Theoretical Studies On Low-energy Electron Scattering With CH₂ And GeH₂

Electron–molecule collision cross sections from very lowenergy up to threshold plays an important role in determiningelectron transport properties and the electron energy distributionof a swarm of electrons drifting through various gases.Then we took R-matrix method to deal with the low-energy electron collisions with germylene and methene.Low-energy electron collisions with germylene are studied in the correlated and uncorrelated approximations using the R-matrix method for the first time.We used static-exchange model?SE?,static-exchange-polarization model?SEP?and close-coupling model?CC?models to discuss the resonances.Lots of target calculations were performed to obtain the reliable target wave functions.In the part of scattering calculations,we didn't find obvious resonance on the elastic cross section we obtained,but on the excited cross section,there are two Feshbach resonances,belonging to ²B₂ and ²A₁ symmetries respectively,and a mixture of core-excited shape resonance Feshbach resonance belonging to ²A₂ symmetry.In addition,the differential and momentum-transfer cross sections of low-energy electron collisions with germylene are also computed.In the study of low-energy electron collisions with methene,after the selection of basis sets,we used CC model to calculate the elastic cross section,and find two obvious shape resonances,belonging to ²B₁ and ²A₁ symmetries.On the excited cross section of ground state to the lowest three excited state,there were three Feshbach resonances belonging to ²B₁,²B₂ and ²A₁ symmetries.To investigate the influence of multichannel coupling,we took single target CC model,15 targets CC model and 24 targets CC model into calculation to obtain the elastic cross sections and differential cross sections,the we found the cross section has converged at 15 targets.Besides,we also computed the differential cross sections and momentum-transfer cross sections of low-energy electron collisions with methene.Finally,we compared the two molecules we studied with silylene,and analysis the differences between carbon hydrides.