Measurement of molecular stopping cross sections of aldehydes and ketones and calculation of the atomic stopping cross section of oxygen in double-bonded and three-membered ring-structure C-H-O compounds

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Abstract
The molecular stopping cross sections of butyraldehyde, acetone, 2‐butanone, and 3‐pentanone have been measured for 0.3–2.0‐MeV He+ ions with probable random errors of 0.6–0.7%. The stopping cross sections of cyclopropane and ethylene have also been remeasured in order that the stopping cross sections of oxygen in aldehydes and ketones [εDB(O)] and in epoxides [εRING(O)] can be extracted. It is found that εDB(O) ≳εRING(O) ≳εSB(O) for E<0.7 MeV, where the subscripts DB, RING, and SB refer to oxygen in a double bond, in a three‐membered ring, and in a straight‐chained single bond, respectively.