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85037488479
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note
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+ ions (m/z 121.065335).
-
-
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44
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37049078533
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The most recent photoelectron spectrum of acetophenone reveals that there are two excited electronic states of the acetophenone molecular ion within a 0.5 eV of the lowest ionization energy. See G. Distefano, G. Granozzi, P. R. Olivato, S. A. Guerrero, J. Chem. Soc. Perkin Trans. 2 1987, 1459.
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45
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85037470911
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note
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Obtaining a reliable quantitative number for the fractional yields of each ionic species from these experiments is not straightforward since the extent of processes (1a) and (1b) prior to ion isolation introduces considerable uncertainty.
-
-
-
-
46
-
-
85037465368
-
-
note
-
Notice that the percentages are different from those shown in Figure 2. These differences reflect the fact that in this experiment ion isolation was achieved at much later times after ion formation resulting in considerable depletion of the molecular ion by dissociation during the long filament current pulse.
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48
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84989103149
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-1 in the acetone case. See R. Zhao, R. Tosh, A. Shukla, J. Futrell, Int. J. Mass Spectrom. Ion Processes 1997, 167/168, 317.
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85037477254
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note
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We have not explored the possibility of a 1,5-hydrogen migration from the ring to the carbonyl system but this would not appear to be very likely due to the geometric constraints of the aromatic ring.
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0034695395
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Note added in proof: A full report on the fact that the catalyzed isomerization of the acetophenone keto molecular ion to the enol form proceeds by a 1,3-hydrogen migration has just been published, see: G. van der Rest, J. Chamot-Rooke, N. Nedev, P. Mourgues, H. E. Audier, Int. J. Mass Spectrom. 2000, 195, 385.
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