Nuclear Magnetic Resonance in Lead Telluride PDF Download
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Author: Charles Robert Hewes
Publisher:
ISBN:
Category : Lead compounds
Languages : en
Pages : 220
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Book Description
Nuclear magnetic resonance (NMR) measurements have been used to develop a detailed model of the energy band structure of PbTe in the vicinity of the valence and conduction band edges. In addition, the hyperfine couplings between the carrier states and the Pb207 and Te125 nuclei have been determined. A parameterized k.pi nonparabolic model for the valence band conduction bands has been developed which takes account of the k.pi couplings among the six bands near the Fermi level at the L point of the Brillouin zone. From this band model, expressions are developed for the Fermi energy dependence of the g factors, the nonparabolic density of states, and the carrier concentration and temperature dependence of the Knight shift. The hyperfine coupling between the Pb207 nuclei band the valence band states is found to be nearly equal to the coupling between the Pb207 nuclei and the conduction band states. Both hyperfine constants are more than an order of magnitude larger than the hyperfine constant of the Pb(6s) state for neutral atomic lead. Relativistic corrections are examined to account for the unusual magnitudes of both hyperfine constants. The Pb207 resonance lineshape and resonance position were used to observe a damaged-induced compensation effect in p-type PbTe, which was not observed in n-type material. (Author).
Author: Charles Robert Hewes
Publisher:
ISBN:
Category : Lead compounds
Languages : en
Pages : 220
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Book Description
Nuclear magnetic resonance (NMR) measurements have been used to develop a detailed model of the energy band structure of PbTe in the vicinity of the valence and conduction band edges. In addition, the hyperfine couplings between the carrier states and the Pb207 and Te125 nuclei have been determined. A parameterized k.pi nonparabolic model for the valence band conduction bands has been developed which takes account of the k.pi couplings among the six bands near the Fermi level at the L point of the Brillouin zone. From this band model, expressions are developed for the Fermi energy dependence of the g factors, the nonparabolic density of states, and the carrier concentration and temperature dependence of the Knight shift. The hyperfine coupling between the Pb207 nuclei band the valence band states is found to be nearly equal to the coupling between the Pb207 nuclei and the conduction band states. Both hyperfine constants are more than an order of magnitude larger than the hyperfine constant of the Pb(6s) state for neutral atomic lead. Relativistic corrections are examined to account for the unusual magnitudes of both hyperfine constants. The Pb207 resonance lineshape and resonance position were used to observe a damaged-induced compensation effect in p-type PbTe, which was not observed in n-type material. (Author).
Author: Michael Stuart Adler
Publisher:
ISBN:
Category :
Languages : en
Pages : 490
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1008
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 882
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Book Description
Author: Donald L. Moore
Publisher:
ISBN:
Category :
Languages : en
Pages : 97
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Book Description
Knight shift and spin-lattice relaxation time has been measured for Cd113 nuclei in In-doped CdTe. From the Korringa product and the sign of the Knight shift, the electron g-factor has been calculated to be g = -1.2 plus or minus .1, which is a factor of three greater than that previously reported from theoretical estimates. Spin-lattice relaxation is due to contact hyperfine interactions. Degenerate and non-degenerate theory was applied to calculate the atomic volume normalized electronic probability density and the hyperfine constant, A sub H. The CdSe experimental data indicated material constants a factor of three greater than known values; therefore, the results are inconclusive. (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 922
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Book Description
Author: Dudley Williams
Publisher: Elsevier
ISBN: 1483281418
Category : Science
Languages : en
Pages : 775
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Book Description
Methods of Experimental Physics, Volume 3: Molecular Physics focuses on molecular theory, spectroscopy, resonance, molecular beams, and electric and thermodynamic properties. The manuscript first considers the origins of molecular theory, molecular physics, and molecular spectroscopy, as well as microwave spectroscopy, electronic spectra, and Raman effect. The text then ponders on diffraction methods of molecular structure determination and resonance studies. Topics include techniques of electron, neutron, and x-ray diffraction and nuclear magnetic, nuclear quadropole, and electron spin resonance. The publication takes a look at mass spectrometry and molecular beams, including molecular structural applications, chemical kinetics, beam formation and detection, molecular beam optics, and spectroscopy. The text also considers the electric properties of molecules and ultrasonic studies and thermodynamic properties of fluids. The manuscript is a dependable reference for readers interested in molecular physics.
Author: John V. Guttag
Publisher:
ISBN:
Category : Computer science
Languages : en
Pages : 400
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Book Description
Author: Massachusetts Institute of Technology
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Book Description
Author: Vineet Kumar
Publisher: CRC Press
ISBN: 1351021605
Category : Medical
Languages : en
Pages : 419
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Book Description
Nanomaterials contain some unique properties compared to their bulk. Their unique properties are due to the chemical nature of the material, small size, and surface functionalization. Along with control over size, the functionalization of nanomaterials also affects their compatibility to the environment and living organisms. This book provides a detailed account of nanomaterials functionalization along with a brief overview of their application. This book serves as a reference for scientific investigators including doctoral and postdoctoral scholars and undergradate and graduate students who need to have knowledge of the basics of nanomaterial functionalization, recent advancements, challenges, and opportunities in this field. This book will also provide critical and comparative data for nano-technologists and may be beneficial for industry personnel, journalists, policy makers, and the general public to help understand functionalized nanomaterials in detail and in depth. Features: This book is comprehensive and covers all aspects of functionalized nanotechnology. It describes the challenges and methods of functionalized nanomaterials synthesis for different applications. It discusses the recent findings and cutting-edge global research trends on the functionalization of nanomaterials. It emphasizes the products and market, safety, and regulatory issues of functionalized nanomaterials. It contains contributions from international experts and will be a valuable resource for researchers.
