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A high resolution Ultra Soft X-ray (USX) emission spectrum of gaseous benzene has been recorded. The spectrum is interpreted by means of ab initio one-center intensities and electron spectroscopic data. A comparison is made with USX spectra of solid benzene showing a uniform shift towards higher photon energies for the gas phase spectrum. The solid and gas phase USX spectra show quite different satellite structure which is interpreted in terms of photon and electron excitation of spectra.
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Nordgren et al. (1983) studied this question.
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