Eur. Phys. J. D 35, 249-255 (2005)
https://doi.org/10.1140/epjd/e2005-00082-0

Probing the isomer, fluorination and bond effects in C₃H₆, cyclo-C₃H₆ and C₃F₆ molecules using electron impact

¹ Graduate School of Sciences, Kyushu University, Fukuoka 812-8581, Japan
² Department of Physics, Sophia University, Tokyo 102-8554, Japan
³ Physics Department, Chungnam National University, Daejeon 305-764, South Korea
⁴ Faculty of Engineering, Yamaguchi University, Ube 755-8611, Japan

Corresponding author: ^a c-makoch@sophia.ac.jp

Received: 31 March 2005
Revised: 17 April 2005
Published online: 7 June 2005

Abstract

We have carried out experimental and theoretical studies on electron scattering from the C₃H₆ isomers and C₃F₆ molecules and we report on total, differential as well as theoretical integral elastic cross-sections for these molecules. Vibrational excitation functions are also presented for the typical vibrational peaks in C₃H₆ and cyclo-C₃H₆ for the angle of 90, impact energy range of 1–16 eV and loss energies of 0.12 eV and 0.13 eV, respectively. In the cross-sections, clear differences in peak positions and magnitudes between the C₃H₆ isomers can be viewed as the isomer effect. The same is observed between C₃H₆ and C₃F₆ in a clear manifestation of the fluorination effect. The resemblance of the shape resonance in the cross-sections, observed at about 2.2 eV for C₃H₆ and 3.5 eV for C₃F₆, to those in C₂H₄ and C₂F₄ clearly points to the effect of the double bond in the molecular structures for these molecules. Theoretical analysis is performed to provide rationales for the scattering dynamics.