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Titolo:
High resolution photoelectron (ZEKE-PFI) spectrum of IBr: the role of repulsive intermediate states
Autore:
Beattie, DA; MacLeod, NA; Lawley, KP; Donovan, RJ;
Indirizzi:
Univ Edinburgh, Dept Chem, Edinburgh EH9 3JJ, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH9 3JJ Midlothian, Scotland
Titolo Testata:
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
fascicolo: 1-2, volume: 97, anno: 1998,
pagine: 191 - 196
SICI:
0368-2048(199812)97:1-2<191:HRP(SO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
KINETIC-ENERGY EXPERIMENTS; FREE-BOUND SPECTROSCOPY; ION-PAIR STATE; RYDBERG STATES; PREDISSOCIATION LIFETIMES; COLLISIONAL ENHANCEMENT; FLUORESCENCE EXCITATION; 2-PHOTON IONIZATION; CH3I; DISSOCIATION;
Keywords:
photoelectron spectrum; iodine monobromide; two-photon ionisation; zero kinetic energy (ZEKE) photoelectron; pulsed field ionisation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Donovan, RJ Univhian,burgh, Dept Chem, Kings Bldg,W Mains Rd, Edinburgh EH9 3JJ, Midlot Univ Edinburgh Kings Bldg,W Mains Rd Edinburgh Midlothian Scotland EH9 3JJ
Citazione:
D.A. Beattie et al., "High resolution photoelectron (ZEKE-PFI) spectrum of IBr: the role of repulsive intermediate states", J ELEC SPEC, 97(1-2), 1998, pp. 191-196

Abstract

We present the high resolution two-photon one-colour photoelectron (ZEKE-PFI) spectrum of IBr excited via a repulsive intermediate state. Both spin-orbit components ((X) over tilde(2) Pi(3/2) and (X) over tilde(2) Pi(1/2)) of the ground electronic state have been observed. The adiabatic ionisation energies have been determined to be 79 018 +/- 1 cm(-1) for the (X) over tilde(2)pi(3/2) state and 83 680 +/- 1 cm(-1) for the (X) over tilde(2) Pi(1/2) state, giving a spin-orbit splitting of 4662 +/- 2 cm(-1). An extended progression allowed resolution of the vibrational isotope shift and vibrational constants have been determined for both isotopomers ((IBr)-Br-79 and (IBr)-Br-81) in the (X) over tilde(2) Pi(3/2) state: <(omega)over tilde>(e) =303 +/- 1 cm(-1) and <(omega)over tilde>(e)x(e) = 1.0 +/- 0.1 cm(-1) for (IBr+)-Br-79 and omega(e) = 300 +/- 1 cm(-1) and <(omega)over tilde>(e)x(e) = 0.9 +/- 1 cm(-1) for (IBR+)-B-81. The vibrational progression in the ((X)over tilde(2)Pi(1/2)) state extended only as far as nu(+) = 3 and, as a result, the isotope shift was not resolved. The vibrational constants for theupper spin-orbit component were determined as <(omega)over tilde>(e) = 300+/- 1 cm(-1) and <(omega)over tilde>(e)x(e) = 2.0 +/- 0.2 cm(-1). The roleof repulsive intermediate states, at the one photon level, in the formation of extended vibrational progressions, is discussed. (C) 1998 Elsevier Science B.V. All rights reserved.

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Documento generato il 22/01/21 alle ore 05:50:17