Table B.1
Observed transitions of the ν2/ν4 bending vibration of ![Mathematical equation: $\[\mathrm{CH}_{3}^{+}\]$](/articles/aa/full_html/2026/07/aa60397-26/aa60397-26-eq34.png)
(in cm−1).
| J′ | K′ | la | J″ | K″ | obs / cm−1 | |
|---|---|---|---|---|---|---|
| ν4 | 5 | 5 | −1 | 6 | 6 | 1329.6285 |
| ν2 | 2 | 2 | 3 | 2 | 1333.4349 | |
| ν4 | 4 | 4 | −1 | 5 | 5 | 1340.1263 |
| ν4 | 4 | 3 | −1 | 5 | 4 | 1349.4092 |
| ν4 | 3 | 3 | −1 | 4 | 4 | 1350.5411 |
| ν2 | 1 | 1 | 2 | 1 | 1352.6374 | |
| ν4 | 4 | 2 | −1 | 5 | 3 | 1355.6816 |
| ν4 | 3 | 2 | −1 | 4 | 3 | 1359.3436 |
| ν4 | 2 | 2 | −1 | 3 | 3 | 1360.8765 |
| ν4 | 3 | 1 | −1 | 4 | 2 | 1364.7276 |
| ν4 | 3 | 0 | ±1 | 4 | 1 | 1367.7013 |
| ν4 | 2 | 1 | −1 | 3 | 2 | 1369.0859 |
| ν4 | 1 | 1 | −1 | 2 | 2 | 1371.1270 |
| ν4 | 2 | 0 | ±1 | 3 | 1 | 1373.2306 |
| ν4 | 2 | 1 | 1 | 3 | 0 | 1374.5166 |
| ν4 | 1 | 0 | ±1 | 2 | 1 | 1378.5051 |
| ν4 | 0 | 0 | ±1 | 1 | 1 | 1381.2923 |
| ν2 | 0 | 0 | 1 | 0 | 1387.0896 | |
| ν2 | 4 | 4 | 4 | 4 | 1389.2755 | |
| ν2 | 5 | 5 | 5 | 5 | 1389.3193 | |
| ν2 | 3 | 3 | 3 | 3 | 1389.3385 | |
| ν2 | 6 | 6 | 6 | 6 | 1389.4431 | |
| ν2 | 2 | 2 | 2 | 2 | 1389.5589 | |
| ν2 | 1 | 1 | 1 | 1 | 1390.0671 | |
| ν4 | 4 | 4 | 1 | 4 | 3 | 1391.2350 |
| ν4 | 5 | 5 | 1 | 5 | 4 | 1391.2535 |
| ν4 | 3 | 3 | 1 | 3 | 2 | 1391.3024 |
| ν4 | 2 | 2 | 1 | 2 | 1 | 1391.4577 |
| ν4 | 1 | 1 | 1 | 1 | 0 | 1391.5431 |
| ν4 | 3 | 2 | 1 | 3 | 1 | 1392.1531 |
| ν4 | 4 | 3 | 1 | 4 | 2 | 1392.3216 |
| ν4 | 3 | 1 | 1 | 3 | 0 | 1392.4061 |
| ν4 | 5 | 4 | 1 | 5 | 3 | 1392.5043 |
| ν4 | 4 | 2 | 1 | 4 | 1 | 1392.9024 |
| ν2 | 2 | 0 | 1 | 0 | 1404.4211 | |
| ν2 | 2 | 1 | 1 | 1 | 1405.9090 | |
| ν2 | 3 | 1 | 2 | 1 | 1411.7342 | |
| ν2 | 3 | 2 | 2 | 2 | 1414.8703 | |
| ν2 | 4 | 0 | 3 | 0 | 1417.1291 | |
| ν2 | 4 | 1 | 3 | 1 | 1417.8512 | |
| ν2 | 4 | 2 | 3 | 2 | 1420.0970 | |
| ν2 | 4 | 3 | 3 | 3 | 1424.1598 | |
| ν2 | 5 | 2 | 4 | 2 | 1425.8584 | |
| ν4 | 2 | 2 | 1 | 1 | 1 | 1428.8886 |
| ν2 | 5 | 3 | 4 | 3 | 1428.9134 | |
| ν2 | 5 | 4 | 4 | 4 | 1433.5609 | |
| ν2 | 6 | 3 | 5 | 3 | 1434.3283 | |
| ν2 | 6 | 4 | 5 | 4 | 1437.9371 | |
| ν2 | 6 | 5 | 5 | 5 | 1442.9758 |
Notes. The line frequencies were measured with a wavemeter and calibrated following the procedure described in Appendix A. The accuracy of the lines is a few 0.001 cm−1 (wavenumber) and the precision better than 0.001 cm−1. (a)values for ℓ are given for transitions associated with the unperturbed ν4 vibrational mode. For K=0 the two l-components collapse.
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