Photodissociation spectroscopy of benzene cluster ions: (C 6H6)+2 and (C6H 6)+2

Kazuhiko Ohashi, Nobuyuki Nishi

Research output: Contribution to journalArticle

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Abstract

The photodissociation of size-selected benzene cluster ions, (C 6H6 )+m + hω→ (C 6H6 )+n + (m - n) C 6H6, has been investigated in the 410-750 nm wavelength range using tunable dye laser radiation. The measurements were performed using a tandem mass spectrometer [a linear time-of-flight (TOF)/reflectron TOF] combined with multiphoton ionization (MPI) for ion preparation. Only C 6H6+ was detected as a photofragment of (C 6H6)2+ and (C6H 6)3+, while both C6H 6+ and (C6H6)2 + fragments were observed in the case of (C6H6 )4+ photodissociation. Photodissociation spectra, i.e., photofragment yield spectra as a function of wavelength, of (C6H 6)+m (m = 2,3) were obtained. Two local excitation bands of (C6H6)+m were seen in this region and assigned to the C(A2u) ← X(E 1g ) and the B(E2g) ← X(E1g) transitions of a C6H6+ unit in the clusters. The origin of the B←X transition of (C6H6)2+ and (C6H6)3+ was redshifted relative to that of C6H6+ by about 1400 and 2400 cm-+, respectively, while the C←X bands of (C6H6) 2+ and (C6H6 )3 + were seen at the same wavelengths of 440 nm. Possible structures for the cluster ions are discussed based on the spectral shifts.

Original languageEnglish
Pages (from-to)4002-4009
Number of pages8
JournalThe Journal of Chemical Physics
Volume95
Issue number6
DOIs
Publication statusPublished - Jan 1 1991

Fingerprint

Photodissociation
Benzene
photodissociation
benzene
Spectroscopy
Ions
Wavelength
wavelengths
spectroscopy
flight time
ions
Dye lasers
Mass spectrometers
Laser radiation
tunable lasers
dye lasers
mass spectrometers
Ionization
fragments
laser beams

All Science Journal Classification (ASJC) codes

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

Cite this

Photodissociation spectroscopy of benzene cluster ions : (C 6H6)+2 and (C6H 6)+2. / Ohashi, Kazuhiko; Nishi, Nobuyuki.

In: The Journal of Chemical Physics, Vol. 95, No. 6, 01.01.1991, p. 4002-4009.

Research output: Contribution to journalArticle

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