Abstract
The bands centred near 1430 and 1110 cm-1 in the infrared spectrum of acetaldehyde exhibit strongly distorted K-structures, indicating Coriolis resonance between v 5(a′) and v 12(a″) in the first, and v 8(a′) and v 13(a″) in the second case. The K-structures of these bands have been analysed. The theory, which is very generally applicable to study Coriolis resonance phenomena in C s -asymmetric tops, is formulated in terms of effective hamiltonians. Approximate solutions of the reduced problems involved are obtained by using perturbation theory. A least-squares analysis of sub-band frequencies yielded estimates for a number of molecular parameters. Among these, the vibrational frequencies are obtained as v 5 0 = 1429·91, v 12 0 = 1435·83, v 8 0 = 1114·04 and v 13 0 = 1107·30 cm-1. A computer program has been written allowing the simulation of the Q-branch of a Coriolis resonance band involving an a′- and an a″-fundamental of a C s -asymmetric top molecule. This program was used to verify hypothetical assi...
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