Knowledge Bank

The spectrum of the oxy-hydrogen flame has been observed with high resolution ($\sim$$0.05cm-1$) between 2800--3500 $cm-1$ and 3940--4200 $cm-1$. Over 2000 lines have been measured with reproducibility of $\sim$$0.01cm-1$. Most of the strong lines have been assigned to high-J transitions in the following bands of $H2$: 001--000, 011--010, 021--020, 100--000, 002--001 and 101--100. In 001, 4 degenerate low-$Ka$ series can be followed in both R- and P- branches to $n\prime =2J\prime -Kn\prime =31$, providing accurate combination differences. Other higher-$Ka$ branches are assigned, fixing most of the ground-state energy levels up to $7000cm-1$. Difficulties in fitting the data to high-order centrifugal-stretching models will be discussed.