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Annihilation of positrons trapped at the (100) and (111) surfaces of Si

Fazleev N.; Kuttler K.; Fry J.; Weiss A. (1997)

We present results of theoretical studies of positron surface states and positron annihilation characteristics at the clean non reconstructed (100) and (111) surfaces of Si performed within the modified atomistic, superposition ...
Auger-mediated sticking of positrons to surfaces: Evidence for a single-step transition from a scattering state to a surface image Potential bound State

Mukherjee S.; Nadesalingam M.; Guagliardo P.; Sergeant A.; Barbiellini B.; Williams J.; Fazleev N.; Weiss A. (2010)

We present the observation of an efficient mechanism for positron sticking to surfaces termed here Auger-mediated sticking. In this process the energy associated with the positrons transition from an unbound scattering ...
Interface defects of Al/GaAs(100) detected by Positron Annihilation Induced Auger Electron Spectroscopy (PAES)

Chen W.; Fazleev N.; Fry J.; Weiss A. (2001)

The interfacial layers between a metal overlayer and the semiconductor substrate are an integral part of semiconductor devices. As devices continue to shrink and epitaxial layers are made thinner, device performance has ...
Low-energy positrons at the Si(100)-2×1 surface with adsorbed hydrogen and oxygen

Fazleev N.; Fry J.; Weiss A. (2001)

Positron annihilation induced Auger spectra from the Si(100) surface exposed to hydrogen and oxygen are analyzed by performing calculations of positron surface states and annihilation characteristics of surface trapped ...
Measurement of the positron annihilation induced auger electron spectrum from Ag(100)

Joglekar P.; Shastry K.; Fazleev N.; Weiss A. (2013)

Research has demonstrated that Positron Annihilation Induced Auger Spectroscopy (PAES) can be used to probe the top-most atomic layer of surfaces and to obtain Auger spectra that are completely free of beam-impact induced ...
Oxidation and thermal reduction of the Cu(1 0 0) surface as studied using positron annihilation induced Auger electron spectroscopy (PAES)

Fazleev N.; Nadesalingam M.; Maddox W.; Mukherjee S.; Rajeshwar K.; Weiss A. (2010)

Changes in the surface of an oxidized Cu(1 0 0) single crystal resulting from vacuum annealing have been investigated using positron annihilation induced Auger electron spectroscopy (PAES). PAES measurements show a large ...
Positron annihilation induced Auger electron spectroscopic studies of reconstructed semiconductor surfaces

Fazleev N.; Reed J.; Starnes S.; Weiss A. (2011)

The positron annihilation induced Auger spectrum from GaAs(100) displays six As and three Ga Auger peaks below 110 eV corresponding to M4,5VV, M2M4V, M2,3M4,5M4,5 Auger transitions for As and M2,3M4,5M4,5 Auger transitions ...
Positron probes of the Ge(1 0 0) surface: The effects of surface reconstructions and electron-positron correlations on positron trapping and annihilation characteristics

Fazleev N.; Jung E.; Weiss A. (2007)

Positron annihilation induced Auger electron spectroscopy (PAES) has been applied to study the Ge(1 0 0) surface. The high-resolution PAES spectrum from the Ge(1 0 0) surface displays several strong Auger peaks corresponding ...
Positron states and annihilation characteristics at semiconductor surfaces

Fazleev N.; Fry J.; Weiss A. (1997)

Experimental PAES spectra from the (100) and (111) surfaces of Ge display several strong Auger peaks in the measured energy range corresponding to M4,5N1N2,3 M2,3M4,5M4,5 M2,3M4,5V , and M1M2,3N1,2,3 Auger transitions. ...
Positron states and annihilation characteristics at the (100), (110), and (111) surfaces of alkali metals

Fazleev N.; Fry J.; Weiss A. (1998)

In this paper we present results of theoretical studies of positron states and annihilation characteristics at the clean surfaces of alkali metals. Positron surface states and positron work functions have been computed for ...
Positron trapping at quantum-dot-like particles on metal surfaces

