoretical predictions.