Zeeman Effect and Stark Zeeman Effect on Formic Acid

Abstract

Zeeman effect and Stark Zeeman effect on rotational lines of formic acid were observed and analyzed. A theory of Stark Zeeman effect was given and applied to the analysis of the observed pattern. The diagonal elements of rotational g-tensor of HCOOH were determined to be g_aa=±0.263±0.007, g_bb=±0.099±0.005 and g_cc=±0.025±0.007. These values have the same sign.