Energy Characteristics of Ions Transmitted by a Quadrupole Mass Filter

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Abstract
An idealized model of the quadrupole electric field predicts that ions leaving the exit aperture of a mass filter can have transverse energy as high as 0.7 Vac, and axial energy equal to that of the incoming ions. A retarding field measurement using a cylindrically symmetric collector has shown that the total energy of transmitted ions is much lower than expected, and has a narrow distribution around the incident ion energy. The energy distribution has been determined for several ions to mass 264 and is found to be mass-dependent. The low energy of emergence and narrow energy distribution indicate possible utility in vacuum applications where a mass-resolved and directed ion beam is required. Improved ion optical design data are available for applications requiring the use of a mass-resolved beam, for instance in detector remote from filter.

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