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Table 1

Transitions considered in this work.

Mol. species Frequency Resolved QNs Eu/kB
(GHz) (K)
H30α 231.901

CH3CN 220.594 JK = 126–116 326
220.641 JK = 125–115 247
220.679 JK = 124–114 183
220.709 JK = 123–113 133
220.730 JK = 122–112 97

CH3CN v8 = 1 221.299 JK,l = 124,−1–114,−1 762
221.312 JK,l = 126,1–116,1 771
221.338 JK,l = 123,−1–113,−1 698
221.350 JK,l = 125,1–115,1 706
221.367 JK,l = 122,−1–112,−1 649
221.381 JK,l = 124,1–114,1 655
221.387 JK,l = 121,−1–111,−1 615
221.394 JK,l = 120,1–110,1 594
221.404 JK,l = 123,1–113,1 619
221.422 JK,l = 122,1–112,1 596

13CH3CN 232.125 JK = 135–125 257
232.164 JK = 134–124 193
232.195 JK = 133–123 142
232.217 JK = 132–122 107
232.230 JK = 131–121 85
232.234 JK = 130–120 78

Notes. Column 1 reports the molecular species, Col. 2 the rest frequency of the transition, Col. 3 the quantum numbers, and Col. 4 the upper state energy.

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