High-resolution pulsed field ionization photoelectron–photoion coincidence study of CH4: Accurate 0 K dissociation threshold for CH3

The formation of methyl cation (CH3+) from methane (CH4) has been investigated in high resolution using the newly perfected pulsed field ionization photoelectron–photoion coincidence (PFI-PEPICO) scheme. The PFI-PEPICO data reveal that fragmentation of CH4 in high-n Rydberg states occurs at energies...

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Veröffentlicht in:	The Journal of chemical physics 1999-11, Vol.111 (18), p.8267-8270
Hauptverfasser:	Weitzel, Karl-Michael, Malow, Marcus, Jarvis, G. K., Baer, Tomas, Song, Y., Ng, C. Y.
Format:	Artikel
Sprache:	eng
Schlagworte:	ADVANCED LIGHT SOURCE ADVANCED LIGHT SOURCE ALS DISSOCIATION IONIZATION PARTICLE ACCELERATORS
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container_end_page	8270
container_issue	18
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container_title	The Journal of chemical physics
container_volume	111
creator	Weitzel, Karl-Michael Malow, Marcus Jarvis, G. K. Baer, Tomas Song, Y. Ng, C. Y.
description	The formation of methyl cation (CH3+) from methane (CH4) has been investigated in high resolution using the newly perfected pulsed field ionization photoelectron–photoion coincidence (PFI-PEPICO) scheme. The PFI-PEPICO data reveal that fragmentation of CH4 in high-n Rydberg states occurs at energies above the dissociation threshold prior to pulsed field ionization. The crossover point of the breakdown curves is found to depend strongly on the Stark field in the ion source and thus traditional simulation procedures based on such a feature for ion dissociation energy determination are not appropriate in PFI-PEPICO studies. We show that for a prompt dissociation process, the disappearance energy of the parent molecule provides an accurate measure of the 0 K ion dissociation threshold, as that for CH3+ from CH4 is 14.323±0.001 eV.
doi_str_mv	10.1063/1.480169
format	Article
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source	AIP Journals Complete; AIP Digital Archive
subjects	ADVANCED LIGHT SOURCE ADVANCED LIGHT SOURCE ALS DISSOCIATION IONIZATION PARTICLE ACCELERATORS
title	High-resolution pulsed field ionization photoelectron–photoion coincidence study of CH4: Accurate 0 K dissociation threshold for CH3
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