title: Trace analysis of rubidium hyperfine structure in a flame atomizer using sub-Doppler laser wave-mixing spectroscopy.
abstract: Nonlinear laser wave mixing is a versatile spectroscopic method for trace elemental analysis at high spectral resolution. Sub-Doppler spectral resolution allows isotope and hyperfine structure measurements of some of the elements even when using a room-pressure analytical flame (i.e., sub-Doppler but Lorentzian broadened spectra). A non-planar wave-mixing optical setup offers some advantages as compared to the conventional planar wave-mixing setup including better signal collection efficiency and easier optical alignment. Using our absorption-based wave mixing, a detection limit of 0.05 ng/mL (i.e., 50 parts-per-trillion) is reported for Rb in an air/acetylene flame, while still maintaining sub-Doppler spectral resolution for the infrared 780.0-nm Rb transition line.
authors.affiliation: Department of Chemistry, San Diego State University, San Diego, California 92182, USA.
authors.forename: Kenneth M
authors.initials: KM
authors.lastname: Weed
authors.forename: William G
authors.initials: WG
authors.lastname: Tong
mesh_terms: D000042:Absorption; D007834:Lasers; D009330:Nebulizers and Vaporizers; D012413:Rubidium / Q000032:analysis* / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods*
chemical_list: D012413:Rubidium