FIELD: mass-spectrometry. SUBSTANCE: analyzer has two electrodes 1 and 2 whose effective profiles have at least one plane of symmetry. Effective profile of electrode 1 is formed by part of circumference and two straight lines intersecting at angle α = 2π/n, where n = 2,3,4 ...; center of circumference coincides with point of intersection of straight lines and lies on plane of symmetry of electrode system. Second electrode 2 is angular and formed by lines asymptotically approaching straight lines of electrode 1. EFFECT: improved resolving power and sensitivity due to reduced field distortion. 5 dwg
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