Photodissociation dynamics of (C6H6)2 +

Kazuhiko Ohashi, Nobuyuki Nishi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Photodissociation of (C6H6)2 + is studied with photon energies between 1.29 and 2.81 eV. Massselected ion beam of (C6H6)2 + is photodissociated by a pulsed laser beam in the field-free region of a reflectron-type time-of-flight mass spectrometer. The average relative translational energy, 〈εt〉, and the angular distributions of the photofragments (C6H6 + and C6H 6) are measured as a function of photon energy. With a photon energy of 2.81 eV, the (C6H6)2 + ions are promoted to a bound upper state correlated to C6H6 +(ππ) + C6H6(X). Only a small fraction (≈3%) of the available energy is partitioned into the translational energy of the fragments and the product angular distribution is isotropic. Absorption of a photon in the range of 1.29-2.14 eV induces a charge resonance transition to a repulsive upper state which correlates to C6H6 +(X) + C6H6(X). The observed values for 〈εt〉 are at most 10% of the available energy, although the statistical phase space calculation shows that the complete randomization of the available energy is not achieved. As the photoexcited (C 6H6)2 + moves apart on the dissociative potential surface, ≈90% of the available energy flows into the intramolecular modes of the fragments. The energy partitioning becomes almost statistical regardless of the photoexcitation to a dissociative state.

Original languageEnglish
Pages (from-to)390-398
Number of pages9
JournalThe Journal of Chemical Physics
Volume98
Issue number1
DOIs
Publication statusPublished - Jan 1 1993

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Photodissociation
photodissociation
Photons
Angular distribution
energy
Photoexcitation
Mass spectrometers
Pulsed lasers
Ion beams
Laser beams
photons
Ions
angular distribution
fragments
photoexcitation
mass spectrometers
pulsed lasers
ion beams
laser beams

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Photodissociation dynamics of (C6H6)2 + . / Ohashi, Kazuhiko; Nishi, Nobuyuki.

In: The Journal of Chemical Physics, Vol. 98, No. 1, 01.01.1993, p. 390-398.

Research output: Contribution to journalArticle

Ohashi, Kazuhiko ; Nishi, Nobuyuki. / Photodissociation dynamics of (C6H6)2 + In: The Journal of Chemical Physics. 1993 ; Vol. 98, No. 1. pp. 390-398.
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