Formation of autoionizing Ne+ in grazing collisions

O. GRIZZI, E.A. SANCHEZ, J.E. GAYONE, L. GUILLEMOT, V.A. ESAULOV AND R.A. BARAGIOLA

SURFACE SCIENCE

ELSEVIER SCIENCE BV

Año: 2000 vol. 469 p. 71 - 79

0039-6028

We present a study of the production of neon autoionizing states during glancing scattering of 3?50 keV Ne+ on an Al(111) surface of varying degree of roughness. The projectile energy dependence of the intensity of neon autoionization peaks in the electron spectra indicates that the various autoionizing states fall into two main groups. At low keV energies, Ne(2p43s2) autoionizing states are formed, while at higher energies other peaks appear in the electron spectra with similar intensity. Some of these peaks may be due to low-lying 2p4nln¾l¾ states, whose population is aided by the motion of the projectile. Other peaks can be assigned to 2s2p5nl, 2s2p6nl and 2p3nln¾l¾ states. A study of the eVect of surface roughness shows that the production of excited states in grazing scattering is favored at rougher surfaces. For flat surfaces the peaks become broader and less intense, an eVect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.+ on an Al(111) surface of varying degree of roughness. The projectile energy dependence of the intensity of neon autoionization peaks in the electron spectra indicates that the various autoionizing states fall into two main groups. At low keV energies, Ne(2p43s2) autoionizing states are formed, while at higher energies other peaks appear in the electron spectra with similar intensity. Some of these peaks may be due to low-lying 2p4nln¾l¾ states, whose population is aided by the motion of the projectile. Other peaks can be assigned to 2s2p5nl, 2s2p6nl and 2p3nln¾l¾ states. A study of the eVect of surface roughness shows that the production of excited states in grazing scattering is favored at rougher surfaces. For flat surfaces the peaks become broader and less intense, an eVect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.43s2) autoionizing states are formed, while at higher energies other peaks appear in the electron spectra with similar intensity. Some of these peaks may be due to low-lying 2p4nln¾l¾ states, whose population is aided by the motion of the projectile. Other peaks can be assigned to 2s2p5nl, 2s2p6nl and 2p3nln¾l¾ states. A study of the eVect of surface roughness shows that the production of excited states in grazing scattering is favored at rougher surfaces. For flat surfaces the peaks become broader and less intense, an eVect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.4nln¾l¾ states, whose population is aided by the motion of the projectile. Other peaks can be assigned to 2s2p5nl, 2s2p6nl and 2p3nln¾l¾ states. A study of the eVect of surface roughness shows that the production of excited states in grazing scattering is favored at rougher surfaces. For flat surfaces the peaks become broader and less intense, an eVect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.5nl, 2s2p6nl and 2p3nln¾l¾ states. A study of the eVect of surface roughness shows that the production of excited states in grazing scattering is favored at rougher surfaces. For flat surfaces the peaks become broader and less intense, an eVect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.Vect of surface roughness shows that the production of excited states in grazing scattering is favored at rougher surfaces. For flat surfaces the peaks become broader and less intense, an eVect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.Vect that we ascribe to autoionization decay closer to the surface, based on previous numerical simulations of peak shapes. © 2000 Elsevier Science B.V. All rights reserved.