Abstract
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) × 10−8, and H0 = −2.27(42) × 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.
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