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Table 2.
Spectroscopic constants of methoxyacetaldehyde in the ground state and five excited vibrational states (S -reduction, Ir-representation).
| Ground state | υ27 = 1 | υ26 = 1 | υ27 = 2 | υ26 = 2 | (υ27 = 1, υ26 = 1) | |
|---|---|---|---|---|---|---|
| A/MHz | 28475.786 (15)a | 27806.80 (21) | 28064.54 (33) | 27206.66 (34) | 27698.63 (71) | 27544.08 (57) |
| B/MHz | 2296.36668 (21) | 2300.90553 (42) | 2295.53193 (58) | 2305.69435 (82) | 2295.6949 (12) | 2300.3407 (10) |
| C/MHz | 2187.60489 (18) | 2197.13106 (33) | 2191.36157 (39) | 2206.53015 (53) | 2195.27353 (98) | 2200.36006 (78) |
| DJ/kHz | 0.231203 (20) | 0.249114 (26) | 0.232968 (40) | 0.268762 (60) | 0.23474 (11) | 0.252229 (50) |
| DJK/kHz | −1.6418 (17) | −3.0263 (91) | −0.879 (22) | −3.969 (35) | 0.704 (81) | −4.750 (82) |
| DK/kHz | 150 (15) | 150b | 150b | 150b | 150b | 150b |
| d1/kHz | −0.012223 (15) | −0.009300 (23) | −0.010478 (28) | −0.006545 (48) | −0.00803 (10) | −0.006312 (60) |
| d2/kHz | 0.000757 (14) | 0.000129 (14) | 0.001305 (20) | −0.000497 (24) | 0.000940(60) | −0.000329 (62) |
| HJK/Hz | −0.00522 (22) | −0.01472 (97) | 0.0755 (32) | −0.0200 (40) | . . . | . . . |
| HKJ/Hz | −0.4722 (75) | −1.99 (12) | 2.49(52) | −7.61 (68) | . . . | . . . |
| σfitc/kHz | 44 | 62 | 76 | 63 | 100 | 83 |
| Jmin/Jmax | 1/70 | 2/69 | 2/70 | 3/69 | 2/68 | 2/69 |
| Ka,min/Ka,max | 0/14 | 0/8 | 0/7 | 0/6 | 0/3 | 0/3 |
| Nd | 462 | 234 | 144 | 138 | 75 | 69 |
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