THE FLUORESCENCE SPECTRA OF $C_{2}N_{2}$

Abstract

Author Institution: Department of Chemistry, Howard University; Department of Chemistry, Ballistic Research Laboratory; Department of Chemistry, Howard UniversityDispersed fluorescence spectra have been measured following excitation of all of the non-dissociative levels of the $A^{1}\Sigma^{-}_u$ levels of ethanedinitrile $C_{2}N_{2}$. The spectra are characterized by long progressions in the $v_{1}$ and $v_{4}$ modes. The longest wavelength fluorescence terminates on ground state vibrational levels more than $14,000 cm^{-1}$ above the origin. In addition the radiative lifetimes have an inverse dependence on the amount of excitation in the $v_{4}$ mode, which may indicate a crossing to high lying levels of the $x^{1}\Sigma^{+}_g$ electronic state