NIST Hydrocarbon CH tables

CH X ²Π - Methylidyne Radical

Molecular constants for ¹²CH and ¹³CH
Parameter	¹²CH [MHz]	Ref.	¹³CH [MHz]	Ref.
A₀	843 817.57(69)	84033	843 806.97 ^a	86018
B₀	425 476.852(73)		422 957.033 ^a
D₀	43.8255(32)		43.303 ^a
H₀	0.0035		0.003 44 ^a
γ₀	-771.11(26)		-766.5 ^a
γ_D₀	0.158(24)		0.156 ^a
p	1003.9957(23)		998.44(25)
p_D	-0.273 35(28)		-0.298(25)
p_H	-0.326(49) x 10^-4		0.30 x 10^-4 ^a
q	1159.6830(12)		1146.308(70)
q_D	-0.457 479(47)		-0.4777(65)
q_H	0.9632(51) x 10^-4		0.9404 x 10^-4 ^a
a(H)	54.28(14)		54.28 ^a
b_F(H)	-57.67(20)		-57.67 ^a
c(H)	57.17(17)		57.17 ^a
d(H)	43.5167(40)		43.52 ^a
d_D	-0.016 01(52)
C₁′	0.0056(17)		0.504(101)	86018
a(¹³C)			221.2(15)
b_F(¹³C)			46.8(20)
c(¹³C)			-127.8(23)
d(^l3C)			276.1(5)

^a Calculated from ¹²CH parameters.

CH X 2Π - Methylidyne Radical