Photoionization Cross Sections of Helium
JOSA, Vol. 54, Issue 7, pp. 876-878 (1964)
http://dx.doi.org/10.1364/JOSA.54.000876
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Abstract
The photoionization cross sections of helium have been measured from threshold down to 260 Å. At the spectral head the cross section is found to be 7.3×10-18 cm2. The experimental results are compared to available theoretical data. The oscillator strength for transitions into the ionization continuum have been estimated from threshold to 0.01 Å using the present and previously published data. A continuum ʃ value of 1.54 is obtained. Applying the Thomas-Kuhn sum rule one therefore obtains the total oscillator strength for all discrete transitions as ʃ= 0.46.
Citation
JAMES A. R. SAMSON, "Photoionization Cross Sections of Helium," J. Opt. Soc. Am. 54, 876-878 (1964)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-54-7-876
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