INTENSITIES AND WIDTHS OF THE ROVIBRATIONAL LINES OBSERVED IN THE 2-NU(5) OVERTONE BAND OF CYANOACETYLENE

The relative intensities and Lorentz half-widths of rovibrational tran sitions observed for the 2v(5) overtone band of cyanoacetylene, HCCCN, have been determined. The line widths and the intensities were obtain ed by fitting the observed line profiles with Voigt functions. The Lor entz half-width shows a clear J dependence and vanishes at J similar t o 100. In the intensity calculation, we took into account the effects of the accidental resonances between the v(5) = 2 state and the (v(4) - 1, v(7) = 2) state as well as those of the generic l-type resonance. Peak intensities have been found not to be the appropriate presentati on of the line intensity because of the strong J dependence of the hal f-width.