Abstract
The high resolution Fourier transform spectrum of the ν1 and ν5 fundamental bands of CH3CN has been recorded in the region between 2370 and 3500cm−1. The rotational structure has been analyzed revealing a very dense and perturbed energy pattern. About 1700 lines have been assigned to the ν1-0 band (K≤7,J≤55) and to the ν5±1-0 band (K≤13/5,J≤50). Effective molecular parameters have been obtained. The levels responsible for the Fermi-type and x,y Coriolis-type interactions have been possibly identified. The deperturbative treatment was prevented by the lack of anharmonic potential constants values.
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