Spectroscopic investigation of ground state pyrrole ((C4H5N)-C-12): the N-H stretch

We have recorded the infrared absorption spectrum of pyrrole at 0.005 cm(-1) spectral resolution using a Fourier transform interferometer. The rotational analysis of the fundamental N-H stretch (1(0)(l)) at 3530.811343(82) cm(-1) was performed. A set of 13 upper state rovibrational parameters was determined, allowing the 2715 assigned rovibrational lines to be reproduced with a standard deviation of 1.3 10(-3) cm(-1). An attempt to record the fundamental band under slit-jet conditions is reported, The role of hot bands accompanying the series of the N-H stretch excitation is investigated, Effective vibrational parameters-omega(1)(0), X-11(0), Y-111, X-1,X-24-are obtained, The lower level in the hot band series is unambiguously identified as the V-24=1 level, by retrieving X-1,X-24 independently, from other spectral data, The observation of the complex band pattern accompanying the N-H series in the higher overtone range is discussed with the help of new data, recorded around the 1(0)(5) band at different temperatures using intracavity laser optoacoustic Spectroscopy. (C) 1997 Elsevier Science B.V.