Abstract
High resolution diode laser spectroscopy has been applied to the detection of hydrogen sulphide at ppm levels utilizing different transitions within the region of the ν1 + ν2 + ν3 and 2ν1 + ν2 combination bands around 1.58 µm. Suitable lines in this spectral region have been identified, and absolute absorption cross sections have been determined through single-pass absorption spectroscopy and confirmed in the Doppler linewidth regime using cav- ity enhanced absorption spectroscopy (CEAS). The desire for a sensitive system potentially applicable to H2S sens- ing at atmospheric pressure has led to an investigation on suitable transitions using wavelength modulation spec- troscopy (WMS). The set-up sensitivity has been calculated as 1.73 × 10 −8 cm −1 s 1/2 , and probing the strongest line at 1576.29 nm a minimum detectable concentration of 700 ppb under atmospheric conditions has been achieved. Further- more, pressure broadening coefficients for a variety of buffer gasses have been measured and correlated to the intermolec- ular potentials governing the collision process; the H2S-H2S dimer well depth is estimated to be 7.06 ± 0.09 kJ mol −1 .
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