Abstract
Absolute total cross sections (TCSs) for the electron scattering fromtwo structured isomers of C3H6 (propene and cyclopropane)have been determined over the energy range from 0.5 up to 370 eVin a linear electron-beam transmission experiment. TheTCS for propene is generally higher than that forcyclopropane, especially around the main maximum which in bothTCSs is centred near 9.5 eV. Besides this broadenhancement, already observed in earlier measurements, someadditional new TCS features - specific for eachtarget - have been noticed in the present experiment. The TCS for propene has a distinct resonant narrow peakvisible at around 2.2 eV. For cyclopropane, a very weak hump ataround 2.6 eV and a shoulder near 6 eV on the low-energy slopeof the cross section function are distinguishable. On thedescending side of the cross section energy dependence thechange of the slope is located at around 40 eV. These weakcyclopropane features seem to be common for cyclic molecules.The present results are compared with earlier C3H6TCS measurements available above 4 eV and with calculationsabove 10 eV. A distinct difference in magnitudes is visible,especially around the main maximum. On the basis of the presentpropene and previous hexafluoropropene data a fluorination effectis indicated and discussed.
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