Measurement of weak ir absorption with a tunable laser: the hydrogen S<sub>2</sub>(1) line strength

C. Chackerian; L. P. Giver

doi:10.1364/AO.14.001993

Applied Optics
Vol. 14,
Issue 8,
pp. 1993-1996
(1975)
•https://doi.org/10.1364/AO.14.001993

Measurement of weak ir absorption with a tunable laser: the hydrogen S₂(1) line strength

C. Chackerian and L. P. Giver

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C. Chackerian and L. P. Giver, "Measurement of weak ir absorption with a tunable laser: the hydrogen S₂(1) line strength," Appl. Opt. 14, 1993-1996 (1975)

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Abstract

A tunable laser light source has been used to obtain the intensity of the S₂(1) hydrogen quadrupole line at ∼8604.2 cm⁻¹. The result (0.0140 ± 0.0007 cm⁻¹/km-amagat) is in excellent agreement with a previous determination as well as with ab initio calculations.

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Amagat	Number of measurements	cm⁻¹	Saturation factor	cm⁻¹ /km-amagat	Weight

Density^a		Equivalent width		Line intensity
3.146	2	0.0260 ± 0.0030	1.2305	0.01120 ± 0.00130	0.044
2.811	1	0.0235 —	1.2088	0.01113 —	0.022
2.420	8	0.0238 ± 0.0011	1.2075	0.01312 ± 0.00058	0.218
2.395	4	0.0256 ± 0.0005	1.2260	0.01447 ± 0.00027	1.000
2.393	1	0.0172 —	1.1406	0.00905 —	0.022
Average line intensity (300 K) = 0.0140 ± 0.0007 cm⁻¹/km-amagat.

	cm⁻¹/km-amagat

	S₂ (1)	S₃ (1)	S₄ (1)
Fink et al.12	0.0140	0.0013
This work	0.0140 ± 0.0007
Calc. via Eq. (3)	0.01402	0.00128	0.000163
Calc. via Eq. (3) and S₂(1) intensity		0.00128 ± 0.00006	0.000163 ± 0.000008

Amagat	Number of measurements	cm⁻¹	Saturation factor	cm⁻¹ /km-amagat	Weight

Density^a		Equivalent width		Line intensity
3.146	2	0.0260 ± 0.0030	1.2305	0.01120 ± 0.00130	0.044
2.811	1	0.0235 —	1.2088	0.01113 —	0.022
2.420	8	0.0238 ± 0.0011	1.2075	0.01312 ± 0.00058	0.218
2.395	4	0.0256 ± 0.0005	1.2260	0.01447 ± 0.00027	1.000
2.393	1	0.0172 —	1.1406	0.00905 —	0.022
Average line intensity (300 K) = 0.0140 ± 0.0007 cm⁻¹/km-amagat.

	cm⁻¹/km-amagat

	S₂ (1)	S₃ (1)	S₄ (1)
Fink et al.12	0.0140	0.0013
This work	0.0140 ± 0.0007
Calc. via Eq. (3)	0.01402	0.00128	0.000163
Calc. via Eq. (3) and S₂(1) intensity		0.00128 ± 0.00006	0.000163 ± 0.000008

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Applied Optics