We report cross-section results from experimental and theoretical investigations into electron collisions with the 2-methyl–1,3-butadiene [C5H8] molecule. The current results are compared with our previous results for the 1,3-butadiene [C4H6] molecule, a structural homologue of 2-methyl–1,3-butadiene, to investigate how the methylation (the substitution of hydrogen atom by a methyl group) affects the shape and/or magnitude of the total cross sections (TCSs). Both experimental TCS energy dependencies have certain features in common: the Ramsauer–Townsend-like minimum located within 1.4–1.6 eV; the resonant maximum centered at 3.4 eV for the 2-methyl–1,3-butadiene molecule and at 3.2 eV for 1,3-butadiene; a weak shoulder in the vicinity of 7 eV; and the pronounced broad enhancement peaking around 8.5 eV for 2-methyl–1,3-butadiene and near 9.5 eV for 1,3-butadiene. The magnitude of the TCS for 2-methyl–1,3-butadiene appears to be higher than that for 1,3-butadiene over the whole investigated energy range. Closer analysis of data shows that the TCS for 2-methyl–1,3-butadiene can be reasonably reproduced by the sum of TCSs for 1,3-butadiene and half of the TCS for the ethane [C2H6] molecule—that stays for the TCS of the methyl unit [CH3]. That result can be extended to homologous series of methyl-substituted allenes, ethylenes, and acetylenes.
Authors
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1103/physreva.94.042706
- Category
- Publikacja w czasopiśmie
- Type
- artykuł w czasopiśmie wyróżnionym w JCR
- Language
- angielski
- Publication year
- 2016
