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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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Molecules with four, five or seven atoms

Molecules with four, five or seven atoms

(p.83) Chapter 4 Molecules with four, five or seven atoms
Double Photoionisation Spectra of Molecules

John H. D. Eland

Raimund Feifel

Oxford University Press

Double photoionisation spectra of NH3, C2H2, HCHO, C2N2, PCl3, CH4, the methyl halides CH3F, CH3Cl, CH3I, the methylene halides CH2Cl2, CH2Br2, CH2I2, the carbon tetrahalides CF4, CCl4, CBr4, germanium tetrahalides GeCl4, GeBr4, and SF6 are presented with analysis to identify the electronic states of the doubly charged ions. The effects of indirect double ionisation pathways are discussed. There are relatively few important molecules with just four atoms, but most of the ones included here are present and sometimes abundant in planetary and astrophysical environments. The range of five-atom molecules includes methane and all its simple derivatives. Where possible closely related molecules are grouped together in this chapter, as much of the discussion of their electronic structure is the same for all members of a group. This chapter also includes SF6 as a closely related molecule, even though its atom count goes beyond those of some molecules in later chapters.

Keywords:   double ionisation, NH3, C2H2, HCHO, cyanogen, PCl3, CH4, methyl halides, methylene halides, CCl4

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