Dependence of discrimination on masses in the quadrupole mass-analyzer with prefilters on ion initial energy

Experimentally the relation of peak intensities in perfofluorine tributylamine mass spectrum within the range of mass numbers 31-502 a.e.m. obtained in a work with a small quadrupole mass-analyzer with prefilters for ion initial energies 2.5, 3.2, 4.6 and 6 eV was determined. Discrimination on heavy masses was shown to decrease with the increase of ion energy input in a mass-analyzer. In particular, the relation of ion peak intensity with a mass number 502 a.e.m. to intensity ion peak with a mass number 69 a.e.m. increases 5.6 times with the increase of ion initial energy from 2.5 to 6 eV. Decrease of resolving capacity on mass 502 a.e.m. from R01 = 590 to R01 = 375 and increase of absolute intensity of the ion peak with a mass number 502 a.e.m. was observed.