Kinetic energy distribution for the ionization and dissociation process of C2H4 by electron impact

Light element atom, molecule and radical behaviour in the divertor and edge plasma regions

Wang, X.^1,2 ; Chen, Z.^1,2 ; Wei, B.^1,2 ; Hutton, R.^1,2 ; Zou, Y.^1,2

Applied Ion Beam Physics Laboratory, Fudan University, Key Laboratory of the Ministry of Education, Shanghai

200433, China^1

Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai

200433, China^2

关键词: Dissociation process;    Dissociative ionization;    Ethylene molecules;    Incident electrons;    Kinetic energy distributions;    Kinetic energy release;    Partial cross section;    Supersonic jet expansion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/576/1/012011/pdf
DOI  :  10.1088/1742-6596/576/1/012011

来源: IOP

【 摘 要 】

The dissociative ionization of ethylene molecules following impact by electrons in the energy range of 20 to 200 eV has been studied with a cold target recoil-ion momentum spectrometer (COLTRIMS). The relative partial cross sections for the ionic fragments C2Hn+(n=0∼3) with respect to C2H4+were plotted as a function of the incident energy. By measuring the time of flight and position of the fragment ions, the kinetic energy distribution has been deduced. Taking advantage of the supersonic jet expansion, the thermal motion contributing to the kinetic energy distribution of the recoil-ions was reduced. The average kinetic energy of the recoil ions as a function of the incident electron energy has also been plotted. Furthermore, the average kinetic energy release for the dissociation to C2H3+and C2H2+were estimated as 0.76 eV and 0.73 eV respectively.