Photoacoustic spectroscopy of C2H4 with a tunable waveguide CO2 laser

Ari Ólafsson; Mads Hammerich; Jes Henningsen

doi:10.1364/AO.31.002657

Applied Optics
Vol. 31,
Issue 15,
pp. 2657-2668
(1992)
•https://doi.org/10.1364/AO.31.002657

Photoacoustic spectroscopy of C₂H₄ with a tunable waveguide CO₂ laser

Ari Ólafsson, Mads Hammerich, and Jes Henningsen

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Ari Ólafsson, Mads Hammerich, and Jes Henningsen, "Photoacoustic spectroscopy of C₂H₄ with a tunable waveguide CO₂ laser," Appl. Opt. 31, 2657-2668 (1992)

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Abstract

A photoacoustic gas spectrometer using a wave-guide CO₂ laser, tunable over 500-MHz windows in 70 lines, is described. The spectrometer is used for mapping Doppler-limited spectral signatures of ethylene and for measuring pressure-broadening rates for collisions with N₂, Ar, and He. A total of 41 observed transitions are assigned to the v₇, v₁₀, and v₄ bands of normal ethylene and to the v₇ band of the ¹³C¹²CH₄ isotopomer.

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Equations (16)

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CO₂ Laser Line	Offset, Δv (MHz)	Lorentz Width, Δv_L (MHz)	Acoustic Strength, Ã (mV/W)a	Assignment

				Transition						Offset, Δv (MHz)	Reference
				J′	K_a′	K_c′	−J″	K_a″	K_c″	Offset, Δv (MHz)	Reference
10P46	99	40	1.70	05	02	03	−06	03	03	107	24
	−141	42	0.41	25	04	21	−25	05	21	−143	24
10P44	57	37	1.91	17	08	9/10	−16	09	7/8	50	24
	57	37	1.91	09	00	09	−10	01	09	61	24
	206	21	0.32	24	03	21	−25	02	23	220	24
10P42	193	25	0.05
	−106	38	0.03
10P40	63	32	0.06
	222	24	0.05
10P38	−117	28	0.03
	300	37	0.17	20	11	10/9	−19	10	9/10b	314	24
10P30	−105	27	0.13							−110	21
10P28	435	45	1.76	02	01	02	−02	02	00	420	30
10P26	109	55	1.64	06	01	05	−06	02	05	106.3	21
10P24	149	25	0.40	21	06	15	−20	07	13	149.4	21
	280	—	—	21	06	16	−20	07	14	308	24
10P22	32	34	0.06							33.5	21
	−231	20	0.02
10P20	187	(81)	(0.19)	04	00	04	−04	01	04c	196.6	21,29
	−248	(77)	(0.09)	29	08	22	−28	10	18d	−258	24
l0P18	80	47	0.10	20	01	19	−20	02	19c	82.0	21,29
	−207	—	—							−220	28
10P16	−78	25	0.25	25	06	19	−24	07	17	−80.1	21
10P14	268	42	1.02	28	01	27	−28	02	27	285.7	21
	−434	36	5.90	21	01	21	−21	00	21	−476	24
10P12	105	28	0.37	39	00	39	−39	01	39	108.1	21
	105	28	0.37	39	01	39	−39	00	39	100.0	21
	−236	23	0.19							−259.6	21
10P10	−98	40	1.48	05	00	05	−04	01	03	−97.5	21
10P10	−243			20	04	16	−19	05	14	−283	24
10P8	47	33	0.26	32	04	29	−32	03	29	58.4	21
10P6	−121	19	0.13							−100	28

CO₂ Laser Line	Offset, Δv (MHz)	Lorentz Width, Δv_L (MHz)	Acoustic Strength, Ã (mV/W)	Assignment

				Transition						Offset, Δv (MHz)	Ref.
				J′	K_a′	K_c′	−J″	K_a″	K_c″	Offset, Δv (MHz)	Ref.
10R4	102	26	0.60	21	07	14	−22	06	16	113	24
10R4	−45	39	0.10
10R12	−573	40	2.76	10	03	07	−10	02	09	−550	24
10R16	−230	36	0.07
	480	37	0.87	12	06	06	−13	05	08	426	24
	480	37	0.87	12	06	07	−13	05	09	465	24
10R22	112	44	2.03	04	03	01	−03	02	01	111.4	21
10R24	212	30	0.16							200	28
10R28	−212	35	5.53	06	03	04	−05	02	04	−228	24
10R34	−25									−15	28
10R38	−278	24	6.02	09	03	07	−08	02	07	−307	24
9P36	330	48	0.61	27	04	24	−26	03	24	295	24
9P34	33	19	0.54	27	03	25	−26	02	25	32	24
9P34	302	43	3.85	09	08	01/02	−08	07	01/02	299	24
9P30	109	26	0.71	22	10	12/13	−22	09	14/13	116	24
9P24	−117	41	0.06
9P24	143	55	0.06
9P18	−59	24	0.90	24	07	17	−23	06	17	−63.1	21
9P18	209	38	0.12	34	03	31	−33	02	31	205	24
9P16	−215	25	0.11	21	15	06/07	−22	14	08/09	−244	24
9R10	−21	22	0.81							−20	28
9R30	130	30	0.31	29	08	22	−28	08	20a	132	24

