Abstract
The far infrared and infrared spectra of formamide (HCONH 2) have been recorded at high resolution (0.00125 cm −1) in the region of 90–1060 cm −1. Over 20,000 transitions from the out-of-plane NH 2 wagging motion ( n 12 = 1 ← 0 fundamental, n 12 = 2 ← 0 overtone, n 12 = 2 ← 1 difference bands), torsion ( n 11 = 1 ← 0 bands), and out-of-phase NCO/NH 2 bend ( n 9 = 1 ← 0 bands) have been assigned. Molecular parameters have been obtained for the ground state and the unperturbed n 12 = 1 state. The least-squares fit calculations were completed with the microwave data available in the literature. The complicated resonance system between the n 12 = 2, n 11 = 1, and n 9 = 1 states has been investigated carefully. Thus, we have been able to verify almost all resonances (avoided crossing) existing in the region J, K investigated. In the coupled Hamiltonian used for the fit, all Watson’s reduced parameters, including the octic ones and 16 Coriolis coupling parameters were taken into account. The rms deviation obtained from the fit was 0.000247 cm −1.
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