High-Resolution Tuned-Laser Spectroscope

H. J. Gerritsen; M. E. Heller

doi:10.1364/AO.4.S1.000073

Applied Optics
Vol. 4,
Issue S1,
pp. 73-77
(1965)
•https://doi.org/10.1364/AO.4.S1.000073

High-Resolution Tuned-Laser Spectroscope

H. J. Gerritsen and M. E. Heller

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H. J. Gerritsen and M. E. Heller, "High-Resolution Tuned-Laser Spectroscope," Appl. Opt. 4, 73-77 (1965)

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Abstract

A new technique, tuned-laser spectroscopy, is described. Absorption data are given for methane and ethane in the region from 2947.8 cm⁻¹ to 2948.0 cm⁻¹ which were obtained using a helium–neon laser. The large resolving powers available have made it possible to carry out the first absolute measurements of the collision diameters for methane–other gas collisions.

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Transition		Strength	g value in βH/h units	Fractional g value
−1	0	1/10	g₂ = 1.295	0.1295
0	1	3/10	g₁ = 1.184	0.3552
1	2	3/5	2g₁ − g₂ = 1.073	0.6438

			Total average g value =	1.1285 = ḡ

Gas	Absorption maximum at 50 torr pressure	δν_L (Mc/sec-lorr⁻¹)	δν_L (BSW) (Mc/sec-lorr⁻¹)	δν_L(BE)(Mc/sec-lorr⁻¹)	σ_G_−CH4 (Å)	r_G (Å ref.13)	r_CH4 (Å)
N₂	60 G (±5)	4.8 (±0.3)	4.8	4.8	4.28	1.88	2.4
CH₄	63 G (±5)	7.4 (±0.5)	6.2		5.0	2.08	2.5
He	61 (±5)	3.6 (±0.3)	2.5	3.00	2.78	1.09	1.7
Ne	64 (±5)	3.10 (±0.1)		3.00	3.33	1.30	2.0
A	58 (±5)	4.45 (±0.1)	3.95	4.20	4.24	1.83	2.4
CO₂			6.0	5.39		2.31
SF₆	50 (±5)	7.35 (±0.3)		6.80	5.78
HCl	50 (±5)	6.67 (±0.3)		6.70	5. 18	2.25	2.9

Transition		Strength	g value in βH/h units	Fractional g value
−1	0	1/10	g₂ = 1.295	0.1295
0	1	3/10	g₁ = 1.184	0.3552
1	2	3/5	2g₁ − g₂ = 1.073	0.6438

			Total average g value =	1.1285 = ḡ

Gas	Absorption maximum at 50 torr pressure	δν_L (Mc/sec-lorr⁻¹)	δν_L (BSW) (Mc/sec-lorr⁻¹)	δν_L(BE)(Mc/sec-lorr⁻¹)	σ_G_−CH4 (Å)	r_G (Å ref.13)	r_CH4 (Å)
N₂	60 G (±5)	4.8 (±0.3)	4.8	4.8	4.28	1.88	2.4
CH₄	63 G (±5)	7.4 (±0.5)	6.2		5.0	2.08	2.5
He	61 (±5)	3.6 (±0.3)	2.5	3.00	2.78	1.09	1.7
Ne	64 (±5)	3.10 (±0.1)		3.00	3.33	1.30	2.0
A	58 (±5)	4.45 (±0.1)	3.95	4.20	4.24	1.83	2.4
CO₂			6.0	5.39		2.31
SF₆	50 (±5)	7.35 (±0.3)		6.80	5.78
HCl	50 (±5)	6.67 (±0.3)		6.70	5. 18	2.25	2.9

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Applied Optics