Broadening Rate (MHz/mbar)	Instrument Width (MHz)	Collision Partner	Method
2.53 ± .05	20 ± 3	N₂	Photoacoustics
2.41 ± .15	21 ± 6	N₂	Linear absorption
1.76 ± .04	19 ± 3	He	Photoacoustics
2.21 ± .04	23 ± 3	Ar	Photoacoustics

CO₂ Laser Line	Offset, Δv (MHz)	Lorentz Width, Δv_L (MHz)	Acoustic Strength, Ã (mV/W)a	Assignment

				Transition						Offset, Δv (MHz)	Reference
				J′	K_a′	K_c′	−J″	K_a″	K_c″	Offset, Δv (MHz)	Reference
10P46	99	40	1.70	05	02	03	−06	03	03	107	24
	−141	42	0.41	25	04	21	−25	05	21	−143	24
10P44	57	37	1.91	17	08	9/10	−16	09	7/8	50	24
	57	37	1.91	09	00	09	−10	01	09	61	24
	206	21	0.32	24	03	21	−25	02	23	220	24
10P42	193	25	0.05
	−106	38	0.03
10P40	63	32	0.06
	222	24	0.05
10P38	−117	28	0.03
	300	37	0.17	20	11	10/9	−19	10	9/10b	314	24
10P30	−105	27	0.13							−110	21
10P28	435	45	1.76	02	01	02	−02	02	00	420	30
10P26	109	55	1.64	06	01	05	−06	02	05	106.3	21
10P24	149	25	0.40	21	06	15	−20	07	13	149.4	21
	280	—	—	21	06	16	−20	07	14	308	24
10P22	32	34	0.06							33.5	21
	−231	20	0.02
10P20	187	(81)	(0.19)	04	00	04	−04	01	04c	196.6	21,29
	−248	(77)	(0.09)	29	08	22	−28	10	18d	−258	24
l0P18	80	47	0.10	20	01	19	−20	02	19c	82.0	21,29
	−207	—	—							−220	28
10P16	−78	25	0.25	25	06	19	−24	07	17	−80.1	21
10P14	268	42	1.02	28	01	27	−28	02	27	285.7	21
	−434	36	5.90	21	01	21	−21	00	21	−476	24
10P12	105	28	0.37	39	00	39	−39	01	39	108.1	21
	105	28	0.37	39	01	39	−39	00	39	100.0	21
	−236	23	0.19							−259.6	21
10P10	−98	40	1.48	05	00	05	−04	01	03	−97.5	21
10P10	−243			20	04	16	−19	05	14	−283	24
10P8	47	33	0.26	32	04	29	−32	03	29	58.4	21
10P6	−121	19	0.13							−100	28

CO₂ Laser Line	Offset, Δv (MHz)	Lorentz Width, Δv_L (MHz)	Acoustic Strength, Ã (mV/W)	Assignment

				Transition						Offset, Δv (MHz)	Ref.
				J′	K_a′	K_c′	−J″	K_a″	K_c″	Offset, Δv (MHz)	Ref.
10R4	102	26	0.60	21	07	14	−22	06	16	113	24
10R4	−45	39	0.10
10R12	−573	40	2.76	10	03	07	−10	02	09	−550	24
10R16	−230	36	0.07
	480	37	0.87	12	06	06	−13	05	08	426	24
	480	37	0.87	12	06	07	−13	05	09	465	24
10R22	112	44	2.03	04	03	01	−03	02	01	111.4	21
10R24	212	30	0.16							200	28
10R28	−212	35	5.53	06	03	04	−05	02	04	−228	24
10R34	−25									−15	28
10R38	−278	24	6.02	09	03	07	−08	02	07	−307	24
9P36	330	48	0.61	27	04	24	−26	03	24	295	24
9P34	33	19	0.54	27	03	25	−26	02	25	32	24
9P34	302	43	3.85	09	08	01/02	−08	07	01/02	299	24
9P30	109	26	0.71	22	10	12/13	−22	09	14/13	116	24
9P24	−117	41	0.06
9P24	143	55	0.06
9P18	−59	24	0.90	24	07	17	−23	06	17	−63.1	21
9P18	209	38	0.12	34	03	31	−33	02	31	205	24
9P16	−215	25	0.11	21	15	06/07	−22	14	08/09	−244	24
9R10	−21	22	0.81							−20	28
9R30	130	30	0.31	29	08	22	−28	08	20a	132	24

Abstract

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Figures (9)

Tables (3)

Equations (16)

Applied Optics