Discrimination on masses in the quadrupole mass-analyzer with prefilters at various levels of resolving power

Discrimination level on masses in an analytical quadrupole mass-analyzer with prefilters for the levels of resolving ability equal R0.1 = 1.5M, M, 0.75M, 0.5M was determined experimentally, within the range of mass number 31-426 а.е.m. Discrimination level on heavy masses was shown to decrease with the decrease of the resolving ability. For example, for ions with mass 426 а.е.m. in a mass spectrum of perfluorotributylamine the discrimination on masses decreases more than 10 times at transition from R0.1 = 1.5M to R0.1 = 0.5M. Comparison of levels of discrimination on masses in a quadrupole mass-analyzer with prefilters with the relative intensity of the same ionic peaks of the tabular mass spectrum was obtained on a magnetic mass-analyze.