EXCITON AUTOIONATION IN ION INDUCED ELECTRON EMISSION.

N. BAJALES; L. CRISTINA; S. MENDOZA; R. A. BARAGIOLA; E. C. GOLDBERG; J. FERRON

PHYSICAL REVIEW LETTERS

Año: 2008 vol. 100 p. 2276041 - 2276044

0031-9007

We report on measurements of electron emission spectra from surfaces of Highly Oriented Pyrolytic Graphite (HOPG) excited by 1-5 keV He+ and Li+ which, for He+, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. for He+, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. for He+, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. for He+, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. + and Li+ which, for He+, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. +, exhibit a previously unreported high-energy structure. Through a full quantum dynamic description that allows for the calculation of neutralization and electron-hole pair excitation processes, we show that these high-energy electrons can arise from autoionization of excitons formed by electron promotion to conduction band states close to the vacuum level. The same calculation shows no excitation of high energy exciton for Li+ on HOPG, in agreement with the experimental absence of high energy electrons. energy electrons. energy electrons. energy electrons. + on HOPG, in agreement with the experimental absence of high energy electrons.