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Degenerate and two‐color resonant four‐wave mixing of C 2 − in a molecular beam environment
Author(s) -
Tulej Marek,
Knopp Gregor,
Gerber Thomas,
Radi Peter P.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2638
Subject(s) - acetylene , degenerate energy levels , mixing (physics) , ion , argon , spectroscopy , chemistry , raman spectroscopy , beam (structure) , resonance (particle physics) , analytical chemistry (journal) , supersonic speed , resolution (logic) , four wave mixing , atomic physics , optics , physics , laser , nonlinear optics , organic chemistry , quantum mechanics , thermodynamics , chromatography , artificial intelligence , computer science
In this paper, we demonstrate that degenerate and two‐color resonant four‐wave mixing spectroscopy is applicable for the sensitive and selective characterization of negative ions in a molecular beam environment. Results are shown for C $_{2}^{-}$ , which is produced by discharging a mixture of acetylene and argon prior to supersonic expansion. Substantial signal‐to‐noise ratios of ≈ 150 show that the method is generally applicable for high‐resolution optical double‐resonance spectroscopy of negative ions. A detection sensitivity for C $_{2}^{-}$ of ≈ 10 7 ions/cm 3 is estimated. Copyright © 2010 John Wiley & Sons, Ltd.