Perturbed -Angular -Correlation Spectroscopy on Indium- and Cadmium- Complexes in Silicon Carbide

1994 ◽  
Vol 339 ◽  
Author(s):  
J. Meier ◽  
D. Forkel-Wirth ◽  
T. Licht ◽  
U. Reislöhner ◽  
M. Uhrmacher ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Axially Symmetric ◽  
Pac Spectroscopy ◽  
Electric Field Gradients ◽  
Cadmium Complexes ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Nitrogen Doped ◽  
Field Gradients

ABSTRACTComplex formation at indium and cadmium impurities implanted into samples of 3C-, 4H-and 6H- SiC was investigated by means of Perturbed Angular Correlation (PAC)-Spectroscopy. After annealing at 1600 K up to five different configurations characterized by their specific electric field gradients (EFG(i)) were observed in 6H- SiC, only four complexes in 4H- SiC; in the 3C- modification no complex was observed. All EFG's are axially symmetric and are oriented along the c- axis of the crystal. In a highly nitrogen doped 6H- SiC epi- layer an new EFG was observed. It is tentatively assigned to a close indium- nitrogen pair.

Zirconia Characterization by Perturbed Angular Correlation Spectroscopy

1986 ◽  
Vol 73 ◽  
Author(s):  
Herbert Jaeger ◽  
John A. Gardner ◽  
Ohn C. Haygarth ◽  
Robert L. Rasera
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Simple Point ◽  
Stabilized Zirconia ◽  
Electric Field Gradients ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Field Gradients ◽  
Pure Zirconia ◽  
Cation Sites

ABSTRACTPerturbed Angular Correlation spectroscopy of 181Ta nuclei occupying cation sites has been used to investigate microscopic structural properties of several pure and stabilized zirconia materials. The PAC spectra are used to derive the electric field gradients at the tracer nucleus. Thse are compared with calculations based on a simple point-ion model. Agreement between experiment and theory is good for stabilized material and qualitatively reasonable for pure zirconia.

scholarly journals Lattice Sites of Cd in Ferroelectric BaTiO3`

2002 ◽  
Vol 57 (6-7) ◽  
pp. 613-616
Author(s):  
M. Dietrich ◽  
C. Camard ◽  
M. Deicher ◽  
F. Richter ◽  
V. Samokhvalov ◽  
...  
Keyword(s):  
Radioactive Isotope ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Coupling Constants ◽  
Axially Symmetric ◽  
Electric Field Gradients ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Field Gradients ◽  
Quadrupole Coupling ◽  
Lattice Damage

The radioactive isotope 111mCd was implanted into BaTiO3 in order to measure electric field gradients (EFGs) with Perturbed Angular Correlation spectroscopy (PAC). It is possible to anneal the implantation induced lattice damage to a certain extent. Then, 111mCd probes are positioned at two sites with distinct axially symmetric EFGs characterized by the quadrupole coupling constants of 33.9(9) and 69.8(9) MHz. These EFGs can be assigned to 111mCd at the Ti- and the Ba-sites

scholarly journals Perturbed Angular Correlation Studies in SrTiO3 Single Crystals

2000 ◽  
Vol 55 (1-2) ◽  
pp. 237-241
Author(s):  
P. de la Presa ◽  
K. P. Lieb ◽  
M. Uhrmacher ◽  
L. Ziegeler
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Hyperfine Interactions ◽  
Correlation Spectroscopy ◽  
Quadrupole Frequency ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Temperature Range ◽  
Field Gradients ◽  
Electronic Defects ◽  
Asymmetry Parameters

The quadrupole hyperfine interactions of 111Cd/111 In probe nuclei in single-crystalline SrTiO3 perovskite samples were investigated using Perturbed Angular Correlation spectroscopy. Three electric field gradients were detected and their fractions and hyperfine parameters were measured in the temperature range from 26 to 700 K. The fraction f0 having a vanishing quadrupole frequency, as expected for 111Cd on substitutional sites in a cubic lattice, starts to develop around 300 K and reaches 100% at 700 K. Two well-defined EFG's having closely lying quadrupole frequencies and asymmetry parameters of ωQi = 49.1(3) Mrad/s, 77, η0= 0.10(2) and ωQ2 = 51.8(3) Mrad/s, η2 = 0.12(2), at room temperature, were identified in the temperature range from 250 to 530 K, and their (100) orientation in the lattice was determined. They are associated with electronic defects at the probe atoms.

Perturbed angular correlation spectroscopy and its application to metal sites in proteins: possibilities and limitations

1985 ◽  
Vol 18 (1) ◽  
pp. 1-64 ◽  
Author(s):  
Rogert Bauer
Keyword(s):  
Angular Correlation ◽  
Gamma Rays ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Present Review ◽  
Coordination Geometry ◽  
Pac Spectroscopy ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Zinc Enzymes ◽  
Metal Site

The present review describes the methodology of perturbed angular correlation of gamma rays (PAC) applied to biological problems. A large part of the present review focuses on the application of PAC spectroscopy to the study of coordination geometry for the metal site in zinc enzymes. Applications to conformation and dynamics of biomolecules and the use of the method to identify the intracellular sites of either metals or labelled proteins are also discussed.

Defects in CdS: In detected by perturbed angular correlation spectroscopy (PAC)

1991 ◽  
Vol 50 (1-4) ◽  
pp. 159-164 ◽  
Author(s):  
R. Magerle ◽  
M. Deicher ◽  
U. Desnica ◽  
R. Keller ◽  
W. Pfeiffer ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Perturbed Angular Correlation Spectroscopy
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