On Interpretation of Infrared Absorption Lines

John Strong

doi:10.1364/AO.11.002657

Applied Optics
Vol. 11,
Issue 11,
pp. 2657-2663
(1972)
•https://doi.org/10.1364/AO.11.002657

On Interpretation of Infrared Absorption Lines

John Strong

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John Strong, "On Interpretation of Infrared Absorption Lines," Appl. Opt. 11, 2657-2663 (1972)

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Abstract

The interpretation procedures here for observations of ir absorption spectra recorded under conditions of low pressure and long path, assuming Lorentzian line shape, are treated with the help of a universal absorption contour. The central dip and slopes of the sides of the observed line contour are the measured quantities. An expression is given to correct for intruding wing absorption. The use of the line itself as a chopper to test validity of the Lorentzian line shape assumption is described.

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x	Exp^a	Poly^b	E − P^c	x	Exp	Poly	E − P
1.000	0.9568	1.0000	−0.0432	2.000	0.5441	0.5520	−0.0079
1.025	0.9497	0.9573	−0.0075	2.100	0.5095	0.5178	−0.0083
1.050	0.9421	0.9251	0.0170	2.200	0.4775	0.4857	−0.0082
1.075	0.9340	0.9007	0.0334	2.300	0.4478	0.4558	−0.0080
1.100	0.9255	0.8818	0.0437	2.400	0.4204	0.4280	−0.0076
1.150	0.9070	0.8548	0.0522	2.600	0.3717	0.3783	−0.0066
1.200	0.8871	0.8358	0.0513	2.800	0.3302	0.3357	−0.0058
1.250	0.8661	0.8202	0.0459	3.000	0.2947	0.2993	−0.0047
1.300	0.8442	0.8054	0.0388	3.400	0.2386	0.2412	−0.0033
1.350	0.8216	0.7904	0.0312	3.600	0.2153	0.2180	−0.0027
1.400	0.7987	0.7745	0.0242	3.800	0.1955	0.1978	−0.0023
1.450	0.7756	0.7577	0.0178	4.200	0.1613	0.1648	−0.0016
1.500	0.7525	0.7401	0.0124	4.600	0.1380	0.1392	−0.0012
1.550	0.7295	0.7217	0.0078	5.000	0.1181	0.1190	−0.0009
1.600	0.7069	0.7029	0.0040	6.000	0.0836	0.0841	−0.0005
1.650	0.6846	0.6837	0.0009	7.000	0.0621	0.0624	−0.0003
1.700	0.6628	0.6643	−0.0015	8.000	0.0479	0.0481	−0.0002
1.750	0.6415	0.6449	−0.0034	10.000	0.0309	0.0310	−0.0001
1.800	0.6208	0.6257	−0.0049	20.000	0.0078	0.0078	—
1.900	0.5812	0.5881	−0.0069	30.000	0.0035	0.0035	—

	00	01	02	03	04	05	06	07	08	09
30								12.70	12.24	11.85
40	11.475	11.10	10.74	10.42	10.10	9.775	9.47	9.16	8.91	8.65
50	8.41	8.18	7.94	7.725	7.51	7.29	7.08	6.88	6.70	6.525
60	6.35	6.18	6.02	5.85	5.70	5.54	5.38	5.24	5.11	4.98
70	4.84	4.71	4.60	4.475	4.35	4.225	4.11	4.00	3.88	3.775
80	3.66	3.55	3.45	3.33	3.225	3.11	3.00	2.90	2.75	2.71
90	2.60	2.48	2.38	2.27	2.16	2.04

	00	01	02	03	04	05	06	07	08	09
30	0.3190	0.3300	0.3420	0.3520	0.3630	0.3735	0.3850	0.3940	0.4040	0.4140
40	0.4240	0.4350	0.4440	0.4530	0.4630	0.4745	0.4850	0.4930	0.5020	0.5110
50	0.5220	0.5300	0.5400	0.5480	0.5575	0.5655	0.5740.	0.5820	0.5900	0.5970
60	0.6045	0.6120	0.6195	0.6250	0.6320	0.6375	0.6445	0.6500	0.6555	0.6610
70	0.6655	0.6690	0.6725	0.6750	0.6770	0.6780	0.6800	0.6800	0.6800	0.6790
80	0.6770	0.6750	0.6720	0.6700	0.6650	0.6610	0.6550	0.6475	0.6400	0.6325
90	0.6235	0.6150	0.6025	0.5920	0.5790	0.5635

ν	W_area	W_Ā_₀	ΔW
1430	0.453	0.450	−0.003
1448	0.570	0.598	0.028
	0.494	0.536	0.042
1465	0.364	0.365	0.001
	0.479	0.490	0.011
	0.646	0.683	0.037

Z

P_torr	π	π²	π³	π⁴	π⁵
0.5	0.55	0.10	0.03	0	0
1.0	0.15	0.03	0	0	0
2.0	0.10	0	0	0	0
4.0	0.02	0	0	0	0
8.0	0	0	0	0	0

Abstract

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Figures (7)

Tables (5)

Equations (23)

Applied Optics