Infrared emission spectrum and potentials of 0ᵤ+ and 0g+ states of Xe₂ excimers produced by electron impact

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We present an investigation of the Xe₂ excimer emission spectrum observed in the near infrared range about 7800 cm⁻¹ in pure Xe gas and in an Ar (90%) --Xe (10%) mixture and obtained by exciting the gas with energetic electrons. The Franck--Condon simulation of the spectrum shape suggests that emission stems from a bound--free molecular transition never studied before. The states involved are assigned as the bound (3)0ᵤ⁺ state with 6p [1/2]₀ atomic limit and the dissociative (1)0g⁺ state with 6s [3/2]₁ limit. Comparison with the spectrum simulated by using theoretical potentials shows that the dissociative one does not reproduce correctly the spectrum features.