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1

Energy Loss of Excited Slow Ions in Electron Gas

100%

Moneta M.

Acta Physica Polonica A

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1999

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vol. 96

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issue 3-4

429-436

EN

The electronic energy loss and the straggling of the energy loss of the degenerate electron gas for excited H*-, He*-, He**-, and Li*-like ions were calculated. The results were compared with the corresponding characteristics for ions kept in the ground state. The linear response theory was used. The ion was described by the Hartree-Fock-Slater formalism and the medium by the dielectric function. The stopping and straggling effective charges Z_{ef} for the energy loss were analysed and they were found to differ from each other and to depend on the one-electron radius r_{s}, on the ion atomic number Z_{i}, and on the number of electrons N_{i} carried by the ion.

2

Effective Ion Charge

100%

Moneta M.

Acta Physica Polonica A

|

1996

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vol. 89

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issue 5-6

581-594

EN

The impact parameter dependent energy transfer and random stopping power for ions carrying electrons were determined within the first-order Born approximation. The ion and atom were described by many-electron ground states. The excitations and ionizations of both collision partners were taken into account, but exchange of electrons was neglected. With the Bethe sum rule and closure relation, the random stopping was shown to have the Bethe form. For the Moliere form factors the analytical results were obtained. The effective charge was discussed in the random and channelling conditions. Comparison with some previous calculations was carried out.

3

Stopping of Slow H-, He-, Li- and Be-Like Projectiles in Electron Gas

100%

Moneta M.

Acta Physica Polonica A

|

1998

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vol. 93

|

issue 5-6

775-783

EN

Results of calculations of the electronic stopping power and the energy loss straggling for low velocity H-, He-, Li- and Be-like projectiles in the degenerate electron gas are reported. The Hartree-Fock-Slater description of the projectile and the dielectric function method were used. The size parameter Z__{min} of the charge distributions calculated from a variational principle depends on the characteristics of the medium. The stopping and straggling effective charges Z_{ef} of a projectile were analysed. They were found to differ with each other and to depend on the one-electron radius r_{s}, on the projectile atomic number Z_{i} and on the number of electrons N_{i} carried by the projectile.

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3 Acta Physica Polonica A

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3 Moneta M.

Energy Loss of Excited Slow Ions in Electron Gas

Effective Ion Charge

Stopping of Slow H-, He-, Li- and Be-Like Projectiles in Electron Gas