Two-body dissociation of C3H4 isomers investigated by 50 keV/u Ne8+ impact

The fragmentation of two isomers of C3H4, propyne (CH3CCH) and allene (CH2CCH2), is investigated by 50 keV/u Ne8+ impact. Obvious isomer effects are observed by comparing the time-of-flight spectra generated from the two isomers. Six two-body fragmentation channels of C3H4    2+ dications are identi...

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Veröffentlicht in:The Journal of chemical physics 2019-04, Vol.150 (14), p.144311-144311
Hauptverfasser: Li, Yutian, Xu, Shenyue, Guo, Dalong, Jia, Shaokui, Jiang, Xiaojuan, Zhu, Xiaolong, Ma, Xinwen
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Sprache:eng
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Zusammenfassung:The fragmentation of two isomers of C3H4, propyne (CH3CCH) and allene (CH2CCH2), is investigated by 50 keV/u Ne8+ impact. Obvious isomer effects are observed by comparing the time-of-flight spectra generated from the two isomers. Six two-body fragmentation channels of C3H4    2+ dications are identified for each isomer. CH2   + + C2H2   + is found to be the most favored CC bond breaking channel for both isomers, indicating that CH3CCH2+ intends to rearrange to the structure containing the CH2 group before fragmentation. For CH bond breaking channels, it is found that the CH3CCH which contains a CH3 group is more efficient for H2   + and H3   + ejection. In addition, two-body dissociation channels of C3H4   3+ trications are identified. While the H+ + C3H3   2+ channel is observed in the fragmentation of both isomers, the H2   + + C3H2   2+ channel only occurs in the fragmentation of CH3CCH3+. For CH2CCH2   3+, the peak and shoulder structures in the kinetic energy release spectrum of the H+ + C3H3   2+ channel are attributed to different geometries of the C3H3   2+ product.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5097413