Explicitly correlated wave function for a boron atom

Authors:

• Mariusz Puchalski,
• Jacek Komasa,
• Krzysztof Pachucki

Abstract

We present results of high-precision calculations for a boron atom's properties using wave functions expanded in the explicitly correlated Gaussian basis. We demonstrate that the well-optimized 8192 basis functions enable a determination of energy levels, ionization potential, and fine and hyperfine splittings in atomic transitions with nearly parts per million precision. The results open a window to a spectroscopic determination of nuclear properties of boron including the charge radius of the proton halo in the B8 nucleus.