Knowledge Bank

We have been able to measure some transitions in the $Na2$ and $Li2$ B-X system to an absolute accuracy of a few parts in $107$. A single frequency $Ar+$ laser is used to excite the known coincidences and the resulting fluorescence progression is made to lase on a few of its stronger red members. The laser gain exhibits an A.C. stark-induced feature which allows precise location, of the line center. At this point the laser (transition) wavelength is measured using a ``Lambda Meter”.$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$