Energy transfer studies in krypton-xenon mixtures excited in a cooled DC discharge
Vavilov State Optical Institute, Birzhevaja Line 12, St. Petersburg, 199034
2 Uppsala University, Department of Physics, Box 530, 751 21 Uppsala, Sweden
Revised: 27 August 1999
Published online: 15 February 2000
The VUV spectrum of gaseous mixtures of krypton with a small amount of xenon added was investigated in the range 115-200 nm. The mixtures were excited in a capillary DC discharge where the capillary could be cooled by using liquid nitrogen. The mixed molecule band around the XeI resonance line at nm and the mixed molecule continuum to the long wavelength side from the line were analysed. The band around nm was identified as transitions between a weakly bound excited state and the weakly bound ground state of XeKr molecules. When cooling the capillary wall, the appearance of the Xe2 continuum was observed. The effect is ascribed to energy transfer between molecular states as a consequence of radiation trapping in the band around nm. The role of the mixed molecule in the formation of the VUV spectrum of the gas mixture is discussed and underlined.
PACS: 33.20.Ni – Vacuum ultraviolet spectra / 33.50.Hv – Radiationless transitions, quenching
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000