Setup scheme: turbomolecular pump (1); scroll pump (2); vacuum valve (3); Pirani pressure gauge (4); ultrahigh vacuum valves (5); Barocell pressure gauge (6); stainless steel cylinders with finger (7); high vacuum valves (8); purification chamber (9); stainless steel cylinder (10); experimental cell located inside of cryostat (11).
Experimental cell: sapphire tube (1); bottom flange (2); upper flange (3); stainless steal flat spring for thermal expansion compensation (4); Caprolan insulator (5); anode surface (6); mesh grid (7); the position of zinc cathode inside of Macor gasket (8); high-voltage feedthrough (9).
Photos of different regimes of electron current through solid xenon at constant grid-anode voltage, , and different cathode-grid voltages, : a) (no current); b) (only spark); c) (uniform discharge); d) (weak glow).
Oscillograms of visible emission intensities in a) “spark” regime, time scale /div, and b) discharge regime, time scale /div.
Overall spectra of solid xenon in visible (a) and UV (b) regions. No correction for the spectral sensitivity of the photomultipliers has been made. The Xe crystal was kept in equilibrium with its vapor at , and thus the cathode-grid gap was filled by xenon with a pressure of around . The width of individual lines registered at low monochromator scanning rate was .
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