The EUV photoexcitation of a H2S molecule

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Abstract
Hydrogen sulfide was excited by the EUV Ne i (16.85 eV) and He i (21.22 eV) resonance lines. By using optical emission spectroscopy, the H2S+ (Ã 2A1) radical cation and the H Balmer emission were detected. The Franck–Condon factors for the H2S+ (Ã 2A1, v′2 =v→X̃ 2B1, v=2=0) progressions were estimated. It has been suggested that the H2S+ (Ã 2A1) ion at the v′2=7 vibrational level would start predissociation into H2(1Σ+g) +S+ (4Su) via the repulsive 1 4A″ potential surface. The absolute fluorescence cross sections for the H2S+ (Ã→X̃) and the H Balmer series were deduced at the Ne i and He i resonance lines.