Optik 82(3), 99 (1989).
Inhomogenrous field Wien filters offer an alternative to the conventional uniform field Wien filter, magnetic sector or electrstatic deflector for electron-spin rotation. Their main advantage is the point-to-point stigmatic focusing property which preserves the cylindrical symmetry in a beam transport system. Both uniform and inhomogeneous field Wien filters may be used for spin rotation and/or energy/mass analysis. The complete transfer matrix of a general inhomogeneous field Wien filter is derived in a second order approximation. The matrix elements for the precession of the electron spin-polarization vector are included in a separate spin rotation matrix. Real entrance and exit fringing fields are included for the specialized case of a Wien filter with curved and normal (not inclined) entrance and exit pole faces. The transfer matrices are parameterized in terms of beam parameters and the multipole expansion coefficients of the filter's electric and magnetic fields.
Center for Nanoscale Science and Technology
NIST is an agency of the U.S. Department of Commerce
Website Comments:epgwebmaster@nist.gov