Pulsed-periodic UV emitter tunable near the main absorption maximum of a DNA molecule

The spectral characteristics of a pulsed-periodic lamp with three dielectric barriers are presented for the range 220–250 nm. As the active media of the lamp, krypton (Kr)-sulfur hexafluoride (SF$_6$) and krypton-carbon tetrachloride (CCl$_4$) mixtures are tested. The use of Kr-SF$_6$ and Kr-CCl$_4$ binary mixtures in two noncommunicating volumes is shown to be more effective than the use of a Kr-SF$_6$-CCl$_4$ ternary mixture with the same amount of Kr, SF$_6$, and CCl$_4$ constituents. The emission spectrum of the lamp near the maxima of the KrF(X-B) 248-nm and KrCl(X-B) 222-nm bands can be controlled by varying the partial pressures of halogen carriers and krypton.