Electron-ion recombination of Be-like ^(40)Ar^(14)+has been measured by employing the electron-ion merged-beams method at the cooler storage ring CSRm.The measured absolute recombination rate coefficients for collisio...Electron-ion recombination of Be-like ^(40)Ar^(14)+has been measured by employing the electron-ion merged-beams method at the cooler storage ring CSRm.The measured absolute recombination rate coefficients for collision energies from 0 to 60 eV are presented in Fig.1,covering all dielectronic recombination(DR)resonances associated with 2s^(2)→2s2p core transitions.In addition,strong trielectronic recombination(TR)resonances associated with 2s^(2)→2p^(2) core transitions were observed.Both DR and TR processes lead to series of peaks in the measured recombination spectrum,which have been identified by the Rydberg formula.Theoretical calculations of recombination rate coefficients were performed using the state-of-the-art multi-configuration Breit-Pauli(MCBP)atomic structure code AUTOSTRUCTURE to compare with the experimental results.The plasma rate coefficients for DR+TR of Ar14+were deduced from the measured electron-ion recombination rate coefficients in the temperature range from 10^(3) to 10^(7) K,and compared with calculated data from the literature.展开更多
The total recombination rate coefficients of Be-like 40Ar14+ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP.Fig.1 shows the recombination spectrum...The total recombination rate coefficients of Be-like 40Ar14+ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP.Fig.1 shows the recombination spectrum for electron energy from 0 to 58 eV in the center-of-mass frame.The resonant capture,involving the core excitation of an electron and two electrons,which is termed dielectronic recombination(DR)and trielectronic recombination(TR)individually and leads to series of peaks,have been preliminarily identified by extending downward in energy from their series limits with the Rydberg formula[1].展开更多
Heavy-ion storage rings equipped with electron coolers have been extensively used for electron-ion recombination studies.For dielectronic recombination(DR)experiments at the CSR,electron cooler is used for cooling of ...Heavy-ion storage rings equipped with electron coolers have been extensively used for electron-ion recombination studies.For dielectronic recombination(DR)experiments at the CSR,electron cooler is used for cooling of the ion beams as well as for electron target,where electron ion collision energy is detuned by changing the cooler cathode voltage.However,the absolute collision energy close to the cooling point could not be determined precisely in the recent^40Ar^14+DR experiment at the CSRm.Therefore,a novel method by utilizing a RF-buncher instead of the electron cooler to detune collision energy for electron-ion recombination measurement is proposed in this work.展开更多
基金National Natural Science Foundation of China(11320101003,91336102)。
文摘Electron-ion recombination of Be-like ^(40)Ar^(14)+has been measured by employing the electron-ion merged-beams method at the cooler storage ring CSRm.The measured absolute recombination rate coefficients for collision energies from 0 to 60 eV are presented in Fig.1,covering all dielectronic recombination(DR)resonances associated with 2s^(2)→2s2p core transitions.In addition,strong trielectronic recombination(TR)resonances associated with 2s^(2)→2p^(2) core transitions were observed.Both DR and TR processes lead to series of peaks in the measured recombination spectrum,which have been identified by the Rydberg formula.Theoretical calculations of recombination rate coefficients were performed using the state-of-the-art multi-configuration Breit-Pauli(MCBP)atomic structure code AUTOSTRUCTURE to compare with the experimental results.The plasma rate coefficients for DR+TR of Ar14+were deduced from the measured electron-ion recombination rate coefficients in the temperature range from 10^(3) to 10^(7) K,and compared with calculated data from the literature.
基金National Natural Science Foundation of China(11320101003,91336102)。
文摘The total recombination rate coefficients of Be-like 40Ar14+ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP.Fig.1 shows the recombination spectrum for electron energy from 0 to 58 eV in the center-of-mass frame.The resonant capture,involving the core excitation of an electron and two electrons,which is termed dielectronic recombination(DR)and trielectronic recombination(TR)individually and leads to series of peaks,have been preliminarily identified by extending downward in energy from their series limits with the Rydberg formula[1].
基金National Natural Science foundation of China(11504388),Youth Innovation Promotion Association CAS and BMBF.
文摘Heavy-ion storage rings equipped with electron coolers have been extensively used for electron-ion recombination studies.For dielectronic recombination(DR)experiments at the CSR,electron cooler is used for cooling of the ion beams as well as for electron target,where electron ion collision energy is detuned by changing the cooler cathode voltage.However,the absolute collision energy close to the cooling point could not be determined precisely in the recent^40Ar^14+DR experiment at the CSRm.Therefore,a novel method by utilizing a RF-buncher instead of the electron cooler to detune collision energy for electron-ion recombination measurement is proposed in this work.
