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Electron collisions with methyl-substituted ethylenes: Cross section measurements and calculations for 2-methyl–2-butene and 2,3-dimethyl–2-butene
Abstract
We report electron-scattering cross sections determined for 2-methyl–2-butene [(H3C)HC==C(CH3)2] and 2,3-dimethyl–2-butene [(H3C)2C=C(CH3)2] molecules. Absolute grand-total cross sections (TCSs) were measured for incident electron energies in the 0.5–300 eV range, using a linear electron-transmission technique. The experimental TCS energy dependences for the both targets appear to be very similar with respect to the shape. In each TCS curve, three features are discernible: the resonant-like structure located around 2.6–2.7 eV, the broad distinct enhancement peaking near 8.5 eV, and a weak hump in the vicinity of 24 eV. Theoretical integral elastic (ECS) and ionization (ICS) cross sections were computed up to 3 keV by means of the additivity rule (AR) approximation and the binary-encounter-Bethe method, respectively. Their sums, (ECS+ICS), are in a reasonable agreement with the respective measured TCSs. To examine the effect of methylation of hydrogen sides in the ethylene [H2C=CH2 ] molecule on the TCS, we compared the TCS energy curves for the sequence of methylated ethylenes: propene [H2C=CH(CH3)], 2-methylpropene [H2C=C(CH3)2], 2- methyl–2-butene [(H3C)HC=C(CH3)2], and 2,3-dimethyl–2-butene [(H3C)2C=C(CH3)2], measured in the same laboratory. Moreover, the isomeric effect is also discussed for the C5H10 and C6H12 compounds.
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1063/1.4927703
- License
- Copyright (2015 AIP Publishing LLC)
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
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JOURNAL OF CHEMICAL PHYSICS
no. 143,
pages 1 - 11,
ISSN: 0021-9606 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Szmytkowski C., Stefanowska S., Zawadzki M., Ptasińska-Denga E., Możejko P.: Electron collisions with methyl-substituted ethylenes: Cross section measurements and calculations for 2-methyl–2-butene and 2,3-dimethyl–2-butene// JOURNAL OF CHEMICAL PHYSICS. -Vol. 143, (2015), s.1-11
- DOI:
- Digital Object Identifier (open in new tab) 10.1063/1.4927703
- Verified by:
- Gdańsk University of Technology
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