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APS

Use of an atom trap for measuring electron-impact excitation cross sections out of the excited states of rubidium

M. Larsen, Todd A. Zimmerman, John B. Boffard, L. W. Anderson, Chun Chia Lin

Published May 1, 2002• 0 citations
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Electron-impact excitation of the states of a doubly-charged rubidium ion

Yu. M. Smirnov, M. B. Shapochkin

Optics and Spectroscopy•Aug 1, 1979•0 citations
An atom trapping technique for determining absolute, total ionization cross sections (TICS) out of an excited atom is presented. The unique feature of our method is in utilizing Doppler cooling of neutral atoms to determine ionization cross sections. This fluorescence-monitoring experiment, which is a variant of the ``trap loss'' technique, has enabled us to obtain the experimental electron impact ionization cross sections out of the Cs 62P3∕26\phantom{\rule{0.2em}{0ex}}^{2}{P}_{3∕2}62P3∕2​ state between 7eV7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}7eV and 400eV400\phantom{\rule{0.3em}{0ex}}\mathrm{eV}400eV. CCC, RMPS, and Born theoretical results are also presented for both the ground and excited states of cesium and rubidium. In the low energy region (<11eV)(<11\phantom{\rule{0.3em}{0ex}}\mathrm{eV})(<11eV) where best agreement between these excited state measurements and theory might be expected, a discrepancy of approximately a factor of five is observed. Above this energy there are significant contributions to the TICS from both autoionization and multiple ionization.
An atom trapping technique for determining absolute, total ionization cross sections (TICS) out of an excited atom is presented. The unique feature of our method is in utilizing Doppler cooling of neutral atoms to determine ionization cross sections. This fluorescence-monitoring experiment, which is a variant of the “trap loss” technique, has enabled us to obtain the experimental electron impact ionization cross sections out of the Cs 6 2P3∕2 state between 7 eV and 400 eV. CCC, RMPS, and Born theoretical results are also presented for both the ground and excited states of cesium and rubidium. In the low energy region (<11 eV) where best agreement between these excited state measurements and theory might be expected, a discrepancy of approximately a factor of five is observed. Above this energy there are significant contributions to the TICS from both autoionization and multiple ionization.