Abstract

Using mass spectrometry we have confirmed that Sr2+ ions are produced from laser-populated Rydberg states by the associative ionization process Sr(5snl) + Sr(5s2) → Sr2+ + e. Dimer ion signal was detected for the 5s6d3D2 level, indicating that the binding energy of Sr2+ exceeds 0.77 eV. We have observed that under certain conditions the Rydberg states are destroyed by electron-impact ionization before an associative ionization collision can occur.

© 1978 Optical Society of America

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