Complete density matrix of HeI 3p excited in fast grazing ion-surface collisions via “Hanle-effect”

Marsch, C.; Winter, H.

doi:10.1007/bf01418165

Cited by 7 publications

(5 citation statements)

References 27 publications

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“…3) yield a distinct propensity for populating the atomic px-orbital, aligned along the beam direction, over the py-orbital, aligned normal to the surface. This agrees qualitatively with experimental [32] and theoretical [5] findings. A propensity for Px-over pz-orbital population is also found (Fig.…”

Section: The Stokes Parameter S/i=(i(a-)-i(a+))/ (I(a-)+i(a+)supporting

confidence: 92%

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Na*(3p)-Formation under grazing scattering of Na+-ions at an Al(111) surface

Zimny

Borisov

1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Excited Na* (3 p)-atoms are observed in grazing surface-collision experiments with Na+-beams. Such atoms can be formed beyond a certain threshold velocity via resonant electron transfer between atomic and metallic conduction band levels due to motion of the atom relative to the surface of the metal ("kinematic resonance"). This mechanism is studied here theoretically employing two different techniques: the nonperturbative "Coupled Angular Mode" (CAM) method and the approximate "Transfer Hamiltonian" (TH) method. The calculated Na*(3p)-populations agree well with recent experimental results. Moreover, the complete density matrix of the Na* (3 p)-subspace has been computed with the TH-method for ion-energies between 10 and 300 keV.

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Section: The Stokes Parameter S/i=(i(a-)-i(a+))/ (I(a-)+i(a+)supporting

confidence: 92%

“…Due to reflection symmetry with respect to the scattering plane p-state density matrices can be written in the "natural base" {IM)} as [32] p= p(M= +1)…”

Section: Polarizationsmentioning

confidence: 99%

Na*(3p)-Formation under grazing scattering of Na+-ions at an Al(111) surface

Zimny

Borisov

1994

Z Phys D - Atoms, Molecules and Clusters

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“…Those stray fields are present in our setup, when the coil around the yoke is run with permanent currents. Then the polarization of light is modified by a "parasitic" Hanle-effect [29,33] in a very different way than by capture of polarized electrons. A simple criterion for experimental tests in this respect is obtained by a comparison of data for demagnetized and magnetized targets.…”

Section: Results and Analysis Of Datamentioning

confidence: 99%

“…The combinations LrpQA K SSp~,_ K" in (18) result from the corresponding qiq k (k~) and angular momentum coupling given by nonvanishing Wigner-symbols. In general, quadrupole polarizations ("alignment") of orbital angular momenta [28,29] and of spins and the corresponding coefficients axx, are relatively small, so that contributions of terms with K= 2 or K' = 2 will be neglected furtheron. Inserting (10) into (18) Inspection of (19) shows that a measurement of S/I does allow to deduce PL or Ps in only those cases, where the anisotropy with respect to L or S vanishes; i.e.…”

Section: Analysis Of Spin Polarization From Emission Of Fluorescementioning

confidence: 99%

“…atomic terms with L = 0 or S= 0 and nonmagnetic targets. In general, however, depending on the atomic term, on projectile energy, and on the geometry of collision and detection a substantial amount of polarization Pr is observed in grazing surface collisions [11,[28][29][30][31], so that a single measurement of S/I is not sufficient to obtain the relevant information. A simple solution in this respect is based on the fact that the magnetization of a target (and thus Pe and Ps) can be reversed simply by a reversal of the magnetizing field.…”

Section: Analysis Of Spin Polarization From Emission Of Fluorescementioning

confidence: 99%

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Capture of polarized electrons into excited terms of fast atoms during grazing surface collisions

Winter

1992

Z Phys D - Atoms, Molecules and Clusters

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Atoms, Molecules zo,,oo.r,, and ClustersAbstract. Fast ions are scattered from magnetized surfaces under grazing angles of incidence. During the interaction with the surface charge exchange is effective and results in a population of stable and excited atomic terms. This capture of electrons is characterized by anisotropic distributions of atomic orbital angular momenta and in addition -for magnetized targets -by anisotropic distributions of electronic spins. We will discuss in some detail, how these anisotropic distributions can be studied via the analysis of the state of polarization of the fluorescent light, emitted in electronic transitions from excited terms of free atoms after the impact with the surface. We show that a defined variation of the magnetization of the target affects the polarization of the emitted light in a characteristic way, which allows to deduce the electronic spin polarization of the atoms. The method implies some perspectives with respect to the study of magnetic properties of the vacuum-solid interface well above the topmost layer of surface atoms. 34.50.Fa of this paper is to outline in some detail the concepts and experimental procedures of our studies. PACS:We will discuss first the capture of polarized electrons into atomic terms during ion-surface collisions and its effect on the anisotropic distribution of angular momenta in free atoms. This anisotropy is investigated by the analysis of the (polarized) light emitted in transitions from excited atomic terms after the interaction with the surface. Based on a theoretical description of the coupling of anisotropic ensembles of angular momenta and spins, we obtain the atomic and electronic spin polarization from an analysis of the light polarization for defined settings of the magnetization of the target. Then we describe the application of this procedure to the capture of polarized electrons into a number of different excited terms of atoms/ions with different orbital angular momenta and multiplicities. After a presentation and discussion of our experimental results we will outline concepts of charge exchange in grazing surface collisions and its relevance and perspectives with respect to the capture of polarized electrons.

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Orientation of Na∗ atoms formed under grazing scattering at an Al surface

Borisov

Zimny

1996

Surface Science

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Complete density matrix of HeI 3p excited in fast grazing ion-surface collisions via “Hanle-effect”

Cited by 7 publications

References 27 publications

Na*(3p)-Formation under grazing scattering of Na+-ions at an Al(111) surface

Na*(3p)-Formation under grazing scattering of Na+-ions at an Al(111) surface

Capture of polarized electrons into excited terms of fast atoms during grazing surface collisions

Orientation of Na∗ atoms formed under grazing scattering at an Al surface

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