Download or read book The M ssbauer Effect in Surface Studies written by Robert Paul Godwin and published by . This book was released on 1966 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mossbauer Effect in Surface Studies Fe57 on W and on Ag written by J. W. Burton and published by . This book was released on 1966 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mossbauer effect at crystal surfaces is discussed. Fe57 on the surface of W and Ag has been measured under ultra-high vacuum. The W experiment yielded Debye temperatures of 406 plus or minus 12, 354 plus or minus 30, and 255 plus or minus 30K in the bulk, along the surface normal, and parallel to the surface, respectively. In Ag the bulk Debye temperature was 253 plus or minus 12K while the surface value was 380 plus or minus 30K and showed no angular dependence. Quadrupole splitting in both experiments indicated surface field gradients of about ( -3 x 10 to the 16th power Volts/cm2). (Author).
Download or read book The Moessbauer Effect in Surface Studies Fe57 on Ag written by Robert Paul Godwin and published by . This book was released on 1966 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mossbauer effect for atoms located at crystal surfaces is discussed. We show that the Einstein model is valid for describing qualitatively the mean square displacement of lattice atoms. The mean square displacement (Mossbauer recoilless fraction) and mean square velocity (Mossbauer second-order Doppler shift) of atoms in one and three-dimensional crystals with free surfaces are treated in a many-body approach. The simple models indicate that at high temperatures surface atom mean square displacements are on the order of twice bulk atom mean square displacements (or equivalently that surface atom Debye temperatures are about 1/square root of 2 times the corresponding bulk values) and that surface effects penetrate only a few atomic spacings into a crystal. A possible temperature dependence of the Mossbauer isomer shift due to anharmonic binding forces at surfaces is pointed out. The experimental difficulties faced in a surface Mossbauer study performed under ultrahigh vacuum conditions and the apparatus used in an attempt to overcome them are described. Mossbauer spectra of Fe(57) on LiF, in Ag, and on Ag have been obtained in the temperature range 100 to 400 K. (Author).
Download or read book Characterization of Solid Surfaces written by Philip F. Kane and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until comparatively recently, trace analysis techniques were in general directed toward the determination of impurities in bulk materials. Methods were developed for very high relative sensitivity, and the values determined were average values. Sampling procedures were devised which eliminated the so-called sampling error. However, in the last decade or so, a number of developments have shown that, for many purposes, the distribution of defects within a material can confer important new properties on the material. Perhaps the most striking example of this is given by semiconductors; a whole new industry has emerged in barely twenty years based entirely on the controlled distribu tion of defects within what a few years before would have been regarded as a pure, homogeneous crystal. Other examples exist in biochemistry, metallurgy, polyiners and, of course, catalysis. In addition to this of the importance of distribution, there has also been a recognition growing awareness that physical defects are as important as chemical defects. (We are, of course, using the word defect to imply some dis continuity in the material, and not in any derogatory sense. ) This broadening of the field of interest led the Materials Advisory Board( I} to recommend a new definition for the discipline, "Materials Character ization," to encompass this wider concept of the determination of the structure and composition of materials. In characterizing a material, perhaps the most important special area of interest is the surface.
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1967 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book M ssbauer Effect Data Index written by and published by . This book was released on 1972 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Studies Using the Mossbauer Effect written by J. W. Burton and published by . This book was released on 1965 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mossbauer effect, because of its sensitivity to strength and angular distribution of binding, to magnetic and electric fields, and to the density of s electrons at the nucleus, is used to study crystal surfaces. The theory involved is sketched, the experimental approach is reviewed, and experimental results are discussed.
Download or read book Surface studies using the M ssbauer effect written by Joseph Anthony Morice and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1985 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1967-04 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book M ssbauer Effect Data Index written by John G. Stevens and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: That the field of Mossbauer spectroscopy continues for the remarks section of the index, and the inclusion to be an important growth area in science and tech of some new appendices and tables (such as the en nology, despite recent economic pressures, is ade ergy conversion tables, nuclear radius and moment quately evidenced by the present volume. Covering re data, and the report of the ASTM Task Group on search published only in the year 1969, its size is com Mossbauer Nomenclature and Conventions). The parable to its predecessor, Mossbauer Effect Data advertisement section, too, provides a collection of Index 1958-1965. With such continuing growth in information useful to many readers. many fields, the need for specialized information re In summary, the new editors are to be congratulated trieval tools for the research worker is now becoming for their excellent and tremendous effort in putting together such a fine compilation in a remarkably short an increasingly important internationally recognized time. The user community, I am sure, will strongly concern. MEDI 1969 satisfies much of this need for the community it addresses in a timely manner. urge them to continue this series, as I know their pred This work not only follows in the footsteps of its ecessor has been urged to help fill the gap for the years 1966-1968. predecessor, but also includes a number of important and very useful innovations. Among these are the classification of substances investigated according to ARTHUR H. MUIR, JR.
