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Table 1

Determined parameters for the ground state and first lowest excited modes of CH2OH13CHO.

Parameter g.s. ν1 = 1 ν2 = 1 ν3 = 1

A/MHz 18 259.420856(138) 18 276.114890(202) 18 389.804481(207) 18 339.529892(210)
B/MHz 6472.436365(46) 6429.762469(73) 6424.945607(103) 6392.817976(96)
C/MHz 4924.607952(39) 4920.695284(68) 4894.384811(77) 4889.456137(79)
ΔJ /kHz 6.0549035(175) 6.109038(42) 6.025532(66) 6.195241(59)
ΔJK/kHz –20.074050(144) –19.706090(265) –21.22054( 32) –22.859886(298)
ΔK /kHz 47.14390(34) 47.73743(55) 51.24159(52) 52.62572(56)
δJ /kHz 1.7923852(60) 1.7928296(138) 1.8035355(281) 1.8204557(221)
δK /kHz 8.594098(171) 7.414565(295) 10.48764(49) 8.68613(42)
ΦJ /Hz –0.00672850(261) –0.006.6487(82) –0.0085328(189) –0.0028636(150)
ΦJK /Hz 0.165951(41) 0.093486(187) 0.22492(32) 0.176211(259)
ΦKJ /Hz –0.792121(172) –0.58880(63) –1.09705(102) –0.80421(89)
ΦK/Hz 1.06114(42) 0.95730(69) 1.37584(90) 1.16269(86)
φJ/Hz –0.00209800(116) –0.0018600(35) –0.0033456(93) –0.0003544(68)
φJK/Hz –0.020704(70) 0.007253(110) –0.070693(256) –0.011349(209)
φK/Hz 0.26838(50) –0.39595(192) 0.8892(32) 0.28761(286)
LJK/mHz –0.0046785(260) (a) (a) (a)
LKKJ/mHz 0.022324(74) (a) (a) (a)
LK /mHz –0.028327(177) (a) (a) (a)
lJK /mHz –0.0005629(72) (a) (a) (a)
lKJ /mHz 0.001660(101) (a) (a) (a)
93, 37 62, 25 63, 25 64, 25
FreqMAX /GHz 945 630 630 630
Nb lines 4218 1982 1629 1571
Fit rms /kHz 31 27 25 26

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

(a)

Fixed to the corresponding value of the ground state.

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