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Transpector CPM Operating Manual
5.3.3.3 Fragmentation Factors
The fragmentation factor is the fraction of the total ion current contributed by ions
of the chosen mass. Only peaks contributing at least one percent to the total ion
current are included in the list. The sum of the factors for all the peaks in a mass
spectrum cannot exceed 1.00. The sum can be less than 1.00 if only some of the
peaks are listed (either there are many peaks, or some of the ions produced lie
outside the mass range of the particular instrument used).
The data presented in Table 5-8 on page 5-28 are typical fragmentation factors for
some common gases at an electron energy of 70 eV. These fragmentation factors
can vary considerably with electron energy. For instance, at 35 eV the only
significant peak in argon is Ar
+
at 40 AMU.