Abstract
A ballistic piston compressor is described which makes possible the study of gases at simultaneously extremely high values of density and temperature, under conditions of pure thermal excitation, and in the absence of external electric or magnetic fields. Calculations are presented which demonstrate the density‐temperature‐pressure relations. Preliminary results are given of a current study of density and temperature effects on spectral line width, shape, and position of a diffuse series line (4603 Å) and a sharp series line (4972 Å) of Li due to collisions with He and with Ar atoms.

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