Abstract
The rotational spectrum of the semistable HC 5 N molecule has been investigated in the millimeter-wave region for eight excited bending states which lie below 500 cm -1 , namely v 11 = 1, 2, 3, and 4, v 10 = 1, v 9 = 1, (v 10 = 1, v 11 = 1), and (v 10 = 1, v 11 = 2). Transitions up to J = 101 ← 100 were measured, reaching a frequency as high as 270 GHz. The set of spectroscopic constants determined in the present work makes it possible to predict with much improved accuracy the transition frequencies of millimeter-wave lines produced by vibrationally excited HC 5 N in hot core molecular sources and circumstellar shells. In addition, results of extensive CCSD(T) calculations are presented, which yield accurate term values for low-lying bending vibrational states.
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