Dissociative electron attachment to nitroethane:C_2H_5NO_2

摘要

Dissociative electron attachment (DEA) to nitroethane(C_2H_5NO_2) in the gas phase is studied using a crossed electron-molecule beams technique.The ion yields for particular fragment ions were measured in the electron energy rnage form 0 to 9.5 eV with an electron energy resolution of about 120 meV.In contrast to previous studies additional negatie ions,i.e.,HCN~- and NO~-,were observed.measures for the absolute partial cross sections were obtained for the ions using a calibration technique involving a comparison with the known cross section of the 0.8eV peak in DEA to CCl_4.The dominant neative ion product is NO~-_2 with a cross section of approximately 11X10~-22 m~2 at 0.75eV.The vlues of the cross section estimates for the other ions are about sigma9C_2H_3NO~-_2) =4X10~-24 m~2 at approx 0 eV,sigma(O~-)=5X10~-24 m~2 at 5.7 eV,sigma(OH~-)=2X10~-24 m~2 at 5.7 eV,sigma(CN~-)=5X10~-24 m~2 at 1.7eV,sigma(CNO~-)=3X10~-25 m~2 at approx 4.5 eV,sigma(HCN~-)=3X10~-25m~2 at approx 8eV.