Precise Stark-Effect Measurements in theΣ2Ground State of CaCl

Abstract

By use of the molecular-beam microwave-optical double-resonance technique the first high-precision Stark-effect measurement of an alkaline-earth monohalide has been performed. Low-field Stark shifts of rotational transitions in the $v=0\mathrm{}$, $X{}_{}{}^2{}_{}{}^{}\Sigma$ state of CaCl exhibited an unexpectedly complicated field dependence which, however, has been shown to be in complete agreement with an exact theoretical calculation.