Knowledge Bank

From an analysts of the rotationally resolved fluorescence of $NO2$ excited by a narrow band (0.03 {\AA}) tunable dye laser, $\mathrm{<mrow\; data-mjx-texclass="ORD">1,2</mrow>}$ quantum numbers have been assigned to 80 transitions in the 6l25 {\AA} region. Three band origins are observed in a 20 {\AA} interval, two of which have also been seen in a nozzle beam seeded with $NO2.3$ A rotational analysis of the 6125 {\AA} and 6127 {\AA} bands is reported, while the small number of transitions assigned to the 6117 {\AA} band presently prevents analysis. Under collision-free conditions ($\le 1$ mTorr) the ``average” radiative lifetimes of the 6117 {\AA} band and the 6125 {\AA} band are $58\pm 6\mu$ sec and $73\pm 7\mu$ sec, respectively. Comments are made concerning the vibrational overlap in this region.