After recalling excimer properties, their main formation processes are described. Spectral and temporal characteristics of xenon spontaneous emission at 1700 A as a function of pressure (0. 6 less than equivalent to p less than equivalent to 3 B), temperature ( minus 60 less than equivalent to t less than equivalent to plus 25 degree C) and different impurities concentration were obtained. Excimer population evolution as a function of these parameters are deduced. Feasibility of an excimer Xenon laser at quasi-atmospheric pressure (p similar 2 bars) seems possible from the experimental results.