Lille spectroscopic database for astrophysically and atmospherically relevant molecules

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Table 2

Parts of LSD entries 66801 and 66802 respectively with a pure rotational and hyperfine resolved spectrum of malononitrile.

Frequency (MHz)	Uncertainty (MHz)	Intensity ^a D²	σ_mn ^b (nm² MHz)	g_up	E_l (cm⁻¹)	J″	$K_{a}^{''}$ $\[K_a^{\prime \prime}\]$	$K_{c}^{''}$ $\[K_c^{\prime \prime}\]$	I″^c	F″^c	J′	$K_{a}^{'}$ $\[K_a^{\prime}\]$	$K_{c}^{'}$ $\[K_c^{\prime}\]$	I′	F′
LSD entry 66802, Q = 11210484.6
23498.5408	0.0065	3.77	1.849 × 10⁻⁸	45	0.0	1	1	1	2	1	0	0	0	0	0
23498.5408	0.0065	8.09	3.970 × 10⁻⁸	45	0.0	1	1	1	2	1	0	0	0	2	2
23498.6914	0.0026	21.33	1.047 × 10⁻⁷	45	0.0	1	1	1	1	1	0	0	0	1	1
23498.7473	0.0012	27.65	1.358 × 10⁻⁷	105	0.0	1	1	1	2	3	0	0	0	2	2
23498.8031	0.0008	35.56	1.746 × 10⁻⁷	75	0.0	1	1	1	1	2	0	0	0	1	1
23498.8979	0.0031	0.75	3.698 × 10⁻⁹	45	0.0	1	1	1	0	1	0	0	0	2	2
23498.8980	0.0031	1.62	7.940 × 10⁻⁹	45	0.0	1	1	1	0	1	0	0	0	0	0
23498.9147	0.0035	19.75	9.696 × 10⁻⁸	75	0.0	1	1	1	2	2	0	0	0	2	2
23498.9706	0.0050	7.11	3.491 × 10⁻⁸	15	0.0	1	1	1	1	0	0	0	0	1	1
LSD Entry 66801, Q = 415203.0
23498.7845	0.0006	13.96	6.169 × 10⁻⁷	15	0.0	1	1	1			0	0	0

Notes. ^(a)Intensity corresponds to g_J |⟨m|μ_x|n⟩|² for 66801 and to r × 9g_F |⟨m|μ_x|n⟩|² for 66802 and excludes g_s, as explained in the text. The total upper level degeneracy factor g_up was calculated including g_s. ^(b)The absorption cross sections, σ_mn, were calculated for T = 300 K. ^(c)The following coupling scheme was used: I = I₁ + I₂, F = J + I.

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