Knowledge Bank

We have measured the A-X visible system of the $H2O+$ and $D2O+$ using a ring dye laser and velocity-modulation spectroscopy. All previous experimental studies of this system have been in emission. Our $results1$ in $H2O+$ have much better measurement of intensities than previous $work2$. The best previous work in the visible on $D2O+$ was obtained by Lew and $Groleau3$, using emission spectroscopy of a discharge with a grating monochromator. They reported fragmentary results in the $V2=10\leftarrow 0$ band. Our new results in $D2O+$ are more extensive than previous work in this band, and disagrees with previous work by many standard deviations.