Radio frequency atomic hydrogen beam source

Abstract

A simple, convenient rf discharge source for the production of an intense beam of hydrogen atoms is described. The design and operation is such that the discharge tube can be operated over a period of several thousand hours, producing an intense beam with dissociation ∼95%.

Energy and angular distributions of electrons from ion impact on atomic and molecular hydrogen. I. 20–114-keVH++H2Gealy1, Kerby2, Hsu3 et al. 1995Phys. Rev. A358161View full textAdd to dashboardCite

“…The atomic hydrogen target is obtained by dissociating H, in a rf discharge source of the type described by Slevin and Stirling [14], obtained commercially [15]. Mounted on the top of the collision chamber, the source directs the target beam downward across the ion beam and directly into a diffusion pump with a pumping speed of 1700 l/s for hydrogen.…”

A polarized atomic hydrogen beam

“…Whether used as a probe of the weak interaction [1], as a testing ground for quantum electrodynamics [2], as a laboratory for metrology [3] and .the determination of the values of fundamental constants [4], or as a target for the study of basic atomic coIlisions [5][6][7][8], the hydrogen atom has continued to play a central role in our attempt to understand physical phenomena at their most basic level. As a consequence, much effort has been devoted to the development of atomic hydrogen beams, both ground state and excited state, both polarized and un polarized [9][10][11][12][13][14][15][16]. Since the late 1960's a large fraction of this effort has been directed toward the production of polarized proton, deuteron, and H-beams for applications to nuclear and particle physics [17].…”

A microwave discharge source operating at pressures of several atmospheres

“…Paper [3] presents an atomic oxygen beam source with a degree of é 2 dissociation of ~70% at a 350-Torr pressure for a 5-to 10% mixture of oxygen and argon, when the power in the discharge varies from 140 to 195 W. The generation of hydrogen atomic beams has a substantial problem, and the working pressures in the discharge at sufficiently high dissociation degrees are, as a rule, no more than 1 Torr [4][5][6][7][8].…”