Open Access

Table 1

Identification of the ions composing the reference mass spectrum thanks to the mass shifts observed with the 15N and 13C isotopic labeled experiments.

Block m/z Shift with 15N Shift with 13C Ion
C2 28 +2 0
28 0 +2
29 0 +2
29 +2 0 N2H+
30 +1 +1

C3 42 +1 +2 CH3CNH+
42 +2 +1
43 +2 +1

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