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Collisional detachment of two electrons from S 2 - ions: first observation of dissociative double detachment

1992; IOP Publishing; Volume: 25; Issue: 13 Linguagem: Inglês

10.1088/0953-4075/25/13/002

1361-6455

Vidhya Krishnamurthi, D. Mathur,

Ion-surface interactions and analysis

Detachment of two electrons from S2- ions in 3 keV collisions with N2 has been studied by means of ion translational energy spectrometry. The vertical electron affinity of S2- is measured to be 1.6+or-0.2 eV. In addition to S2+ formation, dissociative double detachment is observed for the first time. Cross sections for non-dissociative and dissociative double detachment are determined to be 4.4+or-0.1*10-17 cm2 and 3.7+or-0.3*10-17 cm2, respectively.