A UV lamp based on a Kr-Xe mixture with Br2 and I2 molecules

A small-size broadband ultraviolet lamp with an emission spectrum of 206-390 nm, which is excited by a dc glow discharge, is described. The discharge was ignited in a quartz discharge tube with an inner diameter of 1.4 cm and an anode-cathode spacing of 10 cm. The tube was filled with a Kr/Xe/Br-2/I-2 working mixture, the total pressure being 0.5-2.0 kPa. The lamp's emission spectrum consisted of a 206.2-nm iodine atomic line 0.1 nm wide at half-height and a continuum in a spectral region of 210-390 nm. The continuum resulted from overlapping of wide emission bands with peaks at 221 nm for XeBr(D-X), 253 nm for XeI(B-X), 282 nm for XeBr(B-X), 289 nm for Br-2* 342 nm for I-2*, and 386 nm for IBr*. The total power of the ultraviolet emission was no more than 8-12 W. the power injected into the discharge being 10-100 W. The lamp lifetime in the gas-static mode was 300-400 h.