Air broadened linewidths, intensities, and spectral line shapes for CO<sub>2</sub> at 4.3 μm in the region of the AMTS instrument

C. Cousin; R. Le Doucen; J. P. Houdeau; C. Boulet; A. Henry

doi:10.1364/AO.25.002434

Applied Optics
Vol. 25,
Issue 14,
pp. 2434-2439
(1986)
•https://doi.org/10.1364/AO.25.002434

Air broadened linewidths, intensities, and spectral line shapes for CO₂ at 4.3 μm in the region of the AMTS instrument

C. Cousin, R. Le Doucen, J. P. Houdeau, C. Boulet, and A. Henry

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C. Cousin, R. Le Doucen, J. P. Houdeau, C. Boulet, and A. Henry, "Air broadened linewidths, intensities, and spectral line shapes for CO₂ at 4.3 μm in the region of the AMTS instrument," Appl. Opt. 25, 2434-2439 (1986)

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Abstract

The absolute intensities and air-broadening coefficients, together with their temperature dependence have been determined for a series of very high-J R lines in the ν₃ band of CO₂ located in the spectral region of some Advanced Moisture and Temperature Sounder (AMTS) channels. These channels are located in the transmission microwindows limited by these lines. The temperature dependence of the absorption coefficient in these microwindows has been measured for N₂ and O₂ broadening. It has been clearly demonstrated that a correcting shape factor χ(σ) independent of T cannot provide a good agreement between observed and calculated absorption in the range 193 K ⩽ T ⩽ 300 K for the spectral region of the AMTS channels.

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J_i	Observed S	Calculated S
52	2.50	2.49
54	—	1.72
56	1.17	1.17
58	0.769	0.781
60	0.510	0.514
62	—	0.333
64	0.211	0.212
66	0.132	0.133
68	—	8.20 × 10⁻²
70	4.96 × 10⁻²	4.98 × 10⁻²
72	—	2.98 × 10⁻²
74	1.72 × 10⁻²	1.75 × 10⁻²
76	1.00 × 10⁻²	1.01 × 10⁻²
78	5.84 × 10⁻³	5.77 × 10⁻³
80	3.26 × 10⁻³	3.24 × 10⁻³
82	1.78 × 10⁻³	1.79 × 10⁻³
84	9.70 × 10⁻⁴	9.73 × 10⁻⁴
86	—	5.21 × 10⁻⁴
88	2.75 × 10⁻⁴	2.74 × 10⁻⁴

\|m\|		65	67	69	71	73	75	77	79	81	83
	(a)	65.5	64.7	65	64.5			60.5	60	60	58
γCO₂ (T = 296 K)	(b)	64.3			62.4		61.3	59.4	58.6	58.5	58
	(c)	65	64.5	64	63.5	62.5	61.5	60.5	59.5	59	58

	\|m\|		67	69	71	73	75	77	79	81	83
CO₂–N₂	γ(T = 296 K)	(a)	60	61.5	61.5	61.8	60.6	60.2	60.5	60.2	58.5
		(c)	61	61	60.5	60.5	60	60	60	59.5	59
	ν		0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
CO₂–O₂	γ(T = 296 K)	(a)	55	53.4	53.2	54.8	54	54.7	56.3	56.7	55.6
		(c)	55	55	55	55	55	55	55	55	55
	ν		0.82	0.82	0.82	0.82	0.82	0.82	0.82	0.82	0.82

		296		238	218	193

	σ cm⁻¹TK	Paris	Rennes	Rennes
R(20)–R(22)	2364.74	13.86
	2366.06	12.24
	2367.26	12.07
	2368.51	10.84
	2369.73	10.24
R(30)–R(32)	2370.86	8.33
	2372.02	7.18
	2373.14	6.22
	2374.24	5.24
	2375.30	4.27	4.27			1.54
R(40)–R(42)	2376.35	347 × 10⁻²	347 × 10⁻²	200 × 10⁻²	164 × 10⁻²	110 × 10⁻²
	2377.37		275	153.5	121.5	78
	2378.37		210	115.5	88.5	54
	2379.34		165	85	63	37
	2380.28		125.5	60	44	22
R(50)–R(52)	2381.20		93.5	43	29	15.5
	2382.10		690 × 10⁻³	300 × 10⁻³	195 × 10⁻³	95 × 10⁻³
	2382.97		502.5	202.5	133	62.5
	2383.81		360	132	88	42
	2384.63		260	88.5	59.5	31
R(60)–R(62)	2385.42		181	61	41	23.5
	2386.19		125	41	28.5	19.5
	2386.93		880 × 10⁻⁴	288 × 10⁻⁴	215 × 10⁻⁴	162 × 10⁻⁴
	2387.65		625	217	171	139
	2388.34		435	171	140	120
R(70)–R(72)	2389.01		305	135	118	105
	2389.65		226	113	103.50	93.5
	2390.26		165	99	90.5	82.5
	2390.85		129	86.5	79	73
	2391.42		102	76.5	70.5	65.5
R(80)–R(82)	2391.96		85	69.5	64	59

	σ cm⁻¹T_K	296	238	218	193
R(40)–R(42)	2375.30	403 × 10⁻²	255 × 10⁻²	209 × 10⁻²	134 × 10⁻²
	2376.35	313	185	148	97
	2377.37	242	136	110	70
	2378.37	188	100	75.5	50
	2379.34	144	74	54	34
	2380.28	110	53	37.5	23
R(50)–R(52)	2381.20	82	36.5	25.5	15
	2382.10	60	25.5	17.5	10
	2382,97	432 × 10⁻³	174 × 10⁻³	116 × 10⁻³	64 × 10⁻³
	2383.81	315	120	77.5	42.5
	2384.63	222	80	53	29
R(60)–R(62)	2385.42	156	55	37.5	21.5
	2386.19	107	38	26.5	17
	2386.93	73	26.5	19.5	14
	2387.65	490 × 10⁻⁴	185 × 10⁻⁴	151 × 10⁻⁴	119 × 10⁻⁴
	2388.34	322	145	120	101.5
R(70)–R(72)	2389.01	232	119	101	87.5
	2389.65	173	103	88	77.5
	2390.26	134	90	78	70
	2390.85	108	79	70.5	63.5
	2391.42	88.5	69	62.5	58
R(80)–R(82)	2391.96	77	62	56.5	54

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Applied Optics