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Mass spectrometric and coincidence studies of double photoionization of small molecules (1986)

Eland, J. H. D. ; Wort, F. S. ; Lablanquie, P. ; [et al.]

Springer

The European physical journal 4 (1986), S. 31-42

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ISSN: 1434-6079

Keywords: 33.20.Rm ; 33.80.Eh ; 33.80.Gj

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Current and future coincidence techniques in the study of double and multiple ionization by photon impact are reviewed. New results are presented on the formation of Xe+, Xe2+ and Xe3+ in the region of 4d −1 ionization and the triple ionization mechanism is discussed. The thresholds for Xe2+ and Xe3+ are determined as 33.05±0.3 and 64.1±0.3 eV respectively. Triple ionization of a molecule (OCS) followed by fragmentation into three cations is demonstrated for the first time. The formation and charge separation reactions of several molecular double cations are examined by coincidence techniques: intramolecular isotope effects, rearrangement reactions and slow dissociations are shown to occur in triatomic and other small doubly charged molecular ions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01432496

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Charge separation reactions of doubly charged benzene ions (1986)

Richardson, P. J. ; Eland, J. H. D. ; Lablanquie, P.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 21 (1986), S. 289-294

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ISSN: 0030-493X

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Photoion-photoion coincidence spectra of benzene and benzene-d6 photoionized by He(II) light and synchrotron radiation show the existence of six major and eight minor charge-separation reactions of the [C6H6]2+ ion. Three main groups of ion pairs are related to [C3H3]+ + [C3H3]+, [C2H3]+ + [C4H3]+ and [CH3]+ + [C5H3]+, with appearance energies of 32.2 ± 0.5 eV, 31.3 ± 0.5 eV and 28.4 ± 0.3 eV. The kinetic energy release is the same for all pairs within a group, irrespective of hydrogen number, but differs from group to group. Results are interpreted in terms of fast, direct charge separation of [C6H6]2+, and subsequent hydrogen loss by the singly charged fragments.

Additional Material: 5 Ill.