Electron Attachment to Aliphatic Hydrocarbons of the Formnhyphen;CNH2Nplus;1Brlpar;Nthinsp;equals;thinsp;2ndash;6and8rpar;II. A Swarmhyphen;Beam Study

摘要

A swarmhyphen;beam study has been made of brominated hydrocarbons of the formnhyphen;CNH2Nplus;1Brlpar;Nthinsp;equals;thinsp;2ndash;6and8rpar;. At energies below sim;thinsp;3 eV the abundant ion found in the beam study was Brminus;. The dissociative attachment cross sectionsgr;dalpar;egr;rpar;peaked at 0.76, 0.74, 0.73, 0.70, 0.71, and 0.13 eV, and had peak values equal to 3.95, 4.14, 5.50, 6.13, 7.41, and 32.2thinsp;times;thinsp;10minus;18cm2forNthinsp;equals;thinsp;2ndash;6and8, respectively. A small decrease has been observed in the crosshyphen;section width with increasing reduced massMrof theRlpar;equals;thinsp;nthinsp;minus;thinsp;CNH2Nplus;1rpar;sngbnd;Brmolecules. This and the increase insgr;dawithMrare discussed within the resonancehyphen;scatteringhyphen;theory treatment of dissociative electron attachment to diatomic molecules. For some of the molecules studied, potential energy diagrams for RBr and RBrminus;* and separation and autoionization lifetimes for RBrminus;* are given.