Abstract
Pressure is a very powerful and versatile tool for studying electronic excitations. Examples are given both for delocalized (band to band) and localized excitations. The band-to-band excitations discussed here show the approach to zero energy gap for sulfur and the thallous halides. For localized excitations there is a balance between the effects of pressure on the stabilization of the bonding and destabilization of the antibonding states and, on the other hand, the increase in intensity of the Van der Waals forces. Examples are given of the various effects using a number of organic molecules and metals cluster compounds.
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