Method and apparatus for confinement of ions in the presence of

Details Method and apparatus for confinement of ions in the presence of Method and apparatus for confinement of ions in the presence of

1996-08-13

1999-08-03

Chiesa, Richard L.

Gas separation: processes

Magnetic separation

95 78, 96 1, 96 3, 96 61, B03C 130

Patent

active

059319860

ABSTRACT:
The present invention is an apparatus and method for combining ions with a neutral gas and flowing the mixture with a radial flow component through a magnetic field so that the weakly ionized gas is confined by the neutral gas. When the weakly ionized gas is present in sufficient density, a weakly ionized non-neutral plasma is formed that may be trapped in accordance with the present invention. Applications for a weakly ionized non-neutral plasma exploit the trap's ability to store and manipulate ionic species in the presence of neutral gas. The trap may be connected to a mass spectrometer thereby permitting species identification after a fixed period of time. Delicate and/or heavy particles such as clusters may be held and studied in a "gentle" environment. In addition, the trap can provide a relatively intense, low-energy source of a particular ion species for surface implantation or molecular chemistry. Finally, a long trap may permit spectroscopy of unprecedented accuracy to be performed on ionic species.

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patent: 4830638 (1989-05-01), Priestley, Jr.
patent: 5037546 (1991-08-01), Janczak et al.
O'Neil et al, "Transport to Thermal Equilibrium of a Pure Electron Plasma", American Institute of Physics, Physics Fluids, vol. 22, No. 2, Feb. 1979.
Peurrung et al, "The Non-Neutral Plasma: an Introduction to Physics with Relevance to Cyclotron Resonance Mass Spectrometry", International Journal of Mass Spectrometry and Ion Processes, vol. 157/158, Sep. 17, 1995.

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