“…Such cleavage with 9,10-dideuteriotriptycene would result in a shift to (M -3) + and (M -5)+, and therefore to an increase in the intensity of these ions. 4 Table II lists the relative intensities of the doubly charged ions of species in the neighborhood of the (4) In order to definitely establish this point a mass spectrometer with resolution ( / ) of approximately 160,000 would be required. The author does not have access to such an instrument.…”