Propensity Rule for Novel Selective Double Photoexcitation of Helium Atoms in Strong Static Electric Fields

Xiao-Min Tong, C. D. Lin
(Physics Department, Kansas State University, Manhattan, KS 66506)

We studied the double photoexcitation spectra of helium in a strong DC electric field and compared the results with the recent experimental data of Harries et al.\ [Phys. Rev. Lett. 90, 133002 (2003)]. We derived the propensity rules based on the crossing or non-crossing of energies in the Stark Map to predict the selective subset of doubly excited states that are preferentially populated in such experiments. It is shown that the propensity rule is a consequence of the ubiquitous correlation properties of doubly excited states in general.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to DAMOP, May 2004 in Tucson, AZ.

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