Infrared Fluorescence of Xe2 Molecules in beam-excited Xe Gas at high Pressure

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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 ≤λ≤ 1.8 μm. In the previously unexplored range for λ> 1.05 μm we have detected a broad continuum NIR fluorescence at λ≈ 1.3 μm that shifts towards longer wavelengths as pressure is increased up to 1.5 MPa. We believe that this continuum is produced in a way similar to the VUV continua of noble gas excimers and that the pressure-dependent shift can be explained by the interaction of the outer electron of the excimer with the gas.