类氖和类钠钨离子LMM双电子复合过程的研究
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摘要
基于相对论组态相互作用理论方法,系统研究了类氖和类钠钨离子的LMM双电子复合过程(DR).考虑了电子关联效应、Breit相互作用、QED等效应,计算给出了LMM-DR过程相关的W63+,W62+离子单、双激发态的能级和相关的辐射、Auger几率,以及DR过程的强度和截面.基于理论计算,对Tokyo-EBIT实验测得的1.0~5.0keV能区的X射线谱进行了模拟和分析,理论计算很好地模拟并标识出了实验谱中来自W64+和W63+离子的共振峰.
In this article,ab initio calculations have been performed for the LMM dielectronic recombination(DR)strengths of Ne-like and Na-like tungsten ions in the ground state 2 s22 p6(1 S0)and2 s22 p63 s(2 S1/2),respectively.The energy levels,radiative transition rates and Auger rates are calculated using the Flexible Atomic Code based on relativistic configuration interaction approach for all of doubly excited states of W63+and W62+ions related with the LMM-DR process.In the calculations,electronic correlations,Breit interactions,and QED effects on energy levels are well considered.The calculated energies are compared with the experimental values from the NIST and EBIT measurements,and other calculations where available,excellent agreement has been obtained.The DR cross sections are presented by convoluting the resonance strength with a 50 eV wide(FWHM)Gaussian distribution as the same as the EBIT beam energy resolution,and compared with the experimental results.The theoretical results are in good consistent with the EBIT experimental measurements,and important resonance peaks are clearly identified.
In this article,ab initio calculations have been performed for the LMM dielectronic recombination(DR)strengths of Ne-like and Na-like tungsten ions in the ground state 2 s22 p6(1 S0)and2 s22 p63 s(2 S1/2),respectively.The energy levels,radiative transition rates and Auger rates are calculated using the Flexible Atomic Code based on relativistic configuration interaction approach for all of doubly excited states of W63+and W62+ions related with the LMM-DR process.In the calculations,electronic correlations,Breit interactions,and QED effects on energy levels are well considered.The calculated energies are compared with the experimental values from the NIST and EBIT measurements,and other calculations where available,excellent agreement has been obtained.The DR cross sections are presented by convoluting the resonance strength with a 50 eV wide(FWHM)Gaussian distribution as the same as the EBIT beam energy resolution,and compared with the experimental results.The theoretical results are in good consistent with the EBIT experimental measurements,and important resonance peaks are clearly identified.
引文
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[25]BEIERSDORFER P,LEPSON J K,SCHNEIDER M B,et al.L-shell X-ray emission from neonlike W64+[J].Physical Review A,2012,86(1):012509.
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[28]NAKAMURA N.Breit interaction effect on dielectronic recombination of heavy ions[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2016,49(21):212001.
[29]BRANDAU C,KOZHUHAROV C,LESTINSKY M,et al.Storage-ring experiments on dielectronic recombination at the interface of atomic and nuclear physics[J].Physica Scripta,2015(T166):014022.
[30]KRAMIDA A,RALCHENKO Y,READER J and NIST ASD Team(2018).NIST Atomic Spectra Database(ver 5.5.6)[EB/OL].[2018-05-14]https://physics.nist.gov/asd.
[31]SAFRONOVA U I,SAFRONOVA A S,BEIERSDORFER P.Excitation energies,radiative and autoionization rates,DS lines and DR rates for excited states of Mg-like W from Na-like W[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2009,42:165010.
[2]BEIERSDORFER P.Highly charged ions in magnetic fusion plasmas:research opportunities and diagnostic necessities[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2015,48(14):144017.
[3]STRATTON B C,BITTER M,HILL K W,et al.Passive spectroscopic diagnostics for magnetically confined fusion plasmas[J].Fusion Science and Technology,2008,53(2):431.
[4]BADNELL N R,O'MULLANE M G,SVMMERS H P,et al.Dielectronic recombination data for dynamic finte-density plasma-I.Goals and methodology[J].Astron Astrophys,2003,406:1151.
[5]KONAN G G,ZDEMIR L.Autoionization rates for sodium-and magnesium-Like tungsten and gold[J].Acta Physica Polonica A,2017,132(4):1290.
[6]BEIERSDORFER P,MAY M J,SCOFIELD J H,et al.Atomic physics and ionization balance of high-Z ions:Critical ingredients for characterizing and understanding high-temperature plasmas[J].High Energy Density Physics,2012,8(3):271.
[7]KRAMIDA A.Recent progress in spectroscopy of tungsten[J].Canadian Journal of Physics,2011,89(5):551.
