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Table 2

HCN J = 2 → 1 rotational lines observed with SEPIA.

Transition Frequency Ek
(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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