ROTATIONAL ANALYSIS OF THE 6125 {\AA} REGION OF NITROGEN DIOXIDE

Abstract

From an analysts of the rotationally resolved fluorescence of $NO_{2}$ excited by a narrow band (0.03 {\AA}) tunable dye laser, $^{1,2}$ 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 $NO_{2}{.^{3}}$ 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 ($\leq 1$ 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.