Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)
A 10.22: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT3
Infrared Fluorescence of beam-excited Xe2 Molecules at high Pressure — •Francesco Borghesani1, Giacomo Bressi2, Gianni Carugno3, Enrico Conti3, and Davide Iannuzzi4 — 1Dipartimento di Fisica, Universita’ di Padova, Italy — 2I.N.F.N. Sez. di Pavia, Italy — 3I.N.F.N. Sez. di Padova, Italy — 4Dipartimento di Fisica Nucleare e Teorica, Universita’ di Pavia, Italy
We report experimental results of proton- and electron-beam-induced near-infrared (NIR) fluorescence in high-pressure Xe gas at room temperature. The investigated wavelength band spans the range 0.7 <l< 1.8 microns. In the previously unexplored range for l > 1.05 microns we have detected an intense and broad continuum NIR fluorescence centered about l < 1.3 microns. The NIR continuum shows a large shift towards longer wavelengths as the gas pressure is increased from 0.1 up to 3.0 MPa. We believe that this continuum has the same origin as the very well known VUV first and second continua of noble gases excimers and that the pressure-dependent shift can be easily explained in terms of the interaction of the outer Rydberg electron of the excimer with the atoms of the host gas.