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Titolo:
Photodissociation dynamics of gas-phase BrICl- and IBr2- anions
Autore:
Sanov, A; Sanford, T; Butler, LJ; Vala, J; Kosloff, R; Lineberger, WC;
Indirizzi:
Natl Inst Stand & Technol, Joint Inst Lab Astrophys, Boulder, CO 80309 USANatl Inst Stand & Technol Boulder CO USA 80309 hys, Boulder, CO 80309 USA Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 Chem & Biochem, Boulder, CO 80309 USA Univ Chicago, Dept Chem, Chicago, IL 60637 USA Univ Chicago Chicago IL USA 60637 icago, Dept Chem, Chicago, IL 60637 USA Hebrew Univ Jerusalem, Fritz Haber Res Ctr Mol Dynam, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 -91904 Jerusalem, Israel Hebrew Univ Jerusalem, Dept Chem Phys, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 -91904 Jerusalem, Israel
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 49, volume: 103, anno: 1999,
pagine: 10244 - 10254
SICI:
1089-5639(199912)103:49<10244:PDOGBA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
FEMTOSECOND PHOTOELECTRON-SPECTROSCOPY; DEPENDENT SCHRODINGER-EQUATION; STIMULATED RAMAN-SCATTERING; COHERENT VIBRATIONAL MOTION; MOLECULAR-DYNAMICS; ULTRAFAST PHOTODISSOCIATION; GEMINATE RECOMBINATION; IMPULSIVE EXCITATION; ELECTRON CORRELATION; SYMMETRY-BREAKING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Lineberger, WC Natl Inst Stand & Technol, Joint Inst Lab Astrophys, Boulder, CO 80309 USA Natl Inst Stand & Technol Boulder CO USA 80309 O 80309 USA
Citazione:
A. Sanov et al., "Photodissociation dynamics of gas-phase BrICl- and IBr2- anions", J PHYS CH A, 103(49), 1999, pp. 10244-10254

Abstract

This work is the first study of mixed trihalide anions in the gas phase. We report the photochemistry and photodissociation dynamics of BrICl- and IBr2- anions near 400 nm. For BrICl-, two major photodissociation channels yielding IBr- and ICl- products are observed. The photodissociation of IBr2- yields primarily IBr- anion products. No BrCl- and Br-2(-) fragments are formed from BrICl- and IBr2-, respectively, and the parent anions are ascribed linear [Br-I-Cl](-) and [Br-I-Br](-) structures, in agreement with ab initio calculations. The IBr- and ICl- products are produced in highly vibrationally excited states. We observe fragment vibrational coherence in femtosecond pump-probe measurements by probing nascent IBr- via its photodissociation to I- + Br. The IBr- vibrational periods observed in the photodissociation of BrICl- correspond to excitations of similar to 80% of the IBr- dissociation energy (D-o). In IBr2- dissociation, the average vibrational excitation of IBr- is 84-91% of D-o. The high degrees of vibrational excitation raise questions about the effect of the proximity to the dissociation threshold on the dynamics of coherent wave packets. We analyze these dynamics analytically and by means of wave packet simulations and observe smearing of expected wave packet revivals.

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Documento generato il 25/11/20 alle ore 04:21:29