Improvements in polarization spectroscopy based on high-frequency modulation.
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.
Christensen
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PL
Ames Laboratory-USDOE and Department of Chemistry Iowa State University, Ames, IA 50011, U.S.A.
Yeung
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ES