[PDF] Core Level Photoelectron Spectroscopy Of Small Molecules eBook

Author : Juan A Colón Santana
Publisher : Morgan & Claypool Publishers
Page : 151 pages
File Size : 37,69 MB
Release : 2016-01-01
Category : Technology & Engineering
ISBN : 1627053077

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Photoemission (also known as photoelectron) spectroscopy refers to the process in which an electron is removed from a specimen after the atomic absorption of a photon. The first evidence of this phenomenon dates back to 1887 but it was not until 1905 that Einstein offered an explanation of this effect, which is now referred to as ""the photoelectric effect"". Quantitative Core Level Photoelectron Spectroscopy: A Primer tackles the pragmatic aspects of the photoemission process with the aim of introducing the reader to the concepts and instrumentation that emerge from an experimental approach. The basic elements implemented for the technique are discussed and the geometry of the instrumentation is explained. The book covers each of the features that have been observed in the X-ray photoemission spectra and provides the tools necessary for their understanding and correct identification. Charging effects are covered in the penultimate chapter with the final chapter bringing closure to the basic uses of the X-ray photoemission process, as well as guiding the reader through some of the most popular applications used in current research.

Author : Stephan Hüfner
Publisher : Springer Science & Business Media
Page : 671 pages
File Size : 45,2 MB
Release : 2013-03-09
Category : Science
ISBN : 3662092808

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The author, S. Hüfner, presents an authoritative and up-to-date introduction to the field by comprehensively treating the electronic structures of atoms, molecules, solids, and surfaces. Brief descriptions are given of inverse photoemission, spin-polarized photoemission and photoelectron diffraction. Experimental aspects are considered throughout the third edition book and the results are carefully interpreted in terