Ionized ethylidene ketene and its homologue methylene ketene

Multiplexed Photoionization Mass Spectrometry Investigation of the O(3P) + Propyne Reaction

“…A photoionization spectrum for the observed C 3 H 2 O product is shown in Figure . CBS-QB3 calculated AIEs for propadienal and 2-propynal are 9.13 and 10.74 eV, respectively, in close agreement with previous experimental determinations. − The calculated AIE for propadienal is indicated by a black arrow in Figure , and coincides with the observed onset of signal in the spectrum supporting minor formation of propadienal. However, the limitation of photoionization scans to energies less than 10.3 eV in the present measurements means we can neither confirm nor exclude production of 2-propynal from .…”

Ion-molecule chemistry of HnC3O+, C3O2+, and C3O+

“…kn-5 X 10"10 cm3 s'1 Terlouw et al have determined A//f°(HC30+) = 971 ± 5 kJ mol"1 from the measured appearance potential of HC30+. 26 This value, when linked with Botschwina's ab initio calculation for the proton affinity of C30 of 885 kJ mol*1,12 yields A//r0(C3O) = 326 kJ mol*1. Accurate branching ratios for the product channels of the reactions with NH3 and HCN could not be found under the conditions of the experiment because of low signal intensities and the fact that, in each case, one of the product ions was adjacent in mass to the reactant C30+ ion.…”

Photochemically triggered cheletropic formation of cyclopropenone (c-C3H2O) from carbon monoxide and electronically excited acetylene

“…As shown in Fig. S2 (ESI†), The IEs of propynal (HCOCCH, 7 ), cyclopropenone (c-C 3 H 2 O, 3 ), and propadienone (H 2 CCCO, 8 ) are 10.52–10.62 eV, 50 9.22–9.32 eV, 33 and 9.04–9.14 eV, 51 respectively, corrected for the Stark effect by the electric field of the ReTOF-MS optics. 52 Therefore, two photon energies of 10.49 eV and 9.20 eV are required to detect cyclopropenone.…”

“…Arrows and dashed lines represent the excitation energies used in the experiments. .62 eV, 50 9.22-9.32 eV, 33 and 9.04-9.14 eV, 51 respectively, corrected for the Stark effect by the electric field of the ReTOF-MS optics. 52 Therefore, two photon energies of 10.49 eV and 9.20 eV are required to detect cyclopropenone.…”