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Double ionization of 2‐butyne, 2‐pentyne, 2‐hexyne and 3‐hexyne to singlet and triplet electronic states of their dications
Author(s) -
Martin R. L.,
Jeffreys N.,
Harris F. M.,
Andrews S. R.,
Parry D. E.
Publication year - 1997
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(199712)11:18<1980::aid-rcm503>3.0.co;2-q
Subject(s) - chemistry , singlet state , ionization energy , molecule , excited state , ionization , propyne , valence (chemistry) , singlet fission , ab initio , alkyne , electronic structure , ab initio quantum chemistry methods , computational chemistry , atomic physics , triplet state , photochemistry , organic chemistry , ion , physics , catalysis
The double‐ionization energies (DIEs) of 2‐butyne, 2‐pentyne, 2‐hexyne and 3‐hexyne molecules to singlet and triplet electronic states of their dications have been measured using double‐charge‐transfer spectroscopy. Values of DIEs to the lowest singlet and triplet states of the four dications were calculated using an ab initio method and the split‐valence 3‐21G and 6‐31G basis sets. The pattern of those DIEs for the four molecules (and the previously studied propyne molecule) agree with that observed in the experimental values, thus giving an insight into the double‐ionization processes of part of the alkyne family of molecules. The spectra showed many other peaks which correspond to double ionization to electronically excited states. For 2‐butyne, the DIE values to those states calculated using a semi‐empirical form of the multiple‐scattering Xα computational method allowed the relevant electronic transition to be identified. © 1997 John Wiley & Sons, Ltd.