Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics

Baum G, Raith W, Steidl H (1988)
Z.Phys. D 10(2-3): 171-178.

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This beam was developed as a target for a crossed-beam electron-atom scattering experiment on the interaction of a polarized spin-1/2 electron with a polarized spin-1 atom. In the future this beam will be used in "Spin-Polarized Metastable Atom Deexcitation Spectroscopy" (SPMDS) for studying ferromagnetic surfaces without and with adsorbate layers. We use a discharge source for producing a beam of metastable helium atoms, a permanent sextupole magnet with a central stop at its exit for selecting He(2^3 S) atoms in the Zeeman substate ms=+1, a zero-field spin flipper for reversing the atomic beam polarization with respect to a magnetic guiding field, and a Stern-Gerlach magnet for analyzing the atomic polarization. At a distance of 90 cm beyond the exit of the sextupole, in the "interaction region" of an experiment, the polarized beam has a circular cross section of about 6 mm FWHM and a particle density of 1·10^7 atoms/cm^3. The reversible spin polarization was determined asP=0.90±0.02. A possible contamination of the beam with metastable singlet atoms is included within this value; the ground-state He atoms are not considered to be part of the polarized beam. An observed contamination with long-lived Rydberg atoms can easily be destroyed by applying a high electric field.
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Baum G, Raith W, Steidl H. Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics. Z.Phys. D. 1988;10(2-3):171-178.
Baum, G., Raith, W., & Steidl, H. (1988). Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics. Z.Phys. D, 10(2-3), 171-178.
Baum, G., Raith, W., and Steidl, H. (1988). Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics. Z.Phys. D 10, 171-178.
Baum, G., Raith, W., & Steidl, H., 1988. Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics. Z.Phys. D, 10(2-3), p 171-178.
G. Baum, W. Raith, and H. Steidl, “Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics”, Z.Phys. D, vol. 10, 1988, pp. 171-178.
Baum, G., Raith, W., Steidl, H.: Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics. Z.Phys. D. 10, 171-178 (1988).
Baum, Günter, Raith, Wilhelm, and Steidl, Hans. “Production of a spin-polarized, metastable He(23 S) beam for studies in atomic and surface physics”. Z.Phys. D 10.2-3 (1988): 171-178.
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