MERCURY-INDUCED VIBRATIONAL LINES IN AN ALPHA-NITROGEN MATRIX

The infrared spectroscopy of a nitrogen matrix doped with mercury was revisited with an high resolution Fourier transform spectrometer. The detection of a new line and more accurate frequencies and intensities obliges us to revise the previous line attributions (Legay, F.; Legay- Sommaire, N.; Chandrasekharan, V. J. Phys. Chem. 1990, 94, 8548). The previous model is still valid on the condition that we modify the orie ntation of the twelve nearest neighbors around a mercury atom and intr oduce three different coupling constants. The vibrational emission lin es of Nz in its ground electronic state have been measured from nu' 5 to nu' 16 and, in comparison with the gas phase data, show the variati on of the matrix effect with the vibrational excitation. The presence of additional weak emission lines at low temperature suggests that sma ll proportions of excited nitrogen molecules are in particular sites.