Superelastic Electron Scattering within a Magnetic Angle Changer: Determination of the Angular Momentum Transferred during Electron Excitation over All Scattering Angles

Theoretical modeling of resonant laser excitation of atoms in a magnetic field

“…Since does not depend on the scattering angle e , the value of can be used throughout all measurements of P lin e ( ) when the B-field is present (eg in regions where it is not possible to measure the super-elastic signal using a conventional spectrometer) . Experiments of this type have now been carried out and results are discussed in [4] and [22].…”

“…However, by writing equation (4) in normal ordering as above, it is then possible to directly relate the results of further operations to the classical analogies of spontaneous emission due to radiation reaction of the source Coulomb field upon itself [11].…”

“…Super-elastic scattering of electrons from laser prepared atoms is a powerful technique which can measure excitation cross sections for inelastic electron scattering [4,[16][17][18][19][20][21][22]. This is possible since super-elastic scattering can be considered as the time inverse of coincidence methods which time-correlate the electron that excites an atom with the photon emitted during relaxation.…”

“…In each case, it can be advantageous to employ a Magnetic Angle Changer (MAC) device so that the electrons which participate in the collision are steered into and out of the interaction region over all scattering geometries from 0° to 180° [2,6,7]. The MAC device has recently been employed in super-elastic scattering experiments from laser excited calcium atoms [4], and so it is essential to develop a model of the laser interaction to fully describe the collision process under study. An example of how this model is applied to super-elastic scattering of electrons from calcium is given in section 4.0 below.…”

“…de-excitation [4] or ionization [6] of the target. In each case, it can be advantageous to employ a Magnetic Angle Changer (MAC) device so that the electrons which participate in the collision are steered into and out of the interaction region over all scattering geometries from 0° to 180° [2,6,7].…”