Spin asymmetry parameters for electron-hydrogen scattering. II. Excitation of the n=2 states

For pt.I see ibid., vol.19, no.12, p.1817 (1986). Asymmetry parameters for the scattering of spin-polarised electrons by spin-polarised hydrogen atoms are presented for the 1s to 2s and 1s to 2p transitions and for the excitation of the n=2 level in the energy range 13.6-300 eV. The calculations are based upon sophisticated pseudostate approximations published in the literature. The results for the 1s to 2s transition are rather dramatic. Although it is anticipated that the first experiments will only be able to measure the asymmetry, A12, for the excitation of the whole n=2 level, it is shown that such measurements will provide insight into the individual 2s and 2p components since A12 is dominated by the 1s to 2p excitation at forward angles and, between 15.0 and 54.4 eV, by the 1s to 2s transition at backward angles. Comparison with the calculations of McDowell et al. (1984) at 35, 54.5, 100 and 200 eV reveal similarities in structure but significant differences in detail.

[1]  H. Walters,et al.  Spin asymmetry parameters for electron-hydrogen scattering. I. Elastic scattering , 1986 .

[2]  H. Walters,et al.  Elastic scattering and excitation of the 1s to 2s and 1s2p transitions in atomic hydrogen by electrons to medium to high energies , 1986 .

[3]  Callaway.  Scattering of electrons by atomic hydrogen at intermediate energies: Elastic scattering and n=2 excitation from 12 to 54 eV. , 1985, Physical review. A, General physics.

[4]  Lubell,et al.  Experimental study of spin-exchange effects in elastic and ionizing collisions of polarized electrons with polarized hydrogen atoms. , 1985, Physical review. A, General physics.

[5]  R. Potvliege,et al.  Elastic and inelastic scattering of electrons and positrons by atomic hydrogen at intermediate and high energies in the unitarised eikonal-Born series method , 1985 .

[6]  H. Walters.  Perturbative methods in electron- and positron-atom scattering , 1984 .

[7]  C. Joachain,et al.  The angular distribution of asymmetry in scattering of spin-polarised electrons by spin-polarised hydrogen atoms. II , 1984 .

[8]  M. Mcdowell,et al.  The angular variation of the asymmetry in scattering of spin-polarised electrons by hydrogen , 1983 .

[9]  M. Mcdowell,et al.  Electron impact excitation of atomic hydrogen at 35 and 54.4 eV , 1983 .

[10]  R. Roychoudhury,et al.  Elastic and inelastic scattering of electrons by atomic hydrogen at intermediate energies in a coupled-channel second-order potential model , 1982 .

[11]  M. Lubell,et al.  Measurement of spin-exchange effects in electron-hydrogen collisions: Further studies of impact ionization , 1982 .

[12]  J. Ree.  Electron-hydrogen scattering calculations at energies between 13.6 and 60 eV including n=3 levels , 1982 .

[13]  C. Tu,et al.  Measurement of Spin-Exchange Effects in Electron-Hydrogen Collisions: 90° Elastic Scattering from 4 to 30 eV , 1982 .

[14]  A. Kingston,et al.  Electron scattering by atomic hydrogen: the distorted-wave second Born approximation , 1980 .

[15]  M. Lubell,et al.  Application of a dc Fano effect polarized electron source to low-energy electron-atom scattering. , 1978, The Review of scientific instruments.

[16]  M. Lubell,et al.  Measurement of spin-exchange effects in electron-hydrogen collisions: Impact ionization. [15 to 197 , 1977 .

[17]  J. Callaway,et al.  Inelastic differential scattering of electrons by hydrogen atoms from 0.75-4 Ryd: n=2 states , 1976 .

[18]  P. Burke,et al.  ELECTRON SCATTERING BY ATOMIC HYDROGEN USING A PSEUDO-STATE EXPANSION. III. EXCITATION OF 2s AND 2p STATES AT INTERMEDIATE ENERGIES. , 1970 .