CH4   -   Methane

Molecular constants for CH4 and 13CH4

Parameter CH4 Ref. 13CH4 Ref.
DT [MHz] 0.132 943 57(97) 85020 0.132 980 81(122) 86011
H4T [Hz] -16.9790(90) -16.9791(112)
H6T [Hz] 10.9956(38) 11.1786(45)
L4T [Hz] 2.000(23) x 10-3 1.975(27) x 10-3
L6T [Hz] -2.519(15) x 10-3 -2.643(18) x 10-3
L8T [Hz] -2.617(92) x 10-3 -2.957(101) x 10-3
Distortion Dipole Moment Ref.
θzxy ν1=0 [C · m]
     θzxy ν1=0 [D]
0.803(45)  x 10-34 
     24.06(45) x 10-6
7104878033 
θzxy ν1=1 [C · m]
     θzxy ν1=1 [D]
0.460(67) x 10-34 
     13.8(20) x 10-6
Nuclear Hyperfine Constants Ref.
ca [kHz] 10.372(83) 80040
cd [kHz] 18.370(23)
d [kHz] 21.17(32)
Δ2 [kHz] 7970.30(66)

 

 

Molecular constants for CH3D and CH2D2

Species Parameter Value Ref.
CH3 B0 [MHz] 116 325.308(9) 80039
µ0 J,K=1,1 [C · m]
     µ0 J,K=1,1 [D]
1.882(1) x 10-32 
     5.641(3) x 10-3
70068
µ0 J,K=1,2 [C · m]
     µ0 J,K=1,2 [D]
1.894(1) x 10-32 
     5.679(3) x 10-3
eQq [kHz] 191.48(77)
cα [kHz] 16.54(35)
cβ [kHz] -1.58(100)
CH2D2 A-C [MHz] 37 555.758 75057
B-C [MHz] 13 664.280
µb [C · m]
     µb [D]
4.7(17) x 10-32 
     0.014(5)

 

 

Molecular constants for CD4 and 13CD4

Parameter CD4 Ref. 13CD4 Ref.
DT [MHz] 0.032 650 87(89) 85020 0.032 6600(12) 87003
H4T [Hz] -2.0281(40) -2.0302(61)
H6T [Hz] 1.1480(14) 1.1692(29)
L4T [Hz] 0.1194(46) x 10-3 0.1201(77) x 10-3
L6T [Hz] -0.1431(28) x 10-3 -0.1353(63) x 10-3
L8T [Hz] -0.1560(85) x 10-3 -0.1466(46) x 10-3
Distortion Dipole Moment   Ref.
θzxy [C · m]
     θzxy [D]
  0.40(3) x 10-26 
     12.0(10) x 10-6
83054


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