Knowledge Bank

Eighty spin-rovibronic transitions in $NH2A¯2A1(0,10,0)Ka=1\leftarrow X¯2B1(0,0,0)Ka=0,2$ and $A¯2A1(0,12,0)Ka=0\leftarrow X¯2B1(0,2,0)Ka=1$ have been observed in the range of $28810-29220cm-1$. The spectral resolution $(\Delta \nu \sim 0.03cm-1)$ of the present investigation has resolved many electron-spin doublets. The observed high-lying $\Pi (0,10,0)$ and $\Sigma (0,12,0)$ vibrational states of $NH2A¯2A1$ were only subjected to minor perturbations, despite the molecule undergoing a large-amplitude bending vibration. The molecular constants, $T=29036.13(7)cm-1,B=9.671(6)cm-1,A=0.93(25)cm-1andq=2.25(1)cm-1,ofNH2A¯\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}A1\Pi (0,10,0)$ have been obtained from a least-squares fit to the spectroscopically determined spin-rovibronic term values. The spectroscopic constants of $NH2A¯\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}A1\Sigma (0,12,0),T=32115.9(14)cm-1$ and $B=10.33(18)cm-1$, have also been determined from the present data. From the distinct power broadenings, the vibronic transition dipole moment of $A¯\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}A1(0,12,0)Ka=0\leftarrow X¯\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}B1(0,2,0)ka=1$ has been concluded to be much larger than that of $A¯\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}A1(0,10,0)Ka=1\leftarrow X¯\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}B1(0,0,0)Ka=0,2$