Open AccessA CAVITY RINGDOWN SPECTROSCOPY MERCURY CONTINUOUS EMISSION MONITOR
Author(s) -
Christopher C. Carter
Publication year - 2002
Language(s) - English
Resource type - Reports
DOI - 10.2172/804179
Subject(s) - mercury (programming language) , spectrometer , hyperfine structure , spectroscopy , laser linewidth , chemistry , analytical chemistry (journal) , emission spectrum , isotope , flue gas , spectral line , laser , atomic physics , optics , environmental chemistry , physics , nuclear physics , quantum mechanics , astronomy , computer science , programming language , organic chemistry
Work on the Cavity Ring-Down (CRD) mercury spectrometer this past quarter concentrated on the actual detection of mercury and the beginning of flue gas interference testing. After obtaining the initial mercury signal detection was done at various pressures and concentrations. The Alexandrite laser system used for the CRD spectrometer has a narrow enough linewidth to spectrally resolve the isotopic structure of mercury. This includes both isotopic frequency shifts as well as hyperfine splittings due to a couple of the odd isotopes of mercury. Initial flue gas inteferent testing concentrated on SO{sub 2}, which is expected to cause the greatest interference with mercury detection due to its absorption of ultra-violet light in the same region as that of the mercury atomic line