Atmospheric water vapor absorption at 1.3 μm

S. L. Bragg; J. D. Kelley

doi:10.1364/AO.26.000506

Applied Optics
Vol. 26,
Issue 3,
pp. 506-513
(1987)
•https://doi.org/10.1364/AO.26.000506

Atmospheric water vapor absorption at 1.3 μm

S. L. Bragg and J. D. Kelley

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S. L. Bragg and J. D. Kelley, "Atmospheric water vapor absorption at 1.3 μm," Appl. Opt. 26, 506-513 (1987)

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Abstract

Absolute absorption cross sections for water vapor and water vapor/air mixtures were measured in a frequency range encompassing that of the chemically pumped atomic iodine laser. Measurements were made with a temperature-controlled multipass absorption cell and a high-resolution Fourier transform spectrometer. The measurements covered a broad range of water vapor and air pressures. Several techniques of data analysis were used, and the absorption cross section of 2 kPa of water vapor in an atmosphere of air was determined to be 1.1 ± 0.2 × 10⁻²⁴ cm². In this paper, an expression is derived which allows estimation of the absorption cross section for any pressure of water vapor and air.

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Run no.	P_H₂O (total)		Isotopic composition	P_air		Path length (m)	T (K)	No. of scans	Resolution (cm⁻¹)	Comments
Run no.	(kPa)	(Torr)	Isotopic composition	(kPa)	(Torr)	Path length (m)	T (K)	No. of scans	Resolution (cm⁻¹)	Comments
1	1.5	11	Natural	—	—	88.4	333	38	0.015
2	2.1	16	Natural	—	—	88.4	311	33	0.0096
3	2.9	22	Natural	—	—	88.4	333	36	0.015
4	3.7	28	Natural	—	—	88.4	311	33	0.012
5	5.0	37	Natural	—	—	88.4	333	34	0.015
6	3.1	23	Natural	64	483	84.4	333	37	0.015
7	2.7	20	Natural	102	767	84.4	333	35	0.015
8			0.85 H₂O	39	290	84.4	299	34	0.015	Isotopically enriched
			0.14 HDO
			0.007 D₂O
9	1.5	11	0.21 H₂O	73	546	84.4	299	44	0.023	Isotopically enriched
			0.48 HDO
			0.31 D₂O
10	2.1	16	0.18 H₂¹⁸O	79	593	84.4	299	35	0.023	Isotopically enriched
			0.82 H₂¹⁶O
11	1.7	13	Natural	—	—	0.42	301	22	0.0096	Calibration cell for spectroscopic H₂O pressure determination

		Pressure (spectroscopic)		Pressure (manometer)

Run no.	Cell T (°C)	(kPa)	(Torr)	(kPa)	(Torr)
3	60	3.0 ± 0.5	22 ± 4	2.8	21
4	38	3.7 ± 0.2	28 ± 2	4.0	30
5	60	5.0 ± 0.8	38 ± 6	4.9	37
6	60	3.4 ± 0.8	25 ± 6	3.1	23
7	60	2.8 ± 0.6	21 ± 5	2.7	20

Run no.	P_H₂O (kPa)	P_air (kPa)	T (K)	σ_D (cm²)(b)	σ_V (cm²)	σ_S (cm²)
1	1.5	—	333	2.5 (± 2.0) × 10⁻²⁵	1.0 × 10⁻²⁵	0.7 × 10⁻²⁵
2	2.1	—	311	3 × 10⁻²⁵	1.3 × 10⁻²⁵	1.1 × 10⁻²⁵
3	2.9	—	333	3 × 10⁻²⁵	1.4 × 10⁻²⁵	1.3 × 10⁻²⁵
4	3.7	—	311	3.5 × 10⁻²⁵	1.9 × 10⁻²⁵	1.8 × 10⁻²⁵
5	5.0	—	333	3 × 10⁻²⁵	2.3 × 10⁻²⁵	2.3 × 10⁻²⁵(c)
6	3.1	64	333	7 × 10⁻²⁵	9.5 × 10⁻²⁵	8.8 × 10⁻²⁵
7	2.7	102	333	9 × 10⁻²⁵	12 × 10⁻²⁵	13 × 10⁻²⁵
8	1.1(a)	39	299	10 × 10⁻²⁵	7.5 × 10⁻²⁵	5.6 × 10⁻²⁵
10	1.7(a)	79	299	11 × 10⁻²⁵	8.6 × 10⁻²⁵	11 × 10⁻²⁵

Line center frequency (cm⁻¹)	Percent contribution to 7603.14 cm⁻¹ absorption
7602.35	55
7602.82	15
7603.32(a)	10
7603.58	1.5
7605.00	8
7605.80	4
All other lines	~ 6

Run no.	P_H₂O (total)		Isotopic composition	P_air		Path length (m)	T (K)	No. of scans	Resolution (cm⁻¹)	Comments
Run no.	(kPa)	(Torr)	Isotopic composition	(kPa)	(Torr)	Path length (m)	T (K)	No. of scans	Resolution (cm⁻¹)	Comments
1	1.5	11	Natural	—	—	88.4	333	38	0.015
2	2.1	16	Natural	—	—	88.4	311	33	0.0096
3	2.9	22	Natural	—	—	88.4	333	36	0.015
4	3.7	28	Natural	—	—	88.4	311	33	0.012
5	5.0	37	Natural	—	—	88.4	333	34	0.015
6	3.1	23	Natural	64	483	84.4	333	37	0.015
7	2.7	20	Natural	102	767	84.4	333	35	0.015
8			0.85 H₂O	39	290	84.4	299	34	0.015	Isotopically enriched
			0.14 HDO
			0.007 D₂O
9	1.5	11	0.21 H₂O	73	546	84.4	299	44	0.023	Isotopically enriched
			0.48 HDO
			0.31 D₂O
10	2.1	16	0.18 H₂¹⁸O	79	593	84.4	299	35	0.023	Isotopically enriched
			0.82 H₂¹⁶O
11	1.7	13	Natural	—	—	0.42	301	22	0.0096	Calibration cell for spectroscopic H₂O pressure determination

Abstract

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Figures (5)

Tables (4)

Equations (14)

Applied Optics