Temperature dependence of the self-broadening coefficients for the fundamental band of carbon monoxide

Jeffrey N-P. Sun; Peter R. Griffiths

doi:10.1364/AO.20.001691

Applied Optics
Vol. 20,
Issue 9,
pp. 1691-1695
(1981)
•https://doi.org/10.1364/AO.20.001691

Temperature dependence of the self-broadening coefficients for the fundamental band of carbon monoxide

Jeffrey N-P. Sun and Peter R. Griffiths

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Jeffrey N-P. Sun and Peter R. Griffiths, "Temperature dependence of the self-broadening coefficients for the fundamental band of carbon monoxide," Appl. Opt. 20, 1691-1695 (1981)

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Abstract

The exponent η for the temperature dependence of the self-broadening coefficient of carbon monoxide has been measured directly using a tunable diode laser spectrometer. For lines of ¹²C¹⁶O between P(25) and P(31), the exponent has a value of 0.66 ± 0.05. For the P(13) and P(16) lines of ¹³C¹⁶O, the exponent appears to be the same. These results show that the value of η is less than the generally accepted value of 0.75 for temperatures between ambient and 180°C.

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T°C	P(25)		P(26)		P(27)		P(29)		P(31)
T°C	α	σ	α	σ	α	σ	α	σ	α	σ
20 (nominal)	48.2	0.22	45.9	0.55	46.3	0.35	46.7	0.43	53.3	0.36
40	46.6	0.27	45.2	0.51	44.7	0.43	44.9	0.25	50.9	0.45
60	44.8	0.30	43.6	0.32	42.1	0.27			49.4	0.33
80	43.2	0.26	41.5	0.33	40.6	0.36	42.4	0.35	48.0	0.73
100	41.6	0.26	40.5	1.01	39.0	0.40	40.8	0.51	46.3	0.24
120	40.3	0.22	38.7	0.59	37.6	0.36	39.3	0.47	43.8	0.44
140	38.8	0.34	36.5	0.40	36.6	0.56	38.0	0.54	43.5	0.97
160	^a		^a		35.3	0.24	37.1	0.50	42.9	0.33
180	^a		^a		34.3	0.19	36.0	0.36	42.3	0.59

Molecule	Line	η	σ
¹²C¹⁶O	P(25)	0.646	0.011
¹²C¹⁶O	P(26)	0.679	0.051
¹²C¹⁶O	P(27)	0.710	0.014
¹²C¹⁶O	P(29)	0.611	0.014
¹²C¹⁶O	P(31)	0.558	0.032
¹³C¹⁶O	P(9)	0.742	0.063
¹³C¹⁶O	P(13)	0.652	0.017
¹³C¹⁶O	P(16)	0.668	0.021

Line	A	B	C
P(25)	5.16	0.0420	−3.78 × 10⁻⁵
P(26)	−6.32	0.1064	−13.19 × 10⁻⁵
P(27)	11.87	0.0029	+1.15 × 10⁻⁵
P(29)	5.74	0.0349	−2.56 × 10⁻⁵
P(31)	15.56	−0.0123	+4.43 × 10⁻⁵

T°C	P(9)		P(13)		P(16)
T°C	α	σ	α	σ	α	σ
20 (nominal)	68.7	1.0	61.4	0.5	58.2	0.5
40	65.7	1.4	59.8	0.7	57.1	0.7
60	61.4	0.8	56.7	0.6	53.7	0.5
80	56.9	1.3	55.1	1.0	51.9	0.4
100	54.3	0.8	53.2	0.6	50.3	0.8
120	53.9	0.6	51.4	1.2	47.9	0.5
140			49.7	0.7	47.2	1.1
160	51.5	0.9	48.6	0.8	45.1	1.3
180	49.5	0.9	46.3	0.8	44.5	1.1

T°C	P(25)		P(26)		P(27)		P(29)		P(31)
T°C	α	σ	α	σ	α	σ	α	σ	α	σ
20 (nominal)	48.2	0.22	45.9	0.55	46.3	0.35	46.7	0.43	53.3	0.36
40	46.6	0.27	45.2	0.51	44.7	0.43	44.9	0.25	50.9	0.45
60	44.8	0.30	43.6	0.32	42.1	0.27			49.4	0.33
80	43.2	0.26	41.5	0.33	40.6	0.36	42.4	0.35	48.0	0.73
100	41.6	0.26	40.5	1.01	39.0	0.40	40.8	0.51	46.3	0.24
120	40.3	0.22	38.7	0.59	37.6	0.36	39.3	0.47	43.8	0.44
140	38.8	0.34	36.5	0.40	36.6	0.56	38.0	0.54	43.5	0.97
160	^a		^a		35.3	0.24	37.1	0.50	42.9	0.33
180	^a		^a		34.3	0.19	36.0	0.36	42.3	0.59

Abstract

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Applied Optics