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Krypton gas was excited by high-current relativistic electron bursts, and spectral and temporal characteristics of the uv continuum peaked at 1460 {} were measured as functions of pressure. Gas pressure ranged from 0.14 to 68 atm. The spectral full width at half-maximum of 90±{}6 {} was virtually independent of pressure from 3.4 to 68 atm. Exponential time constants for the buildup and decay of the uv intensity obeyed a P^-1.5 pressure dependence for $P<4$ atm. Three pressure-independent intensity decay constants of 9±{}1.5, 32±{}6, and 350±{}70 nsec were obtained for $P>6$ atm. The efficiency for conversion of electron kinetic energy to uv energy was (4±{}1.6)%.
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Koehler et al. (1975) studied this question.
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