Valence band photoelectron spectroscopy of liquid silicon has been performed by using a new technique based on laser pulse heating, which has been developed for measuring strongly evaporating systems under ultrahigh vacuum conditions. Such measurements show that liquid silicon is close to a free-electron metal except for a distinct dip in the middle of the spectrum at 5.3 eV binding energy.
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Gantner et al. (1995) studied this question.
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