LDPI ReTOF-MS of the organic residue produced by VUV irradiation of 100 ML thick C₂H₂ with a total fluence of 3 × 10¹⁷ photons cm⁻² fluence at 15 K. The mass spectrum is acquired at 300 K upon the annealing of the ice at an increased detector voltage of 3000 V. The complete list of detected mass signals is provided in Table 2. The deflected region is the mass range between m/z=18 and 34 where the ions are deflected upon the use of the PID technique.