Related Experiment Video
Updated: Aug 6, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Photoexcitation of K-shell and L-shell hollow beryllium
Shuichi Hasegawa1, Fumiko Yoshida, Leo Matsuoka
1Department of Quantum Engineering and Systems Science, The University of Tokyo, Tokyo 113-8656, Japan. hasegawa@q.t.u-tokyo.ac.jp
Abstract:
We have observed K-shell and L-shell hollow beryllium atoms (2s(2)2p3s and 1s3s(2)3p) created by photoexcitation using synchrotron radiation. Resonance shapes were fitted to the Fano profile and the parameters were deduced. A Dirac-Fock calculation was performed to identify the configuration of the peaks and to predict other hollow atomic peaks. The results of the calculation were in good agreement with the experimental data. The comparison of the transition strength has revealed that the three-electron photoexcitation to the 1s3s(2)3p configuration is stronger than the two-electron photoexcitation to the 2s(2)2p3s configuration. This is attributed to the large overlap between the 2s orbital of the ground state (1s(2)2s(2)) with the orbital of the L-shell hollow state (1s3s(2)3p).
Related Concept Videos
The Energies of Atomic Orbitals
Electron Configuration of Multielectron Atoms
Electron Configurations
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
The Bohr Model
Electron Orbital Model
Hybridization of Atomic Orbitals I

