OH Molecular Constants

OH

Hydroxyl Radical X ²Π_i

Parameter	¹⁶O¹H	¹⁶O²H	¹⁸O¹H	Ref.
E_Σ [GHz]	979 826.0 ^a	979 747.4 ^a	979 826.0 ^b	78003
B_Σ [MHz]	507 471.7 ^a	270 817.0 ^a	504 122.4 ^a
B_Π [MHz]	556 140.9 ^a	296 312.0 ^a	552 470.4 ^a
A [MHz]	-4157 663.(450)	-4165 275.(2300)	-4157 071.(26)
BL_y [MHz]	376 653.(24)	200 438.(79)	374 164.5(11)
(A+2B) L_y [MHz]	-1534 291.(97)	-1892 097.(751)	-1539 412.7(46)
D_ΠB [MHz]	58.3519 ^a	16.1417 ^a	57.584 ^b
D_ΣB [MHz]	61.4491^a	17.2636^a	60.641 ^b
D_α [MHz]	202.6695(910)	27.08(20)	200.53 ^b
D_β [MHz]	80.8754(210)	22.719(18)	79.4438 ^b
D_αα [MHz]	0.016 38(110)	0.0054(31)	0.0141 ^b
D_ββ [MHz]	0.006 76(190)	0.010 83(86)	0.006 30 ^b
D [MHz]	-291.8(210)	112.(37)	-288.51 ^b
a [MHz]	86.1118(33)	13.3051(5)	86.1248(20)
b [MHz]	-116.2806(16)	-17.8648(110)	-116.281 ^b
c [MHz]	130.2212(19)	20.1375(110)	130.22 ^b
d [MHz]	56.6550(36)	8.7698(5)	56.6664(75)
d_J [MHz]	0.022 82(20)	0.002 03(17)	0.022 55 ^b
C_SR [MHz]	-0.099 65(79)	-0.008 07(22)	-0.099 29 ^b
eQq₁ [MHz]		0.284 96(110)
eQq₂ [MHz]		-0.1189(42)

^a From M. Geller, reported in [78003].
^b From isotopic scaling from the ¹⁶OH parameters.

Hyperfine and ρ-Doubling Constants of OH A ²Σ⁺_1/2

Parameter	A ²Σ ⁺_1/2 υ = 0	A ²Σ ⁺_1/2 υ = 1	Ref.
γ [MHz]	6776.9(30)	6502.3(36)	83024
γ_D [MHz]	-1.384(19)	-1.233(51)
b + c/3 [MHz]	775.1(11)	776.3(11)
c [MHz]	166.4(28)	149.2(24)

Other OH Molecular Constants

Species	Electronic State	Vibrational State	Parameter	Value	Ref.
OH	²Π_1/2	0	µ [C · m] µ [D]	5.56245(33) x 10^-30 1.667 58(10) ^a	78003
		1	µ [C · m] µ [D]	5.56(13) x 10^-30 1.667(40) ^b
		2	µ [C · m] µ [D]	5.46(15) x 10^-30 1.637(45) ^c
			r_e [10^-10 m]	0.979 98 ^d
	²Π_3/2	0	µ [C · m] µ [D]	5.54(3) x 10^-30 1.66(1) ^e	78003
	²Σ⁺	0	µ [C · m] µ [D]	6.59(28) x 10^-30 1.977(84) ^c
	²Σ⁺	1	µ [C · m] µ [D]	7.4(15) x 10^-30 2.22(44) ^c
OD	²Π_1/2	0	µ [C · m] µ [D]	5.5142(5) x 10^-30 1.65312(14) ^a
		1	µ [C · m] µ [D]	5.49(8) x 10^-30 1.646(23) ^c
		2	µ [C · m] µ [D]	5.23(20) x 10^-30 1.567(61) ^c
	²Σ⁺	0	µ [C · m] µ [D]	7.20(25) x 10^-30 2.159(76) ^c
	²Σ⁺	0	eQq₀ (D) [MHz]	0.18(10) ^f

^a Ref. [73074].
^b D.H. Phelps and F.W. Dalby, Can. J. Phys. 43, 144 (1965).

^c E.A. Scarl and F.W. Dalby, Can. J. Phys. 49, 2825 (1971).

^d Ref. [62002].

^e Ref. [65051].

^f R.C. Woods and T.A. Dixon, J. Chem. Phys. 64, 5319 (1976).

OH

Hydroxyl Radical X 2Πi

Hyperfine and ρ-Doubling Constants of OH A 2Σ+1/2

Other OH Molecular Constants

Hydroxyl Radical X ²Π_i

Hyperfine and ρ-Doubling Constants of OH A ²Σ⁺_1/2