Tong Xiao-Min

Relativistic Multichannel Theory: Theoretical Studies of Excited Energy Structure of Ar Atom

We here present a relativistic multichannel theory which can be regarded as an extension of traditional configuration interaction theories by including continuum configuration interactions. Our relativistic multichannel theory aims directly to calculate the compact set of physical parameters (μα,Uiα) in multichannel quantum defect theory. Taking Ar atom as an example, we compare our calculated orbital energies with traditional configuration interaction calculations as well as experimental measurements.

Relativistic Theoretical Calculation of O III: Radiative Transition Rates and the Bowen Mechanism in Planetary Nebulae

A full relativistic configuration interaction (RCI) calculation of transition energies and radiative transition rates involved in O III Bowen fluorescence mechanism is presented. The calculated ratios of transition line intensities are in good agreement with the observed ratios. The discrepancies between the RCI calculation and prediction based on LS coupling scheme show that a delicate balance between the electron correlations and the spin-orbital interactions should be important even for the low-Z O III ion.

Electron Impact Excitation Cross Section and Rate: Revised Bethe Formula

Based on Born approximation, we introduce a revised Bethe formula to calculate the excitation cross sections and rates conveniently for multi-electron atoms, whose generalized oscillator strength may have nodes and/or peaks. With the quasi-universal correction function, it can also be extended to low energy region.