Proton Structure and Atomic Physics

Abstract

An ab initio study of the hyperfine structure in the X 2 Π electronic state of CCCH Phosphorus hyperfine structure in the electronic spectrum of the HPCl free radical Ab initio and molecular-dynamics studies on rare gas hydrides: Potential-energy curves, isotropic hyperfine properties, and matrix cage trapping of atomic hydrogen Abstract. We discuss a precise determination of the polarizability and other proton structure dependent contributions to the hydrogen hyperfine splitting, based heavily on the most recent published data on proton spin dependent structure functions from the EG1 experiment at the Jefferson Laboratory. As a result, the total calculated hyperfine splitting now has a standard deviation slightly under 1 part-per-million, and is about 1 standard deviation away from the measured value.