Fig. 2
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LDPI ReTOF-mass spectra recorded with PID at an increased voltage of 2775 V (Red) and without PID at a base voltage of 2480 V (Black). Both spectra are obtained for 100 ML thick unirradiated C2H2 ice at 15 K. The high sensitivity mass spectrum shows a wealth of spectral features belonging to C2H2 clusters at masses m/z=52(C2H2)2+, 78(C2H2)3+, 104(C2H2)4+, 130(C2H2)5+, 156(C2H2)6+, and 182(C2H2)7+.
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