Table 1.
Rotational and distortion constants for C7N−.
| TMC-1 (a) | IRC +10216 (b) | All data (c) | Ab initio (d) | |
|---|---|---|---|---|
| B (MHz) | 582.68492±0.00024 | 582.68274±0.00085 | 582.68490±0.00022 | 582.75 |
| D (Hz) | 4.01±0.13 | 3.31±0.31 | 4.00±0.12 | 4.3 |
| Nlines | 6 | 17 | 17 | |
| Jmax | 32 | 43 | 43 | |
| σ (kHz) | 4.0 | 61 | 43 | |
Notes.
Parameters derived using the frequencies measured towards TMC-1 (see Table A.2).
Parameters derived using the frequencies measured towards IRC +10216 (see Table A.1).
Parameters derived using the frequencies of the lines J = 27 − 26 up to J = 32 − 31 measured in TMC-1, and J = 33 − 32 up to J = 43 − 42 measured in IRC +10216.
Computed rotational constant from ab initio calculations as described in the text (see also Botschwina & Oswald 2008).
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