Fazleev N.; Fry J.; Nadesalingam M.; Weiss A. (2006)

Measurements of the positron annihilation-induced Auger electron (PAES) spectra from the Fe-Cu alloy surfaces with quantum-dot-like Cu nanoparticles embedded in Fe reveal a decrease of the Fe M2,3VV positron annihilation-induced ...
Positron-annihilation-induced Auger electron spectroscopy studies of the (100) and (111) surfaces of silicon

Fazleev N.; Kim J.; Fry J.; Weiss A. (2003)

Experimental results are presented which provide a direct comparison of spectra obtained using positron annihilation induced Auger electron spectroscopy (PAES) for two different faces of a semiconductor, Si(100)-(2 × 1) ...
Positrons as probes of Si(100) surface with adsorbed hydrogen and oxygen

Fazleev N.; Fry J.; Weiss A. (2000)

Positron annihilation induced Auger spectra from the Si(100) surface exposed to hydrogen and oxygen are analyzed by performing calculations of positron surface states and annihilation characteristics of surface trapped ...
Positrons at the (100) surface of alkali metals

Fry J.; Fazleev N.; Weiss A. (1997)

Positron surface states and positron work functions have been computed for the (100) surface of alkali metals. Stable surface states were found in all cases, with the Li state lying 0.5 eV below the bulk positron band, and ...
Search for positron trapping at quantum-dot like Cu nano particles on the surface of Fe using positron annihilation induced auger electron spectroscopy (PAES)

Nadesalingam M.; Kim S.; Fazleev N.; Fry J.; Nagai Y.; Hasegawa M.; Weiss A. (2004)

© (2004) Trans Tech Publications, Switzerland. This paper presents preliminary results of a search for evidence of trapping of positrons at quantum-dot like particles of Cu at the surface of Fe using positron annihilation ...
Studies of oxidation and thermal reduction of the Cu(100) surface using positron annihilation induced Auger electron spectroscopy

Fazleev N.; Nadesalingam M.; Maddox W.; Weiss A. (2011)

Positron annihilation induced Auger electron spectroscopy (PAES) measurements from the surface of an oxidized Cu(100) single crystal show a large increase in the intensity of the annihilation induced Cu M2,3VV Auger peak ...
Studies of oxidation of the Cu(100) surface using low energy positrons

Fazleev N.; Maddox W.; Nadesalingam M.; Rajeshwar K.; Weiss A. (2009)

Changes in the surface of an oxidized Cu(100) single crystal resulting from vacuum annealing have been investigated using positron annihilation induced Auger electron spectroscopy (PAES). PAES measurements show a large ...
Studies of positron states and annihilation characteristics at the reconstructed (100) surface of GaAs

Fazleev N.; Fry J.; Weiss A. (2003)

The high-resolution positron-annihilation-induced Auger spectrum from GaAs(100) displays six As and three Ga Auger peaks below 110eV corresponding to M4,5VV, M2M4V, M2,3M 45M45 Auger transitions for As and M2,3M 4,5M4,5 ...
Studies of positrons trapped at quantum-dot like particles embedded in metal surfaces

Fazleev N.; Nadesalingam M.; Weiss A. (2009)

Experimental studies of the positron annihilation induced Auger electron (PAES) spectra from the Fe-Cu alloy surfaces with quantum-dot like Cu nanoparticles embedded in Fe show that the PAES signal from Cu increase rapidly ...
Studies of the Auger spectrum from the (100) surface of GaAs using positron annihilation induced Auger electron spectroscopy

Fazleev N.; Starnes S.; Weiss A.; Fry J. (2000)

Measurements of the first high-resolution positron annihilation induced Auger spectrum from GaAs(100) are presented. The spectrum displays six As and three Ga Auger peaks below 110 eV, including a strong As M4,5VV peak at ...

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