Laser induced fluorescence spectroscopy of AlNC/AlCN in supersonic free expansions

We have generated AlNC/AlCN in supersonic free expansions and measured the laser induced fluorescence (LIF) spectra. Prior to the experiments, ab initio calculations were carried out to obtain information necessary for the LIF spectroscopic searching. The dispersed fluorescence spectra from the single vibronic level show two kinds of vibronic bands; isolated sharp bands and congested bands. It is concluded that the sharp features are attributed to the progressions localized in the vibrational normal coordinates of AlNC, while the congested structures are ascribed to vibronic transitions terminating in the vibrational levels on the isomerization coordinate of AlNC ↔ AlCN.