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We present an investigation of the Xe$_{2}$ excimer emission spectrumobserved in the near infrared range about 7800 cm$^{-1}$ in pure Xe gas and inan Ar (90%) --Xe (10%) mixture and obtained by exciting the gas with energeticelectrons. The Franck--Condon simulation of the spectrum shape suggests thatemission stems from a bound--free molecular transition never studied before.The states involved are assigned as the bound $(3)0_{u}^{+} $ state with $6p[1/2]_{0}$ atomic limit and the dissociative $(1)0_{g}^{+}$ state with $6s[3/2]_{1}$ limit. Comparison with the spectrum simulated by using theoreticalpotentials shows that the dissociative one does not reproduce correctly thespectrum features.Comment: 4 pages, 3 figures, submitted to Phys. Rev. Let

journal of physics. b, atomic molecular and optical physics/journal of physics. b, atomic, molecular and optical physics

Infrared emission spectrum and potentials of 0+uand 0+gstates of Xe2excimers produced by electron impact