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Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. VII—SO2 → O− + SO+, O− + S+ + O

✍ Scribed by Koichiro Mitsuke; Shinzo Suzuki; Takashi Imamura; Inosuke Koyano

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
429 KB
Volume
28
Category
Article
ISSN
1076-5174

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✦ Synopsis

Ion

-pair formation from photoexcitation of SO, was studied by negative-ion mass spectrometry using synchrotron radiation in the 15-35 eV photon energy range. Negative ions 0-from SO, were observed. The appearance energy in the photodissociation efficiency curve for 0-is in good agreement with the thermochemical threshold of 14.49 eV for the formation of O-(2P,) + SO+(f'rr). Three vibrational progressions in the efficiency curves are assigned as resulting from predissociation of the s-type Rydberg states converging to S 0 , + ( ~3 A , ) . The 0-efficiency rises markedly at wavelengths of 622 and 570& These onsets are attributed to formation of triplets of fragments: O-('P,) + S+('S,) + q 3 P J and O-('P,) + S+('D,) + O('P3.

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