Stark-modulation-enhanced FM-spectroscopy

Year: 1999

Authors: Werle P., Lechner S.

Autors Affiliation: Fraunhofer Institut IFU, Krenzeckbahnstr. 19, D-82467, Garmisch-Partenkirchen, Germany

Abstract: Diode lasers are a versatile tool for fundamental atomic and molecular spectroscopy and have increasing applications in gas analysis and diagnostics. In order to obtain quantum limited performance, the problem of the suppression of time-dependent unwanted background structures superimposed to the desired signal from the spectral feature under investigation has to be addressed. Sample modulation enhanced FM-spectroscopy as described in this paper combines laser frequency modulation (FM) with a sample modulation, based on the Stark effect in molecular spectra. The transitions 110-111 at 1746.2 cm-1 and 533-432 at 1759.9 cm-1 in the v2-band of H2CO have been used in experiments with static and AC electric fields up to 2 kV cm-1. An intercomparison of the FM technique and the FM-Stark double modulation scheme demonstrates the remarkable potential of this technique for background suppression.

Journal/Review: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

Volume: 55 (10)      Pages from: 1941  to: 1955

More Information: Bayerisches Staatsministerium für Wirtschaft, Infrastruktur, Verkehr und Technologie, StMWi. – The authors want to thank Robert Mücke and Robert Kormann for stimulating discussions and Bernd Jänker for the help with the design of the Stark-cell. We also want to acknowledge the support of Prof. R. Niessner from the Technical University Munich. This work has been funded by the Bayerische Staatsministerium für Wirtschaft, Verkehr und Technologie.
KeyWords: Absorption spectroscopy; Electric field effects; Formaldehyde; Frequency modulation; Light modulation; Molecular spectroscopy; Spectroscopy, Sample modulation; Stark effect; Stark modulation enhanced frequency modulation spectroscopy; Tunable diode laser absorption spectroscopy, Semiconductor lasers
DOI: 10.1016/S1386-1425(99)00067-0

Citations: 12
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