title: Improvements in polarization spectroscopy based on high-frequency modulation.
abstract: Improvements are reported for trace elemental analysis by polarization spectroscopy. By using higher frequency (150 kHz) modulation and setting the polarizers off-extinction to produce a dispersion-shaped signal, linear calibration curves and a limit of detection (S/N = 2) of 2 ng/l. sodium can be obtained for solutions aspirated into a conventional flame source.
authors.affiliation: Ames Laboratory-USDOE and Department of Chemistry Iowa State University, Ames, IA 50011, U.S.A.
authors.forename: P L
authors.initials: PL
authors.lastname: Christensen
authors.forename: E S
authors.initials: ES
authors.lastname: Yeung