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The proton affinity and absolute heat of formation of cyclopropenylidene (c-C 3 H 2 ) have been derived from the translational energy threshold for endothermic proton transfer from c-C 3 H +3 to ammonia in a flowing afterglow triple quadrupole instrument: c-C 3 H +3 + NH 3 → c-C 3 H 2 + NH +4 . The cyclopropenium...
The geometrical factor β of infinitely long cylindrical ICR cells is determined to employ collision energy-resolved mass spectrometry (CERMS) with a FT-ICR spectrometer. In case of four identical infinitely long cylindrical electrodes β equals 0.90. A cylindrical ICR cell emulating infinitely long electrodes is used to study the energy-dependent collision-induced dissociation (CID) of EI + ...
Relative activation energies for dissociation of fullerene ions C z+n into C z+n-2 + C 2 have been determined for z = 1 and 2, covering the size range 52 ≤ n ≤ 70. These data are derived from measured appearance energies of fragment ions, obtained by electron impact ionization of C 70 , with the help of the finite heat bath theory...
Resonant electron capture spectra of C 60 F 48 and its oxy-analogue C 60 F 48 O have been studied and interpreted. Long-lived parent negative ions are formed within a 0-8 eV energy range with a maximum yield at approximately 0.14 eV. Going from thermal energy and up to 8 eV, these parent anions undergo fragmentation with generation of even-numbered...
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