[8]SKINNER C H.Applications of EBIT to magnetic fusion diagnostics[J].Canadian Journal of Physics,2008,86(1):285.
[9]PITTS R A,CARPENTIER S,ESCOURBIAC F,et al.A full tungsten divertor for ITER:physics issues and design status[J].Journal of Nuclear Materials,2013,438:S48.
[10]HIRAI T,ESCOURBIAC F,CARPENTIERCHOUCHANA S,et al.ITER tungsten divertor design development and qualification program[J].Fusion Engineering and Design,2013,88(9/10):1798.
[11]RIETH M,DUDAREV S L,DE VICENTE S M G,et al.Recent progress in research on tungsten materials for nuclear fusion applications in Europe[J].Journal of Nuclear Materials,2013,432(1-3):482.
[12]BEIERSDORFER P,CLEMENTSON J,DUNN J,et al.The ITER core imaging X-ray spectrometer[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2010,43(14):144008.
[13]LI B,O'SULLIVAN G,DONG C Z,et al.Dielectronic recombination of tungsten ions[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2016,49(15):155201.
[14]KWON D H,LEE W,PREVAL S,et al.Isonuclear tungsten dielectronic recombination rates for use in magnetically-confined fusion plasmas[J].Atomic Data and Nuclear Data Tables,2018,119:250.
[15]BEIERSDORFER P,CLEMENTSON J,SAFRONOVA U I.Tungsten data for current and future uses in fusion and plasma science[J].Atoms,2015,3(2):260.
[16]HAO L H,KANG X P.Energy levels and spectral lines for n=3to n=3transitions in mg-like tungsten Ions[J].Acta Physica Polonica A,2015,28(3).
[17]PREVAL S P,BADNELL N R,O'MULLANE M G.Partial and total dielectronic recombination rate coefficients for W73+to W56+[J].Physical Review A,2016,93(4):042703.
[18]WU Z,FU Y,MA X,et al.Electron impact excitation and dielectronic recombination of highly charged tungsten ions[J].Atoms,2015,3(4):474.
[19]BEHAR E,MANDELBAUM P,SCHWOB J L.Dielectronic recombination of Ne-like tungsten[J].Physical Review A,1999,59(4):2787.
[20]SAFRONOVA U I,SAFRONOVA A S,BEIERSDORFER P.Excitation energies,radiative and autoionization rates,dielectronic satellite lines,and dielectronic recombination rates for excited states of Na-like W from Ne-like W[J].Atomic Data and Nuclear Data Tables,2009,95(6):751.
[21]WATANABE H,NAKAMURA N,KATO D,et al.X-ray spectra from neon-like tungsten ions in the interaction with electrons[J].Plasma and Fusion Research,2007,2:027.
[22]BIEDERMANN C,RADTKE R,SEIDEL R,et al.Dielectronic and radiative recombination of Si-to N-like tungsten ions[J].Journal of Physics:Conference Series,2009,163(1):012034.
[23]GU M F,The flexible atomic code[J].Can J Phys,2008,86:675
[24]BEHAR E,PELEG A,DORON R,et al.Dielectronic recombination of Ni-,Cu-,and Ar-like tungsten and barium through the low inner-shell excited configurations including collision processes[J].Journal of Quantitative Spectroscopy and Radiative Transfer,1997,58(4-6):449.
[25]BEIERSDORFER P,LEPSON J K,SCHNEIDER M B,et al.L-shell X-ray emission from neonlike W64+[J].Physical Review A,2012,86(1):012509.
[26]KAPALE K T,QAMAR S,ZUBAIRY M S.Spectroscopic measurement of an atomic wave function[J].Physical Review A,2003,67(2):023805.
[27]BERNHARDT D,BRANDAU C,HARMAN Z,et al.Breit interaction in dielectronic recombination of hydrogenlike uranium[J].Physical Review A,2011,83(2):020701.
[28]NAKAMURA N.Breit interaction effect on dielectronic recombination of heavy ions[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2016,49(21):212001.
[29]BRANDAU C,KOZHUHAROV C,LESTINSKY M,et al.Storage-ring experiments on dielectronic recombination at the interface of atomic and nuclear physics[J].Physica Scripta,2015(T166):014022.
[30]KRAMIDA A,RALCHENKO Y,READER J and NIST ASD Team(2018).NIST Atomic Spectra Database(ver 5.5.6)[EB/OL].[2018-05-14]https://physics.nist.gov/asd.
[31]SAFRONOVA U I,SAFRONOVA A S,BEIERSDORFER P.Excitation energies,radiative and autoionization rates,DS lines and DR rates for excited states of Mg-like W from Na-like W[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2009,42:165010.