Beam-scanning system for determination of beam profiles and form factors in merged-beam experiments

Electron-impact dissociative excitation of H+2: low energy studies

“…F is determined by scanning the electron and ion beams both horizontally and vertically at three points along the interaction region [18]. The center-of-mass energy is given by:…”

Dissociative recombination of the methane family ions: rate coefficients and implications

“…The MEIBE apparatus and procedures have been described elsewhere in full detail (Auerbach et al, 1977;Keyser et al, 1979) so we only include a brief overview.…”

Experimental observation of laser-stimulated radiative recombination

“…An indirectly heated barium-oxide cathode emits a 100-//A electron beam which is merged with the protons using a trochoidal analyzer. The two beams interact over a distance of 8.6 cm, the overlap being measured at two points along the merging region using scanners which intersect the beams horizontally and vertically [8]. After the interaction region the ions are electrostatically analyzed and the protons are deflected into a Faraday cup.…”

“…1/2 (8) \~ signals is achieved by modulating the electron beam and counting the detector signal in and out of phase with this modulation. The background count rate is very low (typically 5 counts/min), but given the small cross sections being measured, counting times of up to 24 h per point are required to reduce statistical errors to acceptable levels.…”