首页|Photoionization cross section of first excited state of lithium
Photoionization cross section of first excited state of lithium
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We report the accurate quantitative measurements of the photoionization (PI) cross section of lithium-7 confined in a magneto-optical trap (MOT). The losses from the MOT induced by radiation of the low-power light-emitting diodes (LEDs) are measured as a function of the photoionizing radiation intensity. On the basis of these measurements, the PI cross section from the 2P_(3/2) excited state of lithium is evaluated for three different LEDs. The PI cross sections of lithium from the 2P_(3/2) state at 259, 280, 307 run are determined to be (5.4 ± 0.4), (8.1 ± 0.8) and (9.5 ± 1.1) Mb respectively. Accuracy of our measurements is better than that of previous reported results. The semiclassical calculations taking into account the fine structure of the first excited state of lithium are performed. Our values are in good agreement with experimental results earlier reported and are consistent with the theoretical data.
Photoionization cross sectionLaser cooling and trappingLithiumLight-emitting diodes
Sergey Saakyan、Lev D'yachkov、Stepan Klimov
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Joint Institute for High Temperatures, Russian Academy of Sciences (JIHT RAS), Izhorskaya Street 13 Bld. 2, Moscow 125412, Russia
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