title: Electronic spectra of radicals in a supersonic slit-jet discharge by degenerate and two-color four-wave mixing.
abstract: Four-wave mixing techniques have been used for the measurement of electronic transitions of cold transient species generated in a supersonic slit-jet discharge expansion. The origin band of the d(3)Pi(g)-a(3)Pi(u) system of C(2) and A(2)Pi(3/2)-X[combining tilde](2)Pi(3/2) electronic transition of HC(4)S were recorded. A signal-to-noise ratio of 10(4) in the spectra was achieved, resulting in detection limits of 10(10) cm(-3) for these two molecules. Application of selective two-color resonant four-wave mixing is used for the spectral assignment utilizing the double-resonance nature of the method. The combination of these techniques with a slit source proves to be a sensitive approach for the detection of transient molecules in a molecular beam discharge.
authors: Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056, Basel, Switzerland.
authors: Fabio J
authors: FJ
authors: Mazzotti
authors: Elena
authors: E
authors: Achkasova
authors: Richa
authors: R
authors: Chauhan
authors: Marek
authors: M
authors: Tulej
authors: Peter P
authors: PP
authors: Radi
authors: John P
authors: JP
authors: Maier
mesh_terms: D002244:Carbon / Q000737:chemistry; D005609:Free Radicals / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D007477:Ions; D007834:Lasers; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*; D013455:Sulfur / Q000737:chemistry
chemical_list: D005609:Free Radicals; D007477:Ions; D013455:Sulfur; D002244:Carbon; D006859:Hydrogen