Abstract
Selective regular reflection in the neighborhood of the 253.7 nm mercury resonance line was investigated in the pressure range extending up to 700 bar by applying a new technology, an internally heated autoclave with a window of synthetic sapphire. The measurements yield the maximum of spectral reflectance, which was shown to be constant up to a density of about 1018 cm−3, first to arise and then to fall off with increasing pressure. In this density range the impact theory of resonance broadening and the classical equations of anomalous dispersion are no longer valid and a statistical theory of multilateral dipole-dipole interactions should be developed to describe the reflection profiles.
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