HIGH-RESOLUTION INFRARED STUDY OF THE FUNDAMENTAL BANDS OF MONOIODOACETYLENE

The infrared spectrum of monoiodoacetylene has been recorded in certain selected wavenumber regions between 200 and 3500 cm-1 with a Fourier transform spectrometer at resolutions varying from 0.0025 to 0.0046 cm-1. All five fundamental bands of the HCCI molecule have been observed and analyzed. The rotational constants for the ground state, B0 = 0.105942095(51), D0 = 1.73390(86) x 10(-8), and H0 = -2.27(42) x 10(15) cm-1, have been determined by fitting 448 combination differences calculated from the P and R transitions in the fundamentals. From the analyses of the upper states the molecular constants for all the fundamental vibrational levels have been obtained. (C) 1994 Academic Press, Inc.