Abstract
A new geometry of a magnetic angle changer (MAC) device is proposed, which allows experiments to be run on electron impact excitation of long-lived states of target atoms. The details of the device’s design are presented and discussed together with a numerical analysis of its magnetic field.
Highlights
A magnetic angle changer (MAC) [1,2] was invented two decades ago as a device which allows the running of low-energy electron collisional experiments in the full range of scattering angles when a crossed-beam geometry is applied
The selected MAC, among all the geometries we found, provided the best efficiency of bending the electron’s trajectories and the lowest angular spread of the beam
Numerical analysis shows its efficiency for electron beams typically used in electron scattering experiments
Summary
A magnetic angle changer (MAC) [1,2] was invented two decades ago as a device which allows the running of low-energy (below 100 eV) electron collisional experiments in the full range of scattering angles when a crossed-beam geometry is applied. The other way is to provide a near-zero magnetic field in the scattering region, allowing the Hanle-like effect to be reduced, as presented in our angular-correlation coincidence experiment on e-He scattering [10,20,21]. Both approaches are sufficient if the lifetime of the atomic state excited during the collision is short, of the order of a nanosecond. The zero magnetic field is available only at the center of the MAC, but the field reaches up to 0.1 mT in outer parts of the finite region This way, the Hanle-like effect of up to 30◦ would be observed in the outer layers of the scattering area. The experimental results would include the magnetic field’s effect averaged over the interaction region, which would be very difficult to deconvolve
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