Doppelresonanzuntersuchung der Hyperfeinstruktur des 5² P _3/2-Terms im K I-Spektrum zur Bestimmung des elektrischen Kernquadrupolmoments des K⁴⁰

Abstract

The double-resonance method has been used to measure the hyperfinestructure of the 5² P _3/2-term in the potassium I-spectrum, using a sample enriched in theK ⁴⁰ isotope. The interaction constants ofK ⁴⁰ have been determined to beA ⁴⁰=−(2.450±0.046) MHz andB ⁴⁰=−(1.31±0.33) MHz. From these the electric quadrupolmoment has been calculated to be

$$Q(K^{40} ) = - (0 \cdot 093 \pm 0 \cdot 025) \cdot 10^{ - 24} cm^2 .$$