Low Temperature Physics: 33, 532 (2007); https://doi.org/10.1063/1.2746245 (6 pages)
Thermoactivation spectroscopy of solid Ar doped with N2
A.N. Ponomaryov1, E.V. Savchenko2, G.B. Gumenchuk1, 2, I.V. Khizhniy2, M. Frankowski3, and V.E. Bondybey1, 4
1Lehrstuhl fьr Physikalische Chemie II, Technische Universitдt Mьnchen, LichtenbergstraЯe 4, Garching 85747, Germany
2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
3Fritz-Haber-Institut der Max-Planck-Geseschaft, Department of Molecular Physics, Berlin 14195, Germany
4University of California, 2135 Natural Sciences II, Irvine 2025, CA 92697, USA
Received November 20, 2006
A new modification of low-temperature activation spectroscopy technique for real-time correlated study of relaxation processes in cryogenic solids was developed. This enabled us to measure simultaneously thermally stimulated exoelectron emission (TSEE) and spectrally resolved thermally stimulated luminescence (TSL) in the range from 200 to 1100 nm. This paper presents the results on TSL and TSEE from solid Ar doped with N2 exposed to irradiation by low-energy electron beam (500 eV) during deposition. The TSEE and TSL yields were measured at the heating rate of 3.2 K/min. The emissions of molecular (A3∑u+→X1 >∑g+ transition) and atomic (2D→4S transition) nitrogen in the TSL spectra and their temperature behavior were studied. Drastic changes in the intensity distribution of the molecular progression were observed with temperature rise. In low-temperature range «hot» vibrationally unrelaxed transitions were detected in contrast to «cold» vibrationally relaxed transitions observed in «high» temperature TSL. The mechanisms of the processes resulting in TSL in whole temperature range of Ar solid occurrence are suggested.
PACS: 78.55.–m Photoluminescence, properties and materials;
Key words: relaxation processes, cryogenic solids, exoelectron emission.