Xiao-Bin Ding

M1 transition energies and probabilities between the multiplets of the ground state of Ag-like ions with Z = 47–92

Extensive relativistic configuration interaction calculations have been performed for the 4d104f and 4d105s states of the Ag-like isoelectronic ion using the GRASP2K package based on the multi-configuration Dirac–Fock method. The active space techniques have been employed to extend the configuration expansion systematically. The electron correlation effects, Breit interaction and quantum electrodynamics effects to the atomic state wavefunctions and the corresponding energies have been taken into account. Good agreement has been obtained in a general trend with the existing experimental and theoretical values. The change of the ground state configuration from 4d105s to 4d104f is predicted to occur at Z = 62. The transition energy and probability of the M1 transition between the 4d104f multiplets are, respectively, scaled to be 0.01(Z*)4 cm−1 and 1.95 × 10−17(Z*)11.97 s−1, where Z* = Z − 34.42 is the effective nuclear charge number for Ag-like ions with Z ⩾ 62. Our results show the need for more high-precision experiments for Z ⩾ 68 ions.

Ab initio multi-configuration Dirac–Fock calculation of M1 visible transitions among the ground state multiplets of the W26 + ion

The development of fusion reactors has generated a demand for improved knowledge of the atomic properties of tungsten. Using a multi-configuration Dirac–Fock (MCDF) method with a restricted active space treatment, the wavelengths and transition probabilities of the M1 and E2 transitions in the visible light region are calculated for the ground state multiplets of W26 + ions. The theoretical wavelength (388.43 nm) for the 3H5 → 3H4 magnetic dipole transition agrees quite well with the experimental value (389.41 nm). Other transitions theoretically predicted at longer wavelengths are also in good agreement with new experimental observations. The results also indicate that the core–core correlation contributions from the 4d shell are essential to determine the transition properties accurately.

Collisional-Radiative Model for the visible spectrum of

Abstract Plasma diagnostics in magnetic confinement fusion plasmas by using visible spectrum strongly depends on the knowledge of fundamental atomic properties. A detailed collisional-radiative model of W 26+ ions has been constructed by considering radiative and electron excitation processes, in which the necessary atomic data had been calculated by relativistic configuration interaction method with the implementation of Flexible Atomic Code. The visible spectrum observed at an electron beam ion trap (EBIT) in Shanghai in the range of 332 nm to 392 nm was reproduced by present calculations. Some transition pairs of which the intensity ratio is sensitive to the electron density were selected as potential candidates of plasma diagnostics. Their electron density dependence is theoretically evaluated for the cases of EBIT plasmas and magnetic confinement fusion plasmas.

W^{26+}

A comprehensive theoretical study of the E1, M1, E2 transitions of Ca-like tungsten ions is presented. Using multi-configuration Dirac-Fock (MCDF) method with a restricted active space treatment, the wavelengths and probabilities of the M1 and E2 transitions between the multiplets of the ground state configuration ([Ne]3s

ions

^{2}

E1, M1, E2 transition energies and probabilities of W54+ ions

3p

Visible spectroscopy of highly charged tungsten ions

^{6}

Correlation, Breit and Quantum Electrodynamics effects on energy level and transition properties of W54+ ion

3d

Visible transitions of highly charged tungsten ions observed with a compact electron beam ion trap

^{2}

Theory of conjugate shake-up resonances adjacent to the sub-valence 2p photoionization of sodium atoms

) and of the E1 transitions between [Ne]3s