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We report new measurements of the near infrared (NIR) Xe$_2^*$ excimerfluorescence in an electron--beam--excited Ar (90%)--Xe (10 %) mixture at roomtemperature. Previous measurements up to a density $N\approx 2\times 10^{26}$m$^{-3}$ discovered a broad excimer fluorescence band at $\approx 7800$cm$^{-1},$ whose center is red--shifted by increasing $N$ (A. F. Borghesani, G.Bressi, G. Carugno, E. Conti, and D. Iannuzzi, {\em J. Chem. Phys.}, {\bf 115},6042 (2001)). The shift has been explained by assuming that the energy of theoptical active electron in the molecule is shifted by the density--dependentFermi shift and by accounting for the solvation effect due to the environment.We have extended the density range up to $N\approx 6\times 10^{26}$ m$^{-3}, $confirming the previous measurements and extending the validity of theinterpretative model. A detailed analysis of the width of the fluorescence bandgives a value of 2.85 nm for the size of the investigated excimer state. Such alarge value lends credence to the validity of the proposed explanation of theexperimental findings.Comment: 8 pages in two column format, 4 figures, submitted to European  physical Journal

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Environmental influence on the IR fluorescence of Xe2* molecules in electron beam excited Ar–Xe mixture at high density