Photon energy dependence of ionization-excitation in helium at medium energies

• We have measured the photoionization-excitation-to-photoionization ratio for He(+)nl (n = 2-6) at several photon energies from 90 to 900 eV. By extrapolating these values we could determine the asymptotic high-energy ratios for He(+)nl (n = 2-5) which agree with theoretical predictions. We show that the satellite-to-main-line ratios are consistent with experimental double-to-single photoionization ratios and agree well with recent measurements.

Nyckelord

PHOTOIONIZATION CROSS-SECTIONS

PHOTOELECTRON SATELLITES

ANGULAR-DISTRIBUTIONS

THRESHOLD

IMPACT

HE

HE+(N=2)

SPECTRUM

ATOMS

NEON

NATURAL SCIENCES

NATURVETENSKAP

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