2000
DOI: 10.1086/317251
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Electronic Spectrum of Propadienylidene (H2C=C=C:) and Its Relevance to the Diffuse Interstellar Bands

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Cited by 32 publications
(90 citation statements)
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“…[11][12][13][14] Attempts to measure the 1 3 Σ − u ← X 3 Σ − g transition for the smallest members HC 3 H and HC 5 H in the gas phase failed so far. Whereas the two C 3 H 2 isomers with C 2v symmetry, which are more stable, were studied, [15][16][17][18][19] arguments were given for the non-observation of the electronic transition of HC 5 H, including low oscillator strength and unfavorable production conditions. 13 Several low-energy isomers of C 5 H 2 were investigated by quantum chemistry and microwave absorption spectrosa) Electronic mail: m.steglich@web.de b) Electronic mail: j.p.maier@unibas.ch copy.…”
Section: Introductionmentioning
confidence: 99%
“…[11][12][13][14] Attempts to measure the 1 3 Σ − u ← X 3 Σ − g transition for the smallest members HC 3 H and HC 5 H in the gas phase failed so far. Whereas the two C 3 H 2 isomers with C 2v symmetry, which are more stable, were studied, [15][16][17][18][19] arguments were given for the non-observation of the electronic transition of HC 5 H, including low oscillator strength and unfavorable production conditions. 13 Several low-energy isomers of C 5 H 2 were investigated by quantum chemistry and microwave absorption spectrosa) Electronic mail: m.steglich@web.de b) Electronic mail: j.p.maier@unibas.ch copy.…”
Section: Introductionmentioning
confidence: 99%
“…8), so that both of these levels-which are also associated with non-negligible Franck-Condon activity-likely contribute to the next member of the progression. are perhaps four additional spectroscopic features: one that can be loosely associated with vibrational levels in theà 1 A 2 state some 1500 cm −1 above the strong origin band, another in the vicinity of theB 1 B 1 "origin" (and similar in general appearance to that seen in the absorption spectrum 18,19,24 ) and then two more: a moderately stronger peak that would be associated with ν 2 in theB 1 B 1 state and the associated 2ν 2 level (see Fig. 9, noting that this figure shows only the simulated spectrum and no experimental data).…”
Section: Thec 3 a 1 Statementioning
confidence: 89%
“…The lowest-energy transition,Ã 1 A 2 ←X 1 A 1 , is forbidden by symmetry, but becomes weakly allowed through vibronic coupling with theB 1 B 1 state. [17][18][19] Vibronic coupling analysis also explains the rich vibrational progression in theB 1 B 1 ←X 1 A 1 transition. 18,19 Photoexcitation into theB 1 B 1 ←X 1 A 1 transition of H 2 CCC results in equilibration (presumably via a cyclic structure) of the two carbon atoms at the terminal and central positions-a degenerate process that becomes observable through isotopic ( 13 C) labeling.…”
Section: Introductionmentioning
confidence: 88%
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