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Table 1

List of detected photoproducts.

No. of C m/z (decreasing intensity) Corresponding elemental composition Aromatic molecules identified using REMPI ReTOF-MS (Abplanalp & Kaiser 2020) Other molecules proposed based on the identifications of Abplanalp & Kaiser (2020) and analysis of our LDPI ReTOF-MS
3 391 C3H3+ m/z=40,39−C3H4 (propyne), R−C3H3 (propynyl group)
4 50, 51, 52, 49, 53, 54 C4H2+, C4H3+, C4H4+, C4H+, C4H5+, C4H6+ m/z=50,49−C4H2 (diacetylene); m/z=52,51,50− C4H4 (vinylacetylene)
6 78, 77, 79, 76 C6H6+, C6H5+, C6H7+, C6H4+ m/z=78,77−C6H6 (benzene) m/z=78,77−C6H6 (benzene), m/z=78−C6H6 (linear – hexadienyne)
7 91 C7H7+ m/z=91,92−C6H5CH3 (methylbenzene), C6H5CH2−R (substituted methylbenzene)
8 103, 104, 102, 105, 106 C8H7+, C8H8+, C8H6+, C8H9+, C8H10+ m/z=104,103−C6H5 C2H3 (phenylethylene); m/z=102 C6H5 CCH (phenylacetylene)
9 115, 117 C9H7+, C9H9+ m/z=115−R−CH2 C6H4 CCH or C6H5 CCCH2−R; m/z=117−R−CH2 C6H4 C2H3 or C6H5 C2H2−R (substituted phenylethylenes and phenylacetylenes)
10 129, 128, 130, 127 C10H9+, C10H8+, C10H10+, C10H7+ m/z=128,129,127−C10H8 (naphthalene)
11 141 C11H9+ m/z=141−C10H7CH2−R or R−C10H6CH3 (substituted naphthalenes)
12 155, 153, 156, 152, 154 C12H11+, C12 H9+, C12H12+, C12H8+, C12H10+ m/z=155−C10H7 C2H4−R or C10H7CH(−R) CH2; m/z=153−C10H7 C2H2−R
13 165, 167 C13 H9+, C13 H11+ m/z=165−C13H9−R (phenalene derivatives)

Notes. List of photoproducts after VUV irradiation of pure C2H2 ice at 15 K for a total fluence of 3 × 1017 photons cm−2 (16 minutes). The signals are grouped according to the total number of C atoms.

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