The hyperfine induced 2s2p P0, P2 → 2s 2 S0 E1 transition probabilities of Be-like ions were calculated using grasp2K based on multi-configuration Dirac-Fock method and HFST packages. It was found that the hyperfine quenching rates are strongly affected by the interference for low-Z Be-like ions, especially for 2s2p P0 → 2s2 S0 transition. In particular, the trends of interference effects with ...

The crystal structure of the title compound, C(12)H(14)ClNO, was determined in order to confirm that the chiral center of the mol-ecule has an S configuration. The cyclo-hexa-none ring adopts a chair conformation. The 2-chloro-phenyl ring is slightly twisted from the axial C-N bond, with a N-C-C-C torsion angle of -5.7 (2)°. In the crystal, an inter-molecular N-H⋯O hydrogen bond links adjacent ...

In this paper, an explicit classification of smooth free involutions on S×S up to conjugation is obtained.