Absorption of H<sub>2</sub>S at DF laser wavelengths

Peter Pokrowsky

doi:10.1364/AO.22.002221

Applied Optics
Vol. 22,
Issue 14,
pp. 2221-2223
(1983)
•https://doi.org/10.1364/AO.22.002221

Absorption of H₂S at DF laser wavelengths

Peter Pokrowsky

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Peter Pokrowsky, "Absorption of H₂S at DF laser wavelengths," Appl. Opt. 22, 2221-2223 (1983)

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Abstract

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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DF laser line	Wave numbera ν (m⁻¹)	Specific absorption coefficient α* (m⁻¹ atm⁻¹)
1P5	2792.434	<0.03
1P6	2767.968	0.33
1P7	2742.998	0.18
1P8	2717.539	0.17
1P9	2691.607	0.25
1P10	2665.219	<0.03
1P11	2638.392	<0.03
1P12	2611.20	<0.03
1P13	2583.45	0.12
2P3	2750.094	0.04
2P4	2727.309	0.16
2P5	2703.999	0.20
2P6	2680.179	0.69
2P7	2655.863	0.19
2P8	2631.068	0.45
2P9	2605.807	0.05
2P10	2580.097	0.16
2P11	2553.953	<0.03
3P7	2570.523	0.18
3P8	2546.375	0.04
3P9	2521.770	<0.03

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

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)
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)	$α_{calc}^{*}$	$α_{exp}^{*}$
1P5	3.581	≫10			<0.01	<0.03
1P6	3.613	−1.5	3.2	7.29	0.23	0.33
1P7	3.646	−1.5	4.4	6.24	0.22	0.18
1P7	3.646	+2.0	4.0	1.80	0.14	0.17
1P8	3.680	−5.5	7.6	9.7	0.14	0.17
1P8	3.680	+7.7	6.3	14.5	0.21	0.25
1P9	3.715	−053	3.7	4.34	0.21	0.25
1P10	3.752	≫10			<0.01	<0.03
1P1	3.790	≫10			<0.01	<0.03
1P12	3.830	≫10			<0.01	<0.03
1P13	3.871	−1.5	4.1	3.95	0.12	0.12

DF laser line	Wave numbera ν (m⁻¹)	Specific absorption coefficient α* (m⁻¹ atm⁻¹)
1P5	2792.434	<0.03
1P6	2767.968	0.33
1P7	2742.998	0.18
1P8	2717.539	0.17
1P9	2691.607	0.25
1P10	2665.219	<0.03
1P11	2638.392	<0.03
1P12	2611.20	<0.03
1P13	2583.45	0.12
2P3	2750.094	0.04
2P4	2727.309	0.16
2P5	2703.999	0.20
2P6	2680.179	0.69
2P7	2655.863	0.19
2P8	2631.068	0.45
2P9	2605.807	0.05
2P10	2580.097	0.16
2P11	2553.953	<0.03
3P7	2570.523	0.18
3P8	2546.375	0.04
3P9	2521.770	<0.03

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

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Applied Optics