Vibration-dependent photoelectron angular distributions and branching ratios observed across the Cooper-minimum region of bromobenzene

被引:3
|
作者
Powis, Ivan [1 ]
Patanen, Minna [2 ,4 ]
Antonsson, Egill [2 ,5 ]
Nicolas, Christophe [2 ]
Miron, Catalin [2 ,6 ]
Holland, David M. P. [3 ]
机构
[1] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England
[2] Synchrotron SOLEIL, BP 48, F-91192 Gif Sur Yvette, France
[3] Daresbury Lab, Warrington WA4 4AD, Cheshire, England
[4] Univ Oulu, Nano & Mol Syst Res Unit, Mol Mat Res Commun, Fac Sci, POB 3000, Oulu, Finland
[5] Free Univ Berlin, Inst Chem & Biochem Phys & Theoret Chem, Takustr 3, D-14195 Berlin, Germany
[6] Horia Hulubei Natl Inst Phys & Nucl Engn, ELI NP, 30 Reactorului St, RO-077125 Magurele, Jud Ilfov, Romania
关键词
FRANCK-CONDON BREAKDOWN; MOLECULAR PHOTOIONIZATION; DYNAMICS; SHELL; SPECTRUM; N-2;
D O I
10.1103/PhysRevA.96.013413
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Vibrational state-resolved photoelectron anisotropy parameters, beta, for the (X ) over tilde B-2(1), (B) over tilde B-2(2), and (C) over tilde B-2(1) state ionizations of bromobenzene have been recorded at photon energies ranging from 20.5 to 94 eV, thus spanning the region of the expected bromine Cooper minimum (CM). The (X) over tilde state displays no CM and its beta value is also independent of vibrational level, in accord with the Franck-Condon approximation. The (B) over tilde and (C) over tilde state beta values display the CM to differing degrees, but both show a vibrational dependence that extends to energies well below the obvious CM dip. Calculations are presented that replicate these observations. We thus demonstrate a wide-ranging Franck-Condon approximation breakdown detected in the beta anisotropy parameter in the absence of any resonance. Measured and calculated vibrational branching ratios for these states are also presented. Although the (B) over tilde state branching ratios remain constant, in accord with Franck-Condon expectations, the (X) over tilde and (especially) the (C) over tilde state ratios display weak, quasilinear variations across the studied range of photon energy, but with no apparent correlation with the CM position.
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页数:8
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