Excitation-ionization of the calcium atom by electron impact

被引:4
|
作者
Stevenson, M [1 ]
Crowe, A [1 ]
机构
[1] Univ Newcastle Upon Tyne, Sch Nat Sci Phys, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
关键词
D O I
10.1088/0953-4075/37/12/005
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Double differential cross sections, measured using an electron-photon coincidence method, are reported for the 4p(2)P(3/2) excited state of Ca+ produced by electron interaction with the 4s(2) S-1 ground state of the calcium atom. The cross section at an incident electron energy of 400 eV is dominated by indirect processes involving 3p excitation to states lying 31.4-31.6 eV above the atomic ground state. These then autoionize to the observed 4p P-2(3/2) ion state. Other indirect processes involving states with binding energies in the range 27-41 eV, including triply excited states, are also observed. Preliminary measurements of the linear Stokes parameters at the peak of the main resonance give P-1 = -0.09 +/- 0.01 and P-2 = 0.01 +/- 0.01.
引用
收藏
页码:2493 / 2500
页数:8
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