Knowledge Bank

The absorption measurements were obtained with a 21-ft concave-grating instrument operated in the fourth and fifth orders with microwave excited argon and krypton continua being used as background sources. Observations were made on the following band systems: $ a^{1}\Pi_{g}-X^{1}\Sigma^{+}{g}(v^{1} = 0-15), a^{1} \Sigma^{-}{u}-X^{1}\Sigma_{g}(v^{1} = 0-19), B^{1}\ {^{3}}\Sigma^{-}{u}-X^{1}\Sigma{g} (v^{1} = 0-18), C {^{3}}\Pi_{u}-X^{1}\Sigma_{g}(v^{\prime}=0-2)$. Rotational analyses were performed on all bands except the (0-0) band of the a-X system. $N14-N15$ isotope bands of the $a-X(v\prime 1=3-11)$ system were also observed and analyzed. Two completely independent analyses were done on each band. Sharp lines were reproduced to $\pm 0.03cm-1$. $Bv$ 's appear to be good to $\pm 0.0003cm-1$. Band origins are reproduced to within the accuracy of the standards, $\pm 0.15cm-1$. The isotope corrections of Dunham do not adequately reproduce the measured constants of the $N14-N15$ system. Potential curves and Franck-Condon factors are being calculated. Plate density readings on all bands have been made.