Temperature and pressure dependence of NH3 and C2H4 absorption cross sections at CO2 laser wavelengths

U. Persson; B. Marthinsson; J. Johansson; S. T. Eng

doi:10.1364/AO.19.001711

Applied Optics
Vol. 19,
Issue 10,
pp. 1711-1715
(1980)
•https://doi.org/10.1364/AO.19.001711

Temperature and pressure dependence of NH₃ and C₂H₄ absorption cross sections at CO₂ laser wavelengths

U. Persson, B. Marthinsson, J. Johansson, and S. T. Eng

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U. Persson, B. Marthinsson, J. Johansson, and S. T. Eng, "Temperature and pressure dependence of NH₃ and C₂H₄ absorption cross sections at CO₂ laser wavelengths," Appl. Opt. 19, 1711-1715 (1980)

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Abstract

Absorption cross sections at CO₂ laser wavelengths have been measured for ethylene and ammonia. The dependence of the cross sections on pressure and temperature have been investigated for pressures and temperatures normally occurring in the atmosphere. The changes in cross section are, e.g., 5% for ethylene at the P(14) 00°1–10°0 line and 10% for ammonia at the R(8) 00°1–10°0 line for a temperature change of 30 K. A comparison with theoretical calculations is made for ammonia.

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Spectral line	Wavelength (μm)	Ethylene				Ammonia

		Cross section		K_T	K_p	Cross section		K_T	K_p

		Mean (10⁻²⁰ cm²)	Std. dev. (%)			Mean (10⁻²⁰ cm²)	Std. dev. (%)
P(14)	9.504	0.62	3.0	2.29	0.31	1.72	3.0	−1.07	0.86
P(16)	9.520	0.91	1.5	1.76	0.27	0.82	2.7	−1.32	1.08
P(18)	9.536	3.17	0.9	2.00	−0.61	1.15	1.1	−1.36	0.79
P(20)	9.552	1.71	1.8	0.80	0.44	12.1	1.8	−1.50	0.96
P(22)	9.569	3.30	0.9	1.58	−0.30	1.66	3.1	−1.49	1.00
P(24)	9.586	1.61	0.7	0.44	0.29	1.74	3.4	2.81	−0.56
P(26)	9.604	0.98	3.6	0.71	0.28	0.53	0.5	−0.09	0.49

Spectral line	Wavelength (μm)	Ethylene				Ammonia

		Cross section		K_T	K_p	Cross section		K_T	K_p

		Mean (10⁻²⁰cm²)	Std. dev. (%)			Mean (10⁻²⁰ cm²)	Std. dev. (%)
R(28)	10.195	10.4	1.2	−0.81	−0.69
R(26)	10.207	9.29	1.6	−1.35	−0.01
R(24)	10.220	20.9	0.8	−0.83	−0.06
R(22)	10.233	12.8	1.0	−1.29	−0.58
R(20)	10.247	5.37	1.5	−1.32	0.14
R(18)	10.260	2.97	2.9	−0.35	0.51
R(16)	10.274	4.60	3.1	−0.68	0.30
R(14)	10.289	7.19	1.0	0.25	−0.38	30.2	1.2	−0.62	−0.59
R(12)	10.303	8.23	1.8	−0.96	−0.04
R(10)	10.318	6.21	1.8	−1.70	0.24
R(8)	10.334					92.6	0.6	−1.07	−0.30

Spectral line	Wavelength (μm)	Ethylene				Ammonia

		Cross section		K_T	K_p	Cross section		K_T	K_p

		Mean (10⁻²⁰ cm²)	Std. dev. (%)			Mean (10⁻²⁰ cm²)	Std. dev. (%)
P(10)	10.494	14.4	0.7	−0.58	−0.10	1.00	1.3	−0.56	0.90
P(12)	10.513	19.7	0.8	−0.01	0.30	2.94	0.8	0.99	0.38
P(14)	10.532	145.1	0.9	−0.54	0.03	3.64	1.2	1.81	0.18
P(16)	10.551	23.9	0.4	−0.46	−0.02	2.32	0.6	−1.58	0.76
P(18)	10.571	15.2	0.4	−1.00	0.15	0.82	0.4	1.50	0.74
P(20)	10.591	8.82	0.7	−0.18	0.05	0.75	0.8	2.25	0.09
P(22)	10.611	6.64	0.8	0.14	0.25	0.48	1.8	0.32	0.79
P(24)	10.632	10.8	0.6	−0.54	0.15	0.73	0.4	1.11	0.55
P(26)	10.653	8.76	2.5	0.08	−0.33	1.73	1.1	2.39	0.23
P(28)	10.675	5.81	1.4	−0.78	−0.01	1.53	2.5	0.62	0.77
P(30)	10.696	6.76	1.8	−1.07	−0.28	3.94	0.7	−0.25	0.68

Spectral line	Band	Cross section 10⁻²⁰ cm²		K_T		K_p

		Exp.	Theor.	Exp.	Theor.	Exp.	Theor.
P(14)	00°1–02°0	1.72	1.36	−1.02	−0.71	0.86	0.98
P(16)	00°1–02°0	0.82	0.61	−1.23	−0.92	1.08	0.99
P(18)	00°1–02°0	1.15	0.88	−1.36	−1.14	0.77	0.99
P(20)	00°1–02°0	12.1	11.4	−1.50	−1.34	0.96	0.92
P(22)	00°1–02°0	1.66	1.32	−1.50	−1.35	1.00	0.99
R(14)	00°1–10°0	30.2	30.0	−0.62	−1.05	−0.59	−0.53
R(8)	00°1–10°0	92.6	99.4	–1.07	−0.95	−0.30	−0.36

Spectral line	Wavelength (μm)	Ethylene				Ammonia

		Cross section		K_T	K_p	Cross section		K_T	K_p

		Mean (10⁻²⁰ cm²)	Std. dev. (%)			Mean (10⁻²⁰ cm²)	Std. dev. (%)
P(14)	9.504	0.62	3.0	2.29	0.31	1.72	3.0	−1.07	0.86
P(16)	9.520	0.91	1.5	1.76	0.27	0.82	2.7	−1.32	1.08
P(18)	9.536	3.17	0.9	2.00	−0.61	1.15	1.1	−1.36	0.79
P(20)	9.552	1.71	1.8	0.80	0.44	12.1	1.8	−1.50	0.96
P(22)	9.569	3.30	0.9	1.58	−0.30	1.66	3.1	−1.49	1.00
P(24)	9.586	1.61	0.7	0.44	0.29	1.74	3.4	2.81	−0.56
P(26)	9.604	0.98	3.6	0.71	0.28	0.53	0.5	−0.09	0.49

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Applied Optics