Knowledge Bank

Absorption spectra of the Schumann-Runge bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O10O$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O2$ have been photographed with high resolution in the wavelength region 175-198 nm. For the vibrational levels of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O10O$ with $v\prime 9$ and of $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O2$ with $v\prime =8,9$ and 11, the bands become relatively sharp and the triplet structures are partially or completely resolved. Rotational analyses have been reported at Ohio in 1986, and line center positions have now been used in least squares fits to obtain all relevant molecular constants. The spin-spin and spin-rotation constants of the different isotopes will be presented and discussed. This work is supported by NASA grant NAG S-484 to Smithsonian Astrophysical Observatory.