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Table 2

Determined parameters for the ground state and first lowest excited modes of 13CH2OHCHO.

Parameter g.s. ν1 = 1 ν2 = 1 ν3 = 1

A/MHz 18 142.347585(137) 18 158.665788(189) 18 271.186559(194) 18 220.212215(189)
B/MHz 6486.371688(42) 6443.512178(68) 6439.195622(82) 6407.190316(87)
C/MHz 4924.025217(38) 4920.138890(64) 4893.909288(70) 4889.259376(73)
ΔJ/kHz 6.0421246(160) 6.097184(40) 6.013999(53) 6.184484(49)
ΔJK/kHz –19.380210(145) –18.993301(247) –20.566390(242) –22.150861(233)
ΔK/kHz 46.29710(35) 46.87797(51) 50.43534( 50) 51.70740(52)
δJ/kHz 1.7971024(49) 1.7981212(141) 1.8087097(176) 1.8270081(195)
δK /kHz 8.739649(166) 7.562799(303) 10.64113(35) 8.83449(43)
ΦJ/Hz –0.00680317(217) –0.0067594(82) –0.0087018(117) –0.002.8859(105)
ΦJK/Hz 0.164691(42) 0.090129(219) 0.225627(234) 0.17676(33)
ΦKJ/Hz –0.776215(181) –0.56439(72) –1.08403(82) –0.79714(115)
ΦK/Hz 1.03579(46) 0.92577(70) 1.35118(78) 1.13950(97)
φJ/Hz –0.00216263(90) –0.0019296(35) –0.0034482(50) –0.0003940(50)
φJK/Hz –0.021306(70) 0.006333(134) –0.071921(150) –0.009.972(156)
φK/Hz 0.27266(44) –0.39518(217) 0.89508(262) 0.3040(37)
LJK/mHz –0.004671(34) (a) (a) (a)
LKKJ/mHz 0.022005(72) (a) (a) (a)
LK/mHz –0.027932(191) (a) (a) (a)
lJK/mHz –0.0005147(75) (a) (a) (a)
lKJ/mHz 0.002144(85) (a) (a) (a)
93, 37 62, 25 63, 25 64, 25
FreqMAX/GHz 945 630 630 630
Nb lines 4655 2204 1884 1779
Fit rms/kHz 29 22 23 23

Notes. The uncertainties (one standard deviation) are reported between parentheses.

(a)

Fixed to the corresponding value of the ground state.

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