HIGH-RESOLUTION THRESHOLD PHOTOELECTRON AND PHOTOION SPECTROSCOPY OF OXYGEN IN THE 12-50 EV PHOTON RANGE

被引:53
作者
ELLIS, K
HALL, RI
AVALDI, L
DAWBER, G
MCCONKEY, A
ANDRIC, L
KING, GC
机构
[1] LAB DYNAM MOLEC & ATOM,CNRS,F-75252 PARIS 05,FRANCE
[2] CNR,IMAI,AREA RIC ROMA,I-00016 MONTEROTONDO,ITALY
[3] UNIV PARIS 06,F-75252 PARIS 05,FRANCE
关键词
D O I
10.1088/0953-4075/27/15/017
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
High resolution threshold photoelectron and photoion spectra of the oxygen molecule have been measured in the photon energy range 12 50 eV using a penetrating field electrostatic analyser and a synchrotron radiation source. Besides the well known X 2PI(g), a 4PI(u), A 2PI(u), b 4SIGMA(g)-, B 2SIGMA(g)-, c 4SIGMA(u)- O2+ states, several other series of vibrational structure are observed in the 21-24 eV range. One series is interpreted to result, not from an ion state, but from an autoionization process involving a neutral state and the nuclear continuum of an ion state. Above 26 eV, three relatively strong features are observed at approximately 27.3 eV, 32.5 eV and 39.5 eV, interspersed with several weaker ones. Dissociation processes from some O2+ states have been studied using a threshold photoelectron-photoion coincidence technique (TPEPICO). These observations identify the weak, broad feature at 24.96 eV as the upsilon = 2 level of the C 4SIGMA(u)- state.
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页码:3415 / 3426
页数:12
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