Impurity gettering by cavities in Si investigated with the PAC technique

2002 ◽  
Vol 190 (1-4) ◽  
pp. 846-850 ◽  
Author(s):  
J. Bartels ◽  
R. Vianden ◽  
M.C. Ridgway
Keyword(s):  
Pac Technique

Localization of Hydrogen in B and in Doped Silicon by ion Channeling and PAC

1987 ◽  
Vol 104 ◽  
Author(s):  
Th. Wichert ◽  
H. Skudlik ◽  
H. -D. Carstanjen ◽  
T. Enders ◽  
M. Deicher ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Lattice Site ◽  
Ion Beam ◽  
Tetrahedral Site ◽  
Ion Channeling ◽  
Pac Technique ◽  
Doped Silicon ◽  
Bond Center ◽  
Silicon Doped ◽  
Center Site

ABSTRACTThe lattice site of H/D atoms in silicon doped with B and 111In atoms is investigated using the ion channeling and perturbed γγ angular correlation (PAC) technique. The results indicate that at 295 K the antibonding site is occupied by H/D and that this site is easily transformed into a near tetrahedral site under the influence of an analyzing ion beam. Based on PAC results, the population of a second site, possibly a bond-center site, is expected at low temperatures.

Recrystallisation of Preamorphized Silicon Investigated by RBS and PAC

1996 ◽  
Vol 420 ◽  
Author(s):  
G. Rohrlack ◽  
K. Freitag ◽  
R. Vianden ◽  
R. Gwilliam ◽  
B. J. Sealy ◽  
...  
Keyword(s):  
Experimental Data ◽  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Radioactive Isotope ◽  
Perturbed Angular Correlation ◽  
Lattice Structure ◽  
Amorphous Layer ◽  
Microscopic Scale ◽  
Pac Technique

AbstractThe technique of preamorphization is a well-known method to avoid channeling tails of implanted dopants when fabricating devices. This is achieved by implanting a nondopant atom to produce the amorphous layer. We studied the recrystallisation of silicon preamorphized by Si, Ge and Sn implants. The recrystallisation was investigated by RBS and the y-y perturbed angular correlation (PAC) technique. RBS provides information about the thickness and the perfection of the recovered layer. Additional experimental data are supplied by the PAC technique, which used the postimplanted radioactive isotope 111Ina s a probe atom. The recovery of the lattice structure in the vicinity of the probe atoms is monitored on a microscopic scale via the electric field gradient produced at the site of the In nucleus by the surrounding lattice defects. The results are discussed and compared to the RBS data.

O-27 Agreement between 4-D echocardiography computed cardiac output and standard PAC technique is poor

2011 ◽  
Vol 25 (3) ◽  
pp. S12
Author(s):  
Rajesh P. Bhavsar ◽  
Peter Juhl-Olsen ◽  
Jacob Raben Greisen ◽  
Erik Sloth ◽  
Carl-Johan Jakobsen
Keyword(s):  
Cardiac Output ◽  
Pac Technique

scholarly journals PAC Synthesis and Comparison of Catalysts for Direct Ethanol Fuel Cells

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 712
Author(s):  
Alexandra Kuriganova ◽  
Daria Chernysheva ◽  
Nikita Faddeev ◽  
Igor Leontyev ◽  
Nina Smirnova ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Supported Catalysts ◽  
Active Surface ◽  
Carbon Surface ◽  
Active Surface Area ◽  
Ethanol Fuel ◽  
Direct Ethanol Fuel Cells ◽  
Onset Potential ◽  
Co Stripping ◽  
Pac Technique

