Emission characteristics of a nanosecond discharge in nitrogen, inert gases and its halogenides without preionization of
the gap from an auxiliary source have been investigated. A volume discharge, initiated by an avalanche electron beam
(VDIAEB) was realized at pressures up to 12 atm. It has been shown that at VDIAEB excitation no less than 90%
energy in the 120-850 nm range is emitted by Xe, Kr, Ar dimers. Xenon spectra in the range 120-850 nm and time-amplitude
characteristics have been recorded and analyzed for various excitation regimes. In xenon at pressure of 1.2
atm, the energy of spontaneous radiation in the full solid angle was ~ 45 mJ/cm3, and the FWHM of a radiation pulse
was ~ 110 ns. The spontaneous radiation power rise in xenon was observed at pressures up to 12 atm. Pulsed power
densities of radiation of inert gases halogenides excited by VDIAEB was ~ 4.5 kW/cm2 at efficiency up to 5.5 %.
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