Effects of oxygen addition on pressure-broadened water-vapor absorption in the 10-μm region

R. J. Nordstrom; M. E. Thomas; J. C. Peterson; E. K. Damon; R. K. Long

doi:10.1364/AO.17.002724

Applied Optics
Vol. 17,
Issue 17,
pp. 2724-2729
(1978)
•https://doi.org/10.1364/AO.17.002724

Effects of oxygen addition on pressure-broadened water-vapor absorption in the 10-μm region

R. J. Nordstrom, M. E. Thomas, J. C. Peterson, E. K. Damon, and R. K. Long

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R. J. Nordstrom, M. E. Thomas, J. C. Peterson, E. K. Damon, and R. K. Long, "Effects of oxygen addition on pressure-broadened water-vapor absorption in the 10-μm region," Appl. Opt. 17, 2724-2729 (1978)

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Abstract

We have measured the monochromatic transmittances of pressure-broadened room-temperature water vapor samples at five laser frequencies of the CO₂ laser in the 10.4-μm band. Three different buffer gases were used. They were pure nitrogen, an 80:20 mixture of nitrogen and oxygen, and a 60:40 mixture of nitrogen and oxygen. The measurements at the five laser lines imply that oxygen is a less efficient broadener than nitrogen. The ratio of the oxygen-broadening coefficient to the nitrogen-broadening coefficient was measured to be 0.75 based on the data at the R(20) laser line. Results of this study demonstrate that pure nitrogen should not be used as a broadener for atmospheric modeling of monochromatic transmittances in the laboratory.

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H₂O pressure Torr		Absorption coefficient (×10⁻⁶) in cm⁻¹
H₂O pressure Torr		Nitrogen		80:20	60:40
P(28)
	6	0.54		0.525	0.36^a
	9	1.134		1.064	0.86
	10			1.27
	12	1.86		1.633	1.52
	13			2.09
	15	2.86		2.65	2.27
	16			2.91

C₁(×10⁻⁸) Torr⁻¹ cm⁻¹		2.439		3.263	1.539

C₂ (×10⁻⁸) Torr⁻² cm⁻¹		1.105		0.931	0.911

P(20)
	6	0.403	0.435	0.517	0.33^a
	9	0.915	0.883	1.017	0.85
	10			1.185
	12	1.457	1.560	1.617	1.47
	13			1.900
	15	2.264	2.258	2.441	2.21
	16			2.760

C₁ (×10⁻⁸) Torr⁻¹ cm⁻¹		1.833		3.254	1.686

C₂ (×10⁻⁸) Torr⁻² cm⁻¹		0.883		0.870	0.872

R(20)
	6	5.464		5.92	6.06
	9	8.235		8.80	9.15
	10			9.86
	12	11.067		11.69	12.18
	13			12.74
	15	13.714		14.61	15.26
	16			15.71

C₁ (×10⁻⁸) Torr⁻¹ cm⁻¹		91.65		97.90	101.160

R(22)
	6	0.651			0.43^a
	9	1.095			1.00
	10			1.450
	12	1.784			1.63
	13			2.164
	15	2.560			2.35
	16			3.023

C₁ (× 10⁻⁸) Torr⁻¹ cm⁻¹		5.853		7.123	4.489

C₂ (× 10⁻⁸) Torr⁻² cm⁻¹		0.746		0.735	0.748

R(28)
	6	0.364		0.412	0.33
	9	0.715		0.785	0.78
	10			1.000
	12	1.239		1.284	1.32
	13			1.530
	15	1.902		1.979	1.91
	16			2.230

C₁ (× 10⁻⁸) Torr⁻¹ cm⁻¹		1.242		2.468	1.805

C₂(×10⁻⁸) Torr⁻² cm⁻¹		0.760		0.714	0.739

Laser line	A₁	A₂	C_s	B	γ = B⁻¹
P(28)	4.97 × 10⁻¹¹	181.94	2.2 × 10⁻²²	182.94	0.005
P(20)	2.79 × 10⁻¹¹	324.52	2.11 × 10⁻²²	325.52	0.003
R(22)	7.45 × 10⁻¹¹	105.05	1.84 × 10⁻²²	106.05	0.009
R(28)	2.53 × 10⁻¹¹	295.33	1.75 × 10⁻²²	296.33	0.003

H₂O pressure Torr		Absorption coefficient (×10⁻⁶) in cm⁻¹
H₂O pressure Torr		Nitrogen		80:20	60:40
P(28)
	6	0.54		0.525	0.36^a
	9	1.134		1.064	0.86
	10			1.27
	12	1.86		1.633	1.52
	13			2.09
	15	2.86		2.65	2.27
	16			2.91

C₁(×10⁻⁸) Torr⁻¹ cm⁻¹		2.439		3.263	1.539

C₂ (×10⁻⁸) Torr⁻² cm⁻¹		1.105		0.931	0.911

P(20)
	6	0.403	0.435	0.517	0.33^a
	9	0.915	0.883	1.017	0.85
	10			1.185
	12	1.457	1.560	1.617	1.47
	13			1.900
	15	2.264	2.258	2.441	2.21
	16			2.760

C₁ (×10⁻⁸) Torr⁻¹ cm⁻¹		1.833		3.254	1.686

C₂ (×10⁻⁸) Torr⁻² cm⁻¹		0.883		0.870	0.872

R(20)
	6	5.464		5.92	6.06
	9	8.235		8.80	9.15
	10			9.86
	12	11.067		11.69	12.18
	13			12.74
	15	13.714		14.61	15.26
	16			15.71

C₁ (×10⁻⁸) Torr⁻¹ cm⁻¹		91.65		97.90	101.160

R(22)
	6	0.651			0.43^a
	9	1.095			1.00
	10			1.450
	12	1.784			1.63
	13			2.164
	15	2.560			2.35
	16			3.023

C₁ (× 10⁻⁸) Torr⁻¹ cm⁻¹		5.853		7.123	4.489

C₂ (× 10⁻⁸) Torr⁻² cm⁻¹		0.746		0.735	0.748

R(28)
	6	0.364		0.412	0.33
	9	0.715		0.785	0.78
	10			1.000
	12	1.239		1.284	1.32
	13			1.530
	15	1.902		1.979	1.91
	16			2.230

C₁ (× 10⁻⁸) Torr⁻¹ cm⁻¹		1.242		2.468	1.805

C₂(×10⁻⁸) Torr⁻² cm⁻¹		0.760		0.714	0.739

Laser line	A₁	A₂	C_s	B	γ = B⁻¹
P(28)	4.97 × 10⁻¹¹	181.94	2.2 × 10⁻²²	182.94	0.005
P(20)	2.79 × 10⁻¹¹	324.52	2.11 × 10⁻²²	325.52	0.003
R(22)	7.45 × 10⁻¹¹	105.05	1.84 × 10⁻²²	106.05	0.009
R(28)	2.53 × 10⁻¹¹	295.33	1.75 × 10⁻²²	296.33	0.003

Abstract

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Applied Optics