DUAL-FOCUSING MAGNETIC MASS SPECTROMETER Russian patent published in 2001 - IPC

FIELD: spectrometry; portable statistical devices for studying chemical and isotope composition of gaseous, liquid, and solid materials. SUBSTANCE: small-size magnetic mass spectrometer that enables simultaneous recording of particles within comprehensive range of masses whose number is limited only by resolving power of device without changing its size, weight, and resolving power has ion source; cylindrical capacitor; sector magnet whose dimensions are consistent with range of masses under measurement that incorporates two ports facing each other with their parallel surfaces to form planar aperture perpendicular to main optical axis; output aperture; and detector. Output aperture of sector magnet is made in the form of cylindrical surface with radius r and axis on magnet side perpendicular to planes of ports; mentioned cylindrical surface crosses main optical axis of magnet whose radius R_m, corresponds to heavier mass under measurement at its angular length γ_m, counted from input aperture plane of magnet. Here r-to-R_m ratio meets dependence (R_m/R₀)tg(3γ_m/2)≥r/R_m≥1, where R₀ is mean radius of cylindrical capacitor; π/3 ≥ γ_m≥ π/4. EFFECT: enhanced validity and measurement accuracy; reduced measurement time. 2 dwg, 1 tbl