Table 2 J(J + 1) power-series expansion coefficients (in cm−1) of upper-state term values in 27 substates of the C−N stretching band of CH3NH2.

From: Lamb-dip spectroscopy of the C−N stretching band of methylamine by using frequency-tunable microwave sidebands of CO2 laser lines

Substate (υt St−i K)

a 0

a 1

a2 × 106

a3 × 1010

(0 Aa 0) *

1044.912526(461)

0.732866(11)

−10.72(8)

44.1(16)

(0 Aa 1+)

1047.66065(167)

0.725175(4)

−3.92(26)

27.3(4)

(0 Aa 1)

1047.662408(196)

0.738380(3)

−3.34(1)

−5.0(1)

(0 Aa 2+)

1056.257642(711)

0.731710(12)

5.73(6)

−29.0(9)

(0 Aa 2)

1056.254285(389)

0.731812(7)

−2.63(3)

1.1(4)

(0 Aa 3+)

1069.565927(15)

0.731614(0)

−0.31(1)

−5.5(0)

(0 Aa 3)

1069.566059(76)

0.731610(1)

−0.28(1)

5.9(1)

(0 Aa 4)

1087.76225(210)

0.730430(40)

−1.69(20)

−0.2(3)

(0 Aa 5)

1112.580226(61)

0.731490(1)

−0.84(0)

−0.2(0)

(0 Aa 6)

1142.383547(391)

0.731342(7)

−1.01(3)

0.4(2)

(0 Aa 7)

1176.989660(29)

0.7314660(0)

−1.02(0)

0

(0 Aa 8)

1218.14342(465)

0.730775(22)

  

(0 Aa 11)

1372.109149(0)

0.730418(0)

  

(0 Ea 0)*

1045.101654(472)

0.731802(12)

−10.24(6)

34.2(9)

(0 Ea 1)

1047.93850(858)

0.737074(237)

2.77(18)

−107(37)

(0 Ea 2)

1055.93689(927)

0.730844(209)

7.42(11)

−34(17)

(0 Ea 3)

1069.121205(380)

0.731947(11)

78(7)

1.4(0)

(0 Ea 4)

1088.374933(240)

0.731462(4)

-0.49(2)

−9(2)

(0 Ea 5)

1112.77336(123)

0.731406(29)

−0.8(1)

0

(0 Ea 6)

1142.535800(365)

0.731324(6)

  

(0 Ea 7)

1177.49078(396)

0.730786(131)

  

(0 Ea 9)

1264.227504(0)

0.730818(0)

  

(0 Ea −1)

1047.6819(828)

0.727080(889)

−7(2)

0

(0 Ea -2)

1055.62915(546)

0.732554(97)

−4.2(4)

10(5)

(0 Ea −3)

1069.575107(628)

0.731907(12)

−0.49(6)

8.0(1)

(0 Ea −5)

1112.674698(42)

0.731554(1)

−0.75(0)

0

(0 Ea −6)

1142.275112(0)

0.731058(0)

  

(0 Ea −7)

1177.492590(0)

0.731449(0)

  

(0 Ea −8)

1218.416547(0)

0.730994(0)

  
  1. *First reported in Ref. 28 and confirmed in this work.
  2. Energy of the level (υt St−i K, J) = (0 As 0, 0) in the ground state is taken as the zero. Errors in parentheses are one standard deviation in units of the last quoted digit.