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Double Photoionisation Spectra of Molecules$
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John Eland and Raimund Feifel

Print publication date: 2017

Print ISBN-13: 9780198788980

Published to Oxford Scholarship Online: March 2018

DOI: 10.1093/oso/9780198788980.001.0001

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Conjugated and aromatic molecules

Conjugated and aromatic molecules

(p.113) Chapter 5 Conjugated and aromatic molecules
Double Photoionisation Spectra of Molecules

John H. D. Eland

Raimund Feifel

Oxford University Press

In the vast majority of conjugated and aromatic molecules, the outermost occupied orbitals are either of π‎ character or non-bonding lone pairs belonging to heteroatoms. These are the orbitals from which double ionisation gives rise to most of the distinct bands that can be discerned in their spectra. Double photoionisation spectra of ethylene, butadiene, pyrrole, furan, thiophene, benzene, hexafluorobenzene, toluene, pyridine, pyrazine, pyrimidine, pyridazine, naphthalene, azulene, quinoline, biphenyl, TDME, iron pentacarbonyl, ferrocene, and TMPPD are presented with analysis where possible. The effects of inner valence Auger effects are also emphasised, which can greatly increase the intensity of double photoionisation. In this chapter, the molecules are ordered mainly in the usual way by number of atoms, then by molecular weight, but the authors have put closely related molecules together where possible.

Keywords:   double ionisation, conjugated molecules, aromatic molecules, ethylene, butadiene, pyrrole, benzene, toluene, pyridine, pyrimidine

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