Knowledge Bank

Using transverse electric discharges KrF laser spectra were investigated at high resolution under various lasing conditions, and many absorption lines were observed in the laser spectrum in addition, to the absorption between the two peaks at 2484 and 2491 {\AA}. Except for the C I 2478.573 {\AA} absorption from the metastable $2p2\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}S$ state no possible impurity line or band can be attributed to these absorbing lines, even when two- or three-photon transitions, or absorption from excited states are taken into account. Two series, series I and II, converging to the same limit near $40308cm-1$ were found and analyzed as v^{\prime}-progressions of a doublet state. The $\Delta$ G-v curves of the series are well represented by straight lines of almost equal slopes, which give $\omega eXe(I)=2.165$ and $\omega eXe(II)=2.197cm-1$ Provided the absorption arises from the upper state of the laser emission, dissociation should occur to $Kr(5s[3/2]O)+F(2p5,2P)$. Assuming the weak series to be due to the isotopic molecule, $\mathrm{<mrow\; data-mjx-texclass="ORD">86</mrow>}$KrF, the following molecular constants were obtained by computer simulation: (The values in parentheses show the ranges of possible deviations due to experimental errors.)[FIGURE]