Pt/C, PtMOn/C (M = Ni, Sn, Ti, and PtX/C (X = Rh, Ir) catalyst systems were prepared by using the pulse alternating current (PAC) technique. Physical and electrochemical parameters of samples were carried out by x-ray powder diffraction (XRD), transmission electron microscopy (TEM), and CO stripping. The catalytic activity of the synthesized samples for the ethanol electrooxidation reaction (EOR) was investigated. The XRD patterns of the samples showed the presence of diffraction peaks characteristic for Pt, NiO, SnO2, TiO2, Rh, and Ir. The TEM images indicate that the Pt, Rh, and PtIr (alloys) particles had a uniform distribution over the carbon surface in the Pt/C, PtRh/C, PtIr/C, and PtMOn/C (M = Ni, Sn, Ti) catalysts. The electrochemically active surface area of catalysts was determined by the CO-stripping method. The addition of a second element to Pt or the use of hybrid supported catalysts can evidently improve the EOR activity. A remarkable positive affecting shift of the onset potential for the EOR was observed as follows: PtSnO2/C > PtTiO2/C ≈ PtIr/C ≈ PtNiO/C > PtRh/C ≈ Pt/C. The addition of SnO2 to Pt/C catalyst led to the decrease of the onset potential and to significantly facilitate the EOR. The long-term cyclic stability of the synthesized catalysts was investigated. Thereby, the PtSnO2/C catalyst prepared by the PAC technique can be considered as a promising anode catalyst for direct ethanol fuel cells.

Characterization of nanostructured HfO2 films using Perturbed Angular Correlation (PAC) technique

2010 ◽  
Vol 198 (1-3) ◽  
pp. 41-45 ◽  
Author(s):  
F. H. M. Cavalcante ◽  
M. R. Gomes ◽  
A. W. Carbonari ◽  
L. F. D. Pereira ◽  
D. A. Rossetto ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Pac Technique

Characterization of nanostructured HfO2 films using Perturbed Angular Correlation (PAC) technique

2010 ◽  
pp. 387-391
Author(s):  
F. H. M. Cavalcante ◽  
M. R. Gomes ◽  
A. W. Carbonari ◽  
L. F. D. Pereira ◽  
D. A. Rossetto ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Pac Technique

scholarly journals Electron-Gamma PAC: New Possibilities for NQI Studies

2000 ◽  
Vol 55 (1-2) ◽  
pp. 3-14
Author(s):  
J. G. Correia ◽  
J. P. Araújo ◽  
J. G. Marques ◽  
A. R. Ramos ◽  
A. A. Melo ◽  
...  
Keyword(s):  
State Physics ◽  
Perturbed Angular Correlation ◽  
Ion Beam ◽  
Interaction Techniques ◽  
Solid State Physics ◽  
Quadrupole Interactions ◽  
Nuclear Quadrupole Interactions ◽  
Pac Technique ◽  
Nuclear Quadrupole ◽  
New Applications

The application of hyperfine interaction techniques to problems in solid state physics has been stead-ily growing over the last decade with the use of radioactive ion beam facilities such as ISOLDE at CERN. New applications of the e--γ Perturbed Angular Correlation (PAC) technique are underway at ISOLDE using probe nuclei with highly converted cascades. In this paper we present the motivation for extend-ing PAC experiments to elements/isotopes not usable with the conventional γ-γ PAC technique. Examples will be shown where the long-lived 73As/ 73Ge, the short lived 127Ba/ 127Cs and the 197mHg/ 197Hg decay cascades are applied to measurements of nuclear quadrupole interactions in materials.

Characterization of Defect Structures by Perturbed Angular Correlation Technique

1986 ◽  
Vol 82 ◽  
Author(s):  
Thomas Wichert
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Probe Atom ◽  
Correlation Technique ◽  
Defect Structures ◽  
Pac Technique ◽  
Acceptor Atom ◽  
Cold Worked ◽  
Defect Interactions

ABSTRACTIn applications of the perturbed angular correlation (PAC) technique to the characterization of defect structures in materials conclusions are drawn from the local electric field gradient measured at the site of a radioactive probe atom. In metals, PAC has been very successful in labeling and identifying simple probe atom-defect pairs. Based on these results, new experiments were performed on defect structures in cold-worked samples, on the dynamics of He-defect interactions and on the growth of vacancy clusters. Recent results on interactions between the acceptor atom In and different donor atoms or intrinsic defects in Si indicate that PAC may provide atomistic information also in the case of semiconductor materials.

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