Knowledge Bank

The $A¯2\pi \leftarrow X¯2\Sigma +$ transition of strontium monoisocyanate was rotationally asnalysed at Doppler-limited resolution. Strontium isocyanate was produced by the gas-phase reaction of excited strontium metal vapor (3P1 sr) and hydrogen isocyanate. The isocyanate ligand was found to be nitrogen bonding to the metal by comparing the SrNCO spectrum with those at the N-bonding stranlium monoszide, $SrN3$, and the O-bonding strontium monoethoxide, $SrOCH2CH3$ SrNCO was found to be a linear, ionic molecule, $M+--NCO$, with a low frequency bending vibration $(-40cm-1)$ and dense sequence structure. Selective laser excitation with narrow-band fluorescence detection was used to extract the individual branches from the dense rotational and vibrational structure. The spectra obtained and the results of the analysis will be discussed.