Measurement research of line intensity and self-broadening coefficient for NH<sub>3</sub> spectra in 4296–4302 cm<sup>–1</sup>

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Abstract

Spectral parameters of NH ₃in a range of 4296–4302 cm ^–1in the HITRAN database are different from the actual situation as they are derived from theoretical calculations. In order to correct the spectral parameters of NH ₃in this range in HITRAN, tunable diode laser absorption spectroscopy (TDLAS) technology and metrological theory are used to measure the absorption spectrum high-purity NH ₃in the range of 4296–4302 cm ^–1at 2–10 Torr. The line intensity and self-broadening coefficient of the main absorption line of NH ₃in this band are retrieved and their uncertainty are calculated by comprehensively considering main factors including pressure, temperature, optical path of gas cell, wavenumber and line shape fitting. The discrepancies between our measured line intensities and latest peer-measured results are within 20%. The biases between our self-broadening coefficients and the ones in HITRAN2020 are within 14%. Their uncertainties are in a range of the 0.63–2.7% and 0.77–5.4%, respectively, which are smaller than the uncertainty range of 10–20% in the HITRAN database. Some of the measured spectral parameters are not recorded in HITRAN. The experimental results in this work are of significant reference in supplementing and correcting the HITRAN spectral parameters of NH ₃in the range of 4296–4302 cm ^–1.

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Authors and contacts

Corresponding author:Shao Li,shaoli-eei@163.com; Zhang Yu-Jun,yjzhang@aiofm.ac.cn;

Funds:Project supported by the Key Program of the National Natural Science Foundation of China (Grant No. 62033012) and the Key Research and Development Program of Anhui Province, China (Grant No. 201904a07020093)

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ν₀/cm^–1	S(T₀)/(10^–22cm·molecule^–1)				γ_self/(cm^–1·atm^–1)
ν₀/cm^–1	Čermák	TW	HT	R_TW/%	TW	HT	R_TW/%
4296.6529	5.736	5.846 (37)	6.421^b	0.63	0.4402(34)	0.5^b	0.77
4297.0146	25.82	23.68(15)	29.37^b	0.63	0.588(13)	0.5^b	2.2
4297.4443	7.023	6.162(39)	7.806^b	0.63	0.2967(27)	0.299^a	0.91
4297.5699	3.541	3.137(22)	3.853^b	0.70	0.3118(59)	0.299^a	1.9
4298.0294	0.6318	0.6343(86)	0.558^b	1.3	0.4465(80)	0.486^b	1.8
4298.1663	0.6375	0.6944(97)	0.00336^b	1.4	0.2741(94)	0.5^b	3.4
4298.2543	5.41	5.486(64)	5.999^b	1.2	0.3255(67)	0.328^a	2.1
4298.8221	0.6283	0.6611(60)	None	0.90	0.2634(90)	None	3.4
4298.8582	0.7484	0.6855(61)	0.725^b	0.89	0.320(11)	0.327^b	3.4
4299.7252	11.14	9.751(81)	11.16^b	0.83	0.3960(82)	0.452^a	2.1
4300.1409	7.686	6.174(57)	6.921^c	0.92	0.3958(80)	0.364^a	2.0
4300.2839	2.045	1.674(23)	1.803^b	1.3	0.220(12)	0.255^b	5.4
4300.654	0.5549	0.669(18)	None	2.7	0.485(13)	None	2.7
4300.7518	1.068	1.1089(86)	0.893^b	0.77	0.2138(85)	0.486^b	3.9
4301.131	6.906	6.415(45)	7.385^b	0.70	0.3995(54)	0.455^a	1.3
注: TW代表本文工作,R_TW代表本工作数据的相对标准不确定度, Čermák代表Čermák等^[16]测量的线强数据, HT代表HITRAN2020,T₀= 296 K;^a不确定度2%—5%,^b不确定度10%—20%,^c不确定度 > 20%; 括号中的数字表示标准不确定度(如5.846 (37)表示5.846 ± 0.037), None表示HITRAN2020没有该谱线数据.

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Quantity	Value	Relative uncertainty/%	Index of uncertainty contribution/%
Quantity	Value	Relative uncertainty/%	S(T₀)	γ_self
p	1.17 × 10^–3MPa	0.2	10.07	0.82
T	296.2 K	0.21	11.11	0.9
L	81.61 cm	0.51	65.53	5.34
A	0.055837 cm^–1	0.203
A_fit	0.055837 cm^–1	0.037	0.34
k_ν	1	0.2	10.07
k_Lf	1	0.107	2.88
S(T₀)	2.368 × 10^–21cm/molecule	0.63
$\Delta {\nu _{\text{L}}}$	0.0142 cm^–1	0.21
$\Delta {\nu _{ {\text{L,fit} } } }$	0.0142 cm^–1	0.07		0.1
k_ν	1	0.2		0.82
k_Lf	1	2.12		92.02
γ_self	0.588 cm^–1/atm	2.21

DownLoad: CSV

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Vol. 71, Issue 16 - 2022-08-20

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