Abstract
Observed intensity fluctuations in the emission of Stark-perturbed $\mathrm{L}\mathrm{y}\ensuremath{-}\ensuremath{\beta}$ radiation, from hydrogen atoms formed by passage of hydrogen ions through carbon foils, are compared with theoretical calculations using a density-matrix formalism to yield information on the cross sections for creation into the various $l$ states. It is found, for beam energies between 250 and 500 keV/atom, that the $s$ states are preferentially populated by more than a factor of 4, compared to a statistical distribution. Similar results are also obtained for $\mathrm{L}\mathrm{y}\ensuremath{-}\ensuremath{\alpha}$ emission in electric and motional electric fields, in contrast with previous reports at lower energies. The effects of Zeeman splittings, hyperfine interaction, and fringing fields on the signal are investigated.
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