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Titolo:
Feshbach states of the propadienylidene anion H2CCC-
Autore:
Tulej, M; Guthe, F; Pachkov, MV; Tikhomirov, K; Xu, R; Jungen, M; Maier, JP;
Indirizzi:
Univ Basel, Inst Phys Chem, CH-4056 Basel, Switzerland Univ Basel Basel Switzerland CH-4056 ys Chem, CH-4056 Basel, Switzerland
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 21, volume: 3, anno: 2001,
pagine: 4674 - 4678
SICI:
1463-9076(2001)3:21<4674:FSOTPA>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIFFUSE INTERSTELLAR BANDS; DIPOLE-BOUND-STATES; AUTODETACHMENT SPECTROSCOPY; NEGATIVE-IONS; GAS-PHASE; PHOTODETACHMENT SPECTROSCOPY; ELECTRONIC-SPECTRA; BASIS-SETS; C3H2; TRANSITIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Maier, JP Alstom Switzerland Ltd, CH-5405 Baden, Switzerland Alstom Switzerland Ltd Baden Switzerland CH-5405 , Switzerland
Citazione:
M. Tulej et al., "Feshbach states of the propadienylidene anion H2CCC-", PHYS CHEM P, 3(21), 2001, pp. 4674-4678

Abstract

The absorption spectra of the propadienylidene anions, H2CCC- and D2CCC-, in the visible and near-UV range were recorded by photodetachment spectroscopy. The lowest excited state is the well characterized dipole bound (A) over tilde (2)A(1) showing bound levels and vibrational Feshbach resonances. The higher lying electronic states are Feshbach resonances 0.5-2 eV above the electron detachment threshold and are assigned to the (B) over tilde (2)A", (C) over tilde (2)A(1) and (D) over tilde B-2(1) <-- <(X)over tilde> B-2(1) electronic transitions by means of ab initio calculations. The autodetachment rate increases with energy. A comparison of the laboratory data with diffuse interstellar bands shows that not only the four strong transitions of the (A) over tilde (2)A(1) <-- <(X)over tilde>B-2(1) system but also several of the Feshbach resonances lie close to astronomical absorptions.

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Documento generato il 29/03/20 alle ore 01:56:46