Research Article

Degenerate and two-color resonant four-wave mixing applied to the rotational characterization of high-lying vibrational states of formaldehyde (Ã, 1A2)†

  1. M. Tulej,
  2. M. Meisinger,
  3. G. Knopp,
  4. A. M. Walser,
  5. P. Beaud,
  6. T. Gerber,
  7. P. P. Radi*

Article first published online: 12 JAN 2006

DOI: 10.1002/jrs.1438

Issue

Journal of Raman Spectroscopy

Journal of Raman Spectroscopy

Special Issue: Commemorative Issue: for Wolfgang Kiefer on the Occasion of his 65th Birthday

Volume 37, Issue 1-3, pages 376–383, January - March 2006

Additional Information

How to Cite

Tulej, M., Meisinger, M., Knopp, G., Walser, A. M., Beaud, P., Gerber, T. and Radi, P. P. (2006), Degenerate and two-color resonant four-wave mixing applied to the rotational characterization of high-lying vibrational states of formaldehyde (Ã, 1A2). J. Raman Spectrosc., 37: 376–383. doi: 10.1002/jrs.1438

Author Information

  1. Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

*Department General Energy, Paul Scherrer Institute, 5232 Villigen.

  1. †

    Presented as part of a commemorative issue for Wolfgang Kiefer on the occasion of his 65th birthday.

Publication History

  1. Issue published online: 12 JAN 2006
  2. Article first published online: 12 JAN 2006
  3. Manuscript Accepted: 19 JUN 2005
  4. Manuscript Received: 19 MAY 2005

Funded by

  • Swiss Federal Office of Energy.
  • Swiss National Science Foundation.

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Keywords:

  • resonant-enhanced degenerate four-wave mixing;
  • two-color resonant four-wave mixing;
  • formaldehyde;
  • double-resonance;
  • vibrational excitation;
  • spectral assignment;
  • predissociative states

Abstract

Degenerate and two-color resonant four-wave mixing techniques (DFWM and TC-RFWM) are applied to determine rotational constants of high-lying vibrational levels in the first excited singlet state Ã(1A2) of formaldehyde. It has been demonstrated that the sensitivity of the spectroscopic technique is applicable to the low-density environment of a supersonic molecular beam and to predissociating transitions displaying low fluorescence quantum yield. In addition, we take advantage of the superior selectivity of the double-resonance method, TC-RFWM, to isolate and assign transitions in the congested region of the (one-color) DFWM spectra. The line positions of 25 well-isolated transitions are determined in the equation image band and yield the rotational constants A, B, C and the origin νe. The accuracy of the constants is determined by performing the same procedure for the equation image band where literature data is available for comparison. Copyright © 2006 John Wiley & Sons, Ltd.

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