L. L. Balashova

Directional effects of the molecular ion reflection from a crystal surface

Abstract The reflection of 30 keV molecular N+2 ions from the (100) face of copper crystal has been studied experimentally. Under the examined experimental conditions, the yield of the reflected molecular ions has been found to sharply increase when the primary ion incidence plane gets parallel to the axis of the surface semichannels formed by the close-packed atomic rows of a single-crystal target. The magnitude of the effect is more than 15 times as high compared with random orientation of the primary beam with respect to the irradiated crystal target.

The features of molecular ion dissociation for ion reflection from a copper single-crystal surface

Reflection of 30 keV molecular nitrogen ions from a (100) copper crystal face is studied for a variety of experimental geometries. The dependence of the ion intensity on the azimuthal angle of target rotation throughout the variation interval of glancing angles studied is much stronger for molecular ions reflected without dissociation compared with the dissociated ions.

Energy distributions of fast ionized recoils

Abstract The angular and energy distributions of fast ionized recoils produced under both single-crystalline and polycrystalline copper bombardment by 10–35 keV energy noble gas ions have been investigated. The distributions have been found to be strongly affected by regular arrangement of the target atoms. The obtained results are discussed in terms of the simple models of the process.

Energy distributions of fast ionized recoils ejected from crystals under ion bombardment

Abstract The angular and energy distributions of fast ionized recoils produced under copper irradiation by 10–35 keV energy argon ions have been investigated. The distributions have been found to be strongly determined by the regular arrangement of the target atoms. The results obtained are discussed in terms of a model similar to that suggested by Oen for the blocking effect.

Directional effects in the reflection of molecular ions with energies of tens of kev from crystal surface

Abstract The regularities of reflection of molecular nitrogen ions with a 30 keV initial energy from the (100) Cu crystal face have been studied experimentally. The ion fraction reflected without dissociation has been found to be a nonmonotonic function of crystallographic direction. The results obtained are discussed in terms of a two-atom model.

Effect of surface semichannels in fast recoil energy distributions

Abstract Directional effects in the energy distributions of fast ionized recoils ejected from copper under 30 keV energy argon ion bombardment were studied. As targets single crystal faces with different mutual arrangements of close-packed atomic rows and also a copper polycrystal were used. It was found that at aligned target orientation the energy distributions are much broader than for both random target orientation and for the polycrystalline target. It was also found that the energy distributions are affected by the mutual arrangement of close-packed atomic rows. The obtained results are discussed in terms of vibrating atomic rows.

Blocking effect for fast ionized recoils

The angular and energy distributions of fast ionized recoils produced under copper crystal irradiation by argon ions have been investigated. The distributions have been found to be strongly determined by regular arrangement of the target atoms. The obtained results are discussed in terms of the blocking model.

Energy dependences in ion scattering by crystals

Abstract The results of experimental study of the 10–35 keV argon ion scattering by the (100) face of a copper cyrstal are presented. The results obtained are discussed in terms of the model of correlated scattering by an atom pair and a close-Dacked atomic row.

Energy and spatial redistributions of the particle flux resulting from its interaction with the scattering center

Energy and intensity distributions of both projectiles and recoil atoms on the plane behind the scattering center at finite distance are calculated for different projectile-to-target mass ratio and different projectile energies. The projectile energy and intensity have been found to be double-valued or three-valued functions of the distance from the collision epicenter. At the same time, the recoil energy and intensity have proved to single-valued and double-valued functions of the distance from the collision epicenter for parallel and divergent projectile fluxes, respectively.

Orientation dependence of the survival fraction of molecular ions reflected from a single crystal

The experiment aimed at studying the 30 keV molecular nitrogen ion reflection from the (110)Cu single-crystal face has shown that the reflected molecular ion survival fraction is a strong and non-monotonic function of target orientation relative to the primary beam incidence plane.