Abstract
The absolute photoabsorption cross sections, σ t, of CH 4 and n-C 4H 10 have been measured in the photon energy range of the valence electrons using a double ionization chamber equipped with a metallic thin film window and synchrotron radiation as a continuous-wavelength light source. The absolute photoionization quantum yields, η, of CH 4 have been also measured, from which the photoionization cross sections, σ i, and neutral-dissociation cross sections, σ d, are obtained. The values of σ t and η of C 1–C 4 normal alkanes including our previous results for C 2H 6 and C 3H 8 have been compared in detail with those by the dipole-simulation method using the virtual photons. The gross features of the σ t and η values of these alkanes are discussed in terms of those as functions of the photon energy and the number of C atoms in an alkane molecule.
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More From: Journal of Electron Spectroscopy and Related Phenomena
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