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Coherent ion dip spectroscopy of the ground state benzene–Ar complex: Vibration–rotation levels up to 130 cm−1 intermolecular energy

J. Chem. Phys. 103, 3315 (1995); doi:10.1063/1.470265

Issue Date: 1 September 1995

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R. Sussmann, R. Neuhauser, and H. J. Neusser
Institut für Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85748 Garching, Germany
Coherent ion dip spectroscopy (CIS) provides high sensitivity and high resolution for the investigation of vibrational overtones in molecular electronic ground states. For a special time sequence of two coherent narrow-band Fourier transform limited nanosecond UV light pulses, with a modest delay of the pump pulse of 6.4 ns, a complete blocking of the population transfer to the upper state is achieved in the lambda-type three-level system ion dip experiment. This leads to ion dips with a depth as large as 95% and each dip represents an individual rovibronic transition. In this work, CIS is applied for the first time to a weakly bound van der Waals complex, benzene–Ar. We are able to observe six new van der Waals vibrational states up to an excess energy of 130 cm−1. The assignments are made by comparison with recent S1 excited state data of benzene–Ar and p-difluorobenzene–Ar and by analysis of the positions and intensities of the observed individual rotational lines. The frequency positions of the intermolecular vibrational states display a regular pattern up to 130 cm−1. ©1995 American Institute of Physics.
History: Received 6 March 1995; accepted 15 May 1995
Permalink: http://link.aip.org/link/?JCPSA6/103/3315/1
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KEYWORDS and PACS

Keywords
PACS
  • 31.15.Ar
    Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Ab initio calculations
  • 33.20.Tp
    Molecular properties and interactions with photons Molecular spectra Vibrational analysis
  • 34.50.Gb
    Atomic and molecular collision processes and interactions Scattering of atoms, molecules, and ions Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.)
  • YEAR: 1995

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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