Presented as part of a commemorative issue for Wolfgang Kiefer on the occasion of his 65th birthday.
Degenerate and two-color resonant four-wave mixing applied to the rotational characterization of high-lying vibrational states of formaldehyde (Ã, 1A2)†
Article first published online: 12 JAN 2006
Copyright © 2006 John Wiley & Sons, Ltd.
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
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
- Issue published online: 12 JAN 2006
- Article first published online: 12 JAN 2006
- Manuscript Accepted: 19 JUN 2005
- Manuscript Received: 19 MAY 2005
- Swiss Federal Office of Energy.
- Swiss National Science Foundation.
- resonant-enhanced degenerate four-wave mixing;
- two-color resonant four-wave mixing;
- vibrational excitation;
- spectral assignment;
- predissociative states
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 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 band where literature data is available for comparison. Copyright © 2006 John Wiley & Sons, Ltd.