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The optical absorption and emission spectra of electron-bombarded liquid helium has been studied as a function of pressure between the saturated vapor pressure and 25 atm. The transitions of He* and He₂* in the liquid shift toward the blue with increasing pressure. The observed line profile and pressure shift of the He(2³P)←He(2³S) atomic absorption line are in good agreement with recent static line broadening calculations. We also report a strong pressure-dependent quenching of the excited atomic and molecular states in the liquid.
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Soley et al. (1974) studied this question.
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