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Titolo:
SPECTROSCOPY AND PHOTODISSOCIATION OF SIZE-SELECTED (CH3I)(N)(+) CLUSTER IONS
Autore:
SYAGE JA; STEADMAN J;
Indirizzi:
AEROSP CORP,POB 92957,MAIL STOP M5-754 LOS ANGELES CA 90009
Titolo Testata:
International journal of mass spectrometry and ion processes
, volume: 159, anno: 1996,
pagine: 125 - 136
SICI:
0168-1176(1996)159:<125:SAPOS(>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-IMPACT IONIZATION; STATE PROTON-TRANSFER; MULTIPHOTON IONIZATION; PHOTO-DISSOCIATION; DIMETHYL SULFIDE; METHYL-IODIDE; CH3I+; DYNAMICS; CATIONS; SPECTRA;
Keywords:
MASS-SPECIFIC CLUSTER ION PHOTODISSOCIATION; PHOTODISSOCIATION CROSS-SECTIONS; ELECTRON IONIZATION/DISSOCIATION; LOW-MASS REJECTION FILTER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Syage e J. Steadman, "SPECTROSCOPY AND PHOTODISSOCIATION OF SIZE-SELECTED (CH3I)(N)(+) CLUSTER IONS", International journal of mass spectrometry and ion processes, 159, 1996, pp. 125-136

Abstract

The resonant photodissociation of (CH3I)(n)(+) cluster ions (n=1-5) was studied in a crossed molecular-electron-laser beam apparatus. Theseresults were complemented by a study of the ionization/dissociation as a function of variable energy electron ionization (EI). The fragmentation that first appears as the EI energy is raised is loss of CH3. This channel is particularly strong for n=3. The lower energy dissociation of neutral I, on the other hand, is essentially quenched for cluster sizes of n >2. Intermolecular dissociation (evaporation) of CH3I wasevident, but was not extensive, based on a minor sensitivity of the cluster ion distribution to EI energy. The photodissociation of (CH3I)(n)(+) resulted in different dissociation behavior than for Fl. Resonant excitation of monomer CH3I+ to the predissociative A electronic state gave only I+CH3+. A state excitation of the cluster ions, on the other hand, resulted only in intermolecular dissociation. The photoexcitation cross-sections for the A (2)E(1/2)<--X(2)E(1/2) transition are presented as a function of cluster size n. A two-photon dissociation channel is also identified and the crosssections and dissociation products are reported. Finally, the frequency resolved photofragment excitation spectra of CH3I+ and (CH3I)(2)(+) are compared.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 16:23:56