Abstract
A trace concentration of SO2 near 225.7 nm has been
detected with a master-oscillator power-oscillator laser system for the
first time, to our knowledge. A photoacoustic absorption spectrum
of SO2 has been recorded on the
1
A
2–1
B
2
(π–π*) transition. Parametric dependence of the
photoacoustic signal has been investigated. A detection limit
(signal-to-noise ratio of 1) of 1.3 parts in 109 [1.3
ppbv (parts per billion by volume)] for SO2 have been
determined at 1 atmospheric pressure inside a photoacoustic
cell.
© 2001 Optical Society of America
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