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. T he rotational analysis of the fundamental N-H stretch (1(0)(l)) at 353 0.811343(82) cm(-1) was performed. A set of 13 upper state rovibration al 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-o mega(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, b y retrieving X-1,X-24 independently, from other spectral data, The obs ervation of the complex band pattern accompanying the N-H series in th e higher overtone range is discussed with the help of new data, record ed around the 1(0)(5) band at different temperatures using intracavity laser optoacoustic Spectroscopy. (C) 1997 Elsevier Science B.V.