Institution: | (1) Solid State Spectroscopy, Ruhr University Bochum, 44780 Bochum, Germany;(2) Institute of Physics, University of Münster, 48149 Münster, Germany;(3) Austrian Research Centers GmbH-ARC, 2444 Seibersdorf, Austria;(4) UFR Sciences, Lab. Thermophysique, UTAP- LPT, University of Reims, 51687 Reims, France |