Knowledge Bank

High resolution emission spectra of the A$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$$\Pi$--X$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$$\Sigma$$\mathrm{<mrow\; data-mjx-texclass="ORD">+</mrow>}$ transition of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C$\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}$N have been measured in the 15000--24000 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ region. Molecules were produced by the reaction of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$CH$\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}$N$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ in an active nitrogen afterglow discharge. The spectra were recorded using the Fourier transform spectrometer associated with the McMath-Pierce Solar Telescope of the National Solar Observatory. A rotational analysis of 27 bands involving the excited state vibrational levels v = 9--22 and the ground state vibrational levels up to v = 12 has been obtained. A much improved set of spectroscopic constants have been determined for the v = 0--22 vibrational levels of the A$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$$\Pi$ state by combining the present measurements with those reported previously for the v = 0--8 vibrational levels of the A$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$$\Pi$ state and existing infrared and millimeter-wave measurements of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C$\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}$N. The 6--3, 7--4, 8--5 and 9--6 bands of the B$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$$\Sigma$$\mathrm{<mrow\; data-mjx-texclass="ORD">+</mrow>}$--A$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$$\Pi$ transition were also identified in the 23300--24000 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ region and were included in the final analysis. An experimental line list and calculated term values are provided.