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Titolo:
IONIC AND RYDBERG STATES OF CF3I STUDIED BY HIGH-RESOLUTION PHOTOELECTRON (ZEKE-PFI) AND RESONANCE-ENHANCED MULTIPHOTON IONIZATION SPECTROSCOPY
Autore:
MACLEOD NA; WANG S; HENNESSY J; RIDLEY T; LAWLEY KP; DONOVAN RJ;
Indirizzi:
UNIV EDINBURGH,DEPT CHEM,W MAINS RD,KINGS BLDG EDINBURGH EH9 3JJ MIDLOTHIAN SCOTLAND UNIV EDINBURGH,DEPT CHEM EDINBURGH EH9 3JJ MIDLOTHIAN SCOTLAND
Titolo Testata:
Journal of the Chemical Society. Faraday transactions (Print)
fascicolo: 18, volume: 94, anno: 1998,
pagine: 2689 - 2694
SICI:
0956-5000(1998)94:18<2689:IARSOC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENERGY PHOTOELECTRON; IONIZATION SPECTRUM; METHYL-IODIDE; CH3I; POLARIZATION; MOLECULES; REGION; CD3I;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
N.A. Macleod et al., "IONIC AND RYDBERG STATES OF CF3I STUDIED BY HIGH-RESOLUTION PHOTOELECTRON (ZEKE-PFI) AND RESONANCE-ENHANCED MULTIPHOTON IONIZATION SPECTROSCOPY", Journal of the Chemical Society. Faraday transactions (Print), 94(18), 1998, pp. 2689-2694

Abstract

Ionic and Rydberg states of CF3I have been studied using both zero kinetic energy pulsed-field ionisation (ZEKE-PFI) photoelectron and resonance-enhanced multiphoton ionisation (REMPI) spectroscopy. The groundstate of the ion ((X) over tilde E-2(3/2)) was characterised using coherent two-photon (one-colour) ZEKE-PFI spectroscopy and extended progressions in the symmetric vibrational modes, similar to those observedin the conventional He(I) photoelectron spectrum, were observed at high resolution. The [E-2(3/2)]6p Rydberg states were studied using two-and three-photon REMPI spectroscopy with linearly and circularly polarised light. This resulted in the assignment of at least three states with distinct Omega values (2, 1 and 0) with the Omega = 2 components being the most intense. The strongest members of the [E-2(3/2)]6p;2 system were used as resonant intermediates in two-colour (2 + 1') ZEKE-PFI experiments which allowed the unambiguous assignment of the majority of the vibrational structure of the intermediate states. The adiabatic ionisation energy of CF,I was determined as 83652 +/- 2 cm(-1) The vibrational structure observed for one of the SZ = 2 components of the[E-2(3/2)]6p cluster in CF3I differs considerably from that observed for the lower lying 6s states and the analogous 6p states of CH3I. In particular, nu(3) (the carbon-iodine stretch) shows a vibrational frequency substantially reduced from that of the neutral and ionic ground states. It is concluded that at least one of the [E-2(3/2)]6p states of CF3I is distorted, possibly through an interaction with an ion-pair state.

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Documento generato il 25/01/21 alle ore 19:32:39