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Penning ionization: In benzene · Ar and fluorobenzene · Ar van der waals molecules and in collisions of benzene with metastable Ar atoms

✍ Scribed by E. Rühl; P. Bisling; B. Brutschy; K. Beckmann; O. Leisen; H. Morgner

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 506 KB
Volume: 128
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80664-9

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✦ Synopsis

The photoion efficiency curves of the van der Waals complexes benzene. Ar (J&z* Ar) and fluorobenzene~ Ar (Fb . Ax) exhibit sharp resonances, which correspond to excitation to the Ar 2P3f2 4s and 2P~/2 4s resonance states. The peaks are redshifted relative to their ~ptoti~ values IBzsAr, AlC = -70 * 10 meV; Fb. Ar, AI3 = -40 f 10 meV). These fmdings 8re supported by electron spectroscvpy studies of the Perming ionization of benzene by state-selected me&&able Ar (%J, 90) atoms. Strong evidence is presented that Penning ionization is the process observed in both cases.

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Photoionization processes of the van der WaaIs molecules (O&, (02)3, and ArO,, produced in a supersonic expansion were s&died in the 50-100 nm region of synchrotron radiation using mass spectrometry. In the photoionization efficiency (PIE) curves, a large number of autoionization structures of O2 in