Abstract

Thermotransmission measurements have been carried out on thin, self-supported, semitransparent gold films in the 1.8–3.5-eV energy region. The results compare very favorably with the spectra of Rosei et al., taken on quartz-backed samples, showing the feasibility of extending the techniques of modulation spectroscopy into the soft x-ray region. Moreover, it is shown that the widths of the spectral features are a factor of two smaller than those obtained on films evaporated on a quartz substrate. The thermal time constant is in the range of a few milliseconds, so that a very high modulation efficiency can be obtained, even when operating at several hundred hertz.

© 1977 Optical Society of America

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