H2S absorption in the 3.6–4-μm wavelength region is studied with a tunable diode laser spectrometer. Wavelengths, line strengths, and pressure broadening coefficients of the strongest lines and of the lines adjacent to deuterium fluoride (DF) lines are determined. With these data the absorption cross sections of H2S at 1P DF wavelengths are calculated for atmospheric conditions and compared with the absorption cross sections measured directly with a DF laser.
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Most Intense Absorption Lines of H2S in the 3.6–3.8-μm Range.
Wavelength λ (μm)
Line strength S0 (m−2 atm−1)
Peak absorption cross section (10−20 cm2)
Peak specific absorption coefficient (m−1 atm−1)
N2 pressure broadening coefficient γ0 (MHz/mbar)
3.7295
68.9
4.59
115
4.7
3.7181
63.5
4.23
106
4.4
3.7073
82.0
5.47
137
4.1
Absorption measurements made at 0.5 Torr of pure H2S with a path length of 4 m. γ0 values determined with 2.5 Torr of H2S broadened by 50, 100, 200, 300, 400, 500, 600, and 750 Torr of N2.
Table III
Comparison of H2S Absorption Coefficients Measured with a Tunable Diode and a cw DF Lasera
DF laser line
Wavelength λ (μm)
DF–H2S wave number difference Δν (GHz)
Pressure broadening coefficient λ0 (MHz/mbar)
Line strength S0 (m−2 atm−1)
Specific absorption coefficient at atmospheric pressure (m−1 atm−1)
Most Intense Absorption Lines of H2S in the 3.6–3.8-μm Range.
Wavelength λ (μm)
Line strength S0 (m−2 atm−1)
Peak absorption cross section (10−20 cm2)
Peak specific absorption coefficient (m−1 atm−1)
N2 pressure broadening coefficient γ0 (MHz/mbar)
3.7295
68.9
4.59
115
4.7
3.7181
63.5
4.23
106
4.4
3.7073
82.0
5.47
137
4.1
Absorption measurements made at 0.5 Torr of pure H2S with a path length of 4 m. γ0 values determined with 2.5 Torr of H2S broadened by 50, 100, 200, 300, 400, 500, 600, and 750 Torr of N2.
Table III
Comparison of H2S Absorption Coefficients Measured with a Tunable Diode and a cw DF Lasera
DF laser line
Wavelength λ (μm)
DF–H2S wave number difference Δν (GHz)
Pressure broadening coefficient λ0 (MHz/mbar)
Line strength S0 (m−2 atm−1)
Specific absorption coefficient at atmospheric pressure (m−1 atm−1)