Dielectronic recombination computations of Rh-, Pd- and Ag-like W - PowerPoint PPT Presentation

Introduction Main work Future work Dielectronic recombination computations of Rh-, Pd- and Ag-like W with the FAC code Bowen Li School of Nuclear Science and Technology, Lanzhou University School of Physics, University College Dublin libw@lzu.edu.cn September 14, 2015

Introduction Main work Future work Contents Introduction 1 Main work 2 Rh-like W Pd-like W Ag-like W Future work 3

Introduction Main work Future work DR Process

Introduction Main work Future work DR Process

Introduction Main work Future work Important stages

Introduction Main work Future work 1. DR of Rh-like W

Introduction Main work Future work Published work

Introduction Main work Future work Energy level 9 7 8 1.2 10 1.2 9 6 5 4 10 7 6 8 3 2 4 1.0 5 1.0 3 2 8 4f 2 1=4d 0.8 0.8 8 4f5l 2=4d 1 (E c -E 0 )/E I 8 5s5l 3=4d 0.6 0.6 8 5p5l 4=4d 1 8 4f6l 5=4d 8 5s6l 0.4 6=4d 0.4 8 5d5l 7=4d 8 4f7l W Gd 8=4d 0.2 0.2 8 5p6l 9=4d 8 5f5l 10=4d 0.0 0.0 Figure: Energy levels of doubly excited configurations within the 4d complexes relative to the first ionization limit E I (565 eV for Gd and 1128 eV for W) which is indicated by the dashed line. E 0 is the gound states energy of Pd-like Gd and W.

Introduction Main work Future work Energy level 8 10 1.4 Gd 1.4 W 9 7 10 8 5 9 1.2 1.2 4 5 3 7 4 3 1.0 2 1.0 6 2 (E c -E 0 )/E I 0.8 0.8 6 1 1 1 0.6 0.6 5 4d 10 4f 1=4p 5 4d 9 4f 2 1 6=4p 0.4 5 4d 10 5l 0.4 2=4p 5 4d 9 4f 1 5l 7=4p 5 4d 10 6l 3=4p 5 4d 9 4f 1 6l 8=4p 0.2 5 4d 10 7l 0.2 4=4p 5 4d 9 5s 2 9=4p 5 4d 10 8l 5=4p 5 4d 9 5p 2 10=4p 0.0 0.0 Figure: Energy levels of doubly excited configurations within the 4p complexes relative to the first ionization limit E I (565 eV for Gd and 1128 eV for W) which is indicated by the dashed line. E 0 is the gound states energy of Pd-like Gd and W.

Introduction Main work Future work 4d and 4p complex -9 10 1 1 10 -10 3 ) -1 2 -10 10 s 3 -11 2 Rate coefficients (cm 10 3 4 -11 10 -12 10 -12 10 5 -13 4 10 1 = sum(4p) 1 = sum(4d) 2 = 4p 5 4d 9 4fn l ' ' 8 ' ' 2 = 4d 4fn l 5 10 ' ' -13 3 = 4p 4d n l 10 8 ' ' 3 = 4d 5ln l -14 10 5 9 ' ' 4 = 4p 4d 5ln l 8 ' ' 4 = 4d 6ln l 5 9 ' ' 5 = 4p 4d 6ln l 1 10 100 100010000 1 10 100 100010000 T (eV) T (eV) e e Figure: Partial DR rate coefficients for 4d and 4p core excited complexes of W.

Introduction Main work Future work n dependence Figure: The DR rate coefficients where an incident electron is captured to the different orbitals of W.

Introduction Main work Future work DR rate -9 1 = Total 5 10 1 2 = NRS 3 = RS -1 ) 4 = scale -3 s 5 = sum(4d) -10 10 Rate coefficients (cm 6 = sum(4p) 3 2 5 3 -11 10 6 1 6 4 4 -12 10 2 1 10 100 1000 10000 T e (eV) Figure: Contributions from the RS and NRS transition as well as different core excitations to total DR rate coefficients as a function of Te in Rh-like W.

Introduction Main work Future work Recombination process

Introduction Main work Future work Section conclusions Dielectronic recombination process is important. The 4p complexes contribute is aroud 25% to the total DR rate coefficients. The contributions from NRS transitions are significantly enhanced for W when compared with Gd as a result of lowering of energy levles relative to the ionization limit.

Introduction Main work Future work 2. DR of Pd-like W † Bowen Li et al. in preparing

Introduction Main work Future work Earlier work

Introduction Main work Future work 4d and 4p complex Figure: Contributions from the RS and NRS transition as well as different core excitations to total DR rate coefficients as a function of Te in Pd-like W.

Introduction Main work Future work DR rate Figure: Contributions from the RS and NRS transition as well as different core excitations to total DR rate coefficients as a function of Te in Pd-like W.

Introduction Main work Future work Section conclusions Very big discrepancy with Safronova et al. . Need new experiment or other calculations. ∆ n = 0 and ∆ n = 1 are important.

Introduction Main work Future work 3. DR of Ag-like W † Bowen Li et al. in preparing, without extrapolation

Introduction Main work Future work Energy level 900 800 Relative energy (eV) 700 600 500 400 300 200 s p d f g h s p d f g h Configurations

Introduction Main work Future work Energy level 900 800 Relative energy (eV) 700 600 500 400 300 200 s p d f g h s p d f g h s p d f g h s p d f g h Configurations

Introduction Main work Future work Complex Total -8 10 4f-complex 4d-complex -1 ) 4p-complex -9 -3 s 10 Rate coefficients (cm -10 10 -11 10 -12 10 -13 10 0.1 1 10 100 1000 10000 T e (eV)

Introduction Main work Future work DR rate

Introduction Main work Future work Future work Check the Pd-like W data. Finish the calculations on Ag-like W. ...

Introduction Main work Future work Acknowledgement NWNU: Prof. Chenzhong Dong, as well as other members UCD: Prof. Gerry O’Sullivan I would like to acknowledge support from the Fundamental Research Funds for the Central Universities Grant No. lzujbky-2014-9, International scientific collaboration program by Gansu Provincial Science and Technology Department Grant No. 144WCGA163 and National Natural Science Foundation of China Grant No. 11404152 as well as financial support from a UCD-CSC scholarship award.

Introduction Main work Future work Thank you for your attention!