Emission-line polarization degrees andnlmldistributions produced by state-selective electron capture in slow

E. Jacquet

¹

,

H. Kucal

²

,

V. Bazin

³

et al.

Abstract

Polarization degrees of lines emitted by Kr 7ϩ excited ions produced by single-electron capture during Kr 8ϩ ϩLi(2s) collisions were experimentally measured for projectile energies between 0.1 and 2.5 keV amu Ϫ1 . They were compared with theoretical polarization degrees obtained from nl m l distributions calculated by using the classical trajectory Monte Carlo ͑CTMC͒ method; radiative cascades have been included in the calculations. The fair agreement between experimental and calculated polarization degrees confirms the reliability of the CTMC method and allows one to analyze the m l distributions in terms of dynamical couplings responsible for the state-selective electron capture process.

Polarization degrees of 3p 2P3/2–3s 2S1/2transition in O5+(1s23p) produced in collisions of O6+with He and H2

“…where b is the impact parameter. Summation in (7) over magnetic substates m gives the nl-(subshell-)selective capture cross section, and summation over both m and l gives the n-(shell-)selective capture cross section. Obviously, the nlm-selective cross sections σ cx nlm are the most sensitive ones to the details of the electron capture dynamics.…”

“…Numerous experiments [4][5][6][7][8][9][10][11][12][13][14][15][16] have been devoted to the determination of photon polarization degrees in charge exchange collisions of ions with atoms and molecules. In the keV energy region, most of these experiments have measured the polarization degrees of light produced in singleelectron capture by highly charged ions from alkali atoms [4][5][6][7][8][9][10][11][12]. The polarization degrees were found to be large, 15 ∼ 40%.…”

Polarization degree differences for the3p 2P3/2–3s 2Liu1, Zhao2, Wang3 et al. 2010Phys. Rev. A6270View full textAdd to dashboardCite

“…This allows one to probe the collision dynamics on a more fundamental level. Numerous experiments have been devoted in the past [1][2][3][4][5][6][7][8] to the determination of photon polarization degree in collisions of multicharged ions with atomic and molecular targets. In the keV energy region, most of the experiments have measured the polarization of emitted radiation following the single-electron capture in collisions of highly charged ions with alkali-metal atoms [4][5][6], and polarization degrees of 15∼40% have been observed.…”

“…Numerous experiments have been devoted in the past [1][2][3][4][5][6][7][8] to the determination of photon polarization degree in collisions of multicharged ions with atomic and molecular targets. In the keV energy region, most of the experiments have measured the polarization of emitted radiation following the single-electron capture in collisions of highly charged ions with alkali-metal atoms [4][5][6], and polarization degrees of 15∼40% have been observed. However, in the experimental studies involving the charge transfer processes of He-like C 4+ , N 5+ , and O 6+ ions with He and H 2 targets [5,7,8], it was found that the polarization degree for the 3p 2 P 3/2 -3s 2 S 1/2 transition lies in two regions: 0∼7% for the O 6+ + He and N 5+ + H 2 collisions, and 17-21% and 16-24% for the N 5+ + He and C 4+ + H 2 collision systems, respectively.…”

Polarization spectroscopy of He+(nl)produced in collisions of He2+<

“…The information about the magnetic substate population allows one to probe the collision dynamics on a more fundamental level. Numerous experimental [1][2][3][4][5][6][7][8] and theoretical [9,10] studies have been devoted to the determination of photon polarization degree in collisions of multicharged ions with atoms and molecules. However, in the environment of hot dense plasmas, the Coulomb interaction between charged particles is screened which obviously affects the dynamics of atomic collision processes.…”