Table 2
HCN J = 2 → 1 rotational lines observed with SEPIA.
| Transition | Frequency | Eℓ∕k |
|---|---|---|
| (ν1, ν2, ν3) | (MHz) | (K) |
| (0, 11c, 0) | 177238.6556(4) | 1028.7 |
| (0,0,0) | 177261.1112(3) | 4.3 |
| (0, 11d, 0) | 178136.4778(4) | 1028.3 |
Notes. Columns are (from left toright) vibrational quantum numbers, frequency (with last-digit uncertainty in parentheses) and energy above ground of the lower state in Kelvin; k is the Boltzmann constant. Frequency values were taken from the CDMS. The highly accurate values for the ν2 = 1 state lines are based on the molecular constants determined by Thorwirth et al. (2003a).
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