Download or read book M ssbauer Effect Methodology written by Irwin J. Gruverman and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the fifth volume of a series which provides acontinuing forum for publication of developments in Mossbauer effect methodology and of spectroscopy and its applications. Mossbauer Effect Methodology, Volume 5, records the proceedings of the Fifth Symposium on Mossbauer Effect Methodology. The sym posium was sponsored by the New England Nuclear Corporation and was centered on the themes of spectroscopy, new applications, and methodology. The symposium was held in the Mercury Ballroom of the New York Hilton hotel on February 2, 1969. Dr. P. A. Flinn of Carnegie Mellon Institute was chairman of the afternoon and evening sessions. About three hundred participants attended, and this degree of interest leads us to anticipate a sixth symposium early in 1970. Elron Electronic Industries and Reuter-Stokes Electronic Components Company demonstrated lines of equipment for Mossbauer investigators. The evident high quality of the commercial instrumenta tion available is a tribute to the growth of Mossbauer technology and to the manufacturers.
Download or read book M ssbauer Effect Data Index written by John Gehret Stevens and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: This year's issue is again exciting not only because People with common goals establish communities. Usually, in the natural sciences, communities originate it lists the 1 OOth excited resonance state, but also be around fields because institutions, conferences, and cause it contains extensive new information and addi 197 the literature are normally field oriented. In excep tional interesting articles on Au by Louis Roberts, 151 tional cases, communities have a method as the com Eu by Chris Barton and Norman Greenwood, and 129 mon bond, for instance, Mossbauer spectroscopy. The I by Hendrick deWaard. One innovation might be minimum requirement to be a "Mossbauer woman or suggested: for our irreproducible results we have the man" seems to be the possession of a Mossbauer sys International Journal of Irreproducible Results; how tem and the MEDI. Every member of the M6ssbauer ever, there is no literature for our reproducible nega community must have realized our extremely fortunate tive results. Sometimes nature's hidden tricks are un situation: before we put a drive system into motion known to us and experiments with some isotopes are we know within minutes if similar work has been pub tried unsuccessfully again and again. A chapter for lished somewhere in the world.
Download or read book Bibliography of North American Geology written by and published by . This book was released on 1967 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1949 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book M ssbauer Effect Methodology written by Irwin J. Gruverman and published by Springer Science & Business Media. This book was released on 2013-11-21 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mossbauer Effect Methodology, Volume 1, records the proceedings of the First Symposium on Mossbauer Effect Methodology. This Symposium was sponsored by the New England Nuclear Corporation and the Technical Measurement Corporation, and was devoted to principles, techniques, and applications of the Mossbauer effect. The Symposium was held at the Sheraton-Atlantic Hotel in New York City on january 26, 1965. Dr. Stanley Ruby, of Argonne National Laboratory, was Chairman of the aU-day session. About 250 people attended the Symposium, and interest appeared sufficient to warrant continuation of this Symposium series. It is hoped that future Symposia can be organized which will serve as a forum for presentation of advances in methodology. The papers presented in this volume review the current status of applications, describe instrument systems used, elu cidate measurement techniques applied, and formulate means of creating required environments for use in Mossbauer effect studies. With the proliferation of applications of the Mos sbauer effect in physics, as well as in chemistry and biology, the need for complete description of transducer systems, detection and data handling methods, and environment modification techniques be came apparent. The body of such experience, developed and possessed by a relatively small group of physicists, primarily, has not been readily accessible to those in other fields. The editor organized this Symposium in response to many expres sions of a need for such information.
Download or read book Abstracts of North American Geology written by Geological Survey (U.S.) and published by . This book was released on 1967-07 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
