Knowledge Bank

The spectrum has been recorded for first time in the region 575 - 940 nm along with known blue-green systems using second harmonic of pulsed Nd: YAG laser for vaporization of rotating SiN target inside the ablation chamber and computer controlled Spex TRIAX 320 m monochromator fitted with TE cooled ICCD as a detector. It consists of 50 new bands assigned to $\Delta v=0,\pm 1,\pm 2,-3,-4$ and $-5$ sequences a new band system with (0,0) band lying at 787 nm. The lower state vibrational constants are same as that of A$2\Pi$ state reported by earlier workers. The vibrational constants of upper excited state are as follows: \vspace{1em} \begin{tabular}{ccc} $ve=12752.4$ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ & $\omega e\prime =945.3$ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ & $\omega e\prime$x$_e^\prime=6.20 $ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$\ & $\omega e\prime \prime =1044.4$ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ & $\omega e\prime \prime$x$_e^{\prime\prime}=6.26 $ cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ \end{tabular}