Cross-sections for electron-scattering from 2-methyl-1-buten-3-yne, C 5 H 6 , molecules
tCross-sections for electron collisions with the 2-methyl-1-buten-3-yne [H2C C(CH3)C CH] moleculewere measured and calculated. Absolute grand-total electron-scattering cross-section (TCS) was takenat impact energies from 0.6 to 300 eV in the linear electron-transmission experiment. The TCS energydependence for the electron–C5H6collision has two prominent enhancements separated with a deepminimum located near 1.8 eV. In addition, in the low-energy TCS function two noteworthy features occur:(i) near 1 eV, a change in a slope on rapidly declining side of the TCS curve; (ii) between 2 and 5 eV, adistinct hump superimposed on the opposite, rising part of the curve. To search for the origin of thesefeatures in the TCS curve for C5H6, the comparison was made with results of the electron-scatteringstudies for selected hydrocarbon molecules. These features were attributed to the formation of short-living negative ions (resonant states). Elastic (ECS) and ionization (ICS) cross-sections for C5H6and C4H2(1,3-butadiyne) were computed up to 3 keV by means of the additivity rule (AR) approximation and thebinary-encounter-Bethe (BEB) approach, respectively. For the C5H6molecule, the sum ECS + ICS is in goodagreement with the experimental TCS for energies above about 40 eV.
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