Knowledge Bank

The emission spectrum of the first negative ($B2\Sigma u+-X2\Sigma g+$) bands of the nitrogen-15 ion, $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}N2+$, excited in a hollow cathode discharge tube of a special design has been investigated in the spectral region 3570 - 5170 \AA. The rotational structure of thirteen bands involving $v\prime =0,1$ and 2 and $v\prime \prime =0$ to 5 were photographed in the 2nd and 3rd orders of 2 m and 3,4 m grating spectrographs. Spin-splitting of the rotational levels has been measured for several of the observed bands. Perturbations are observed in the $v=0$ level of the B state. At the time of preparing this abstract the rotational analysis of seven bands has been completed and that of the rest of the bands is in progress. The results of the analysis of all the thirteen bands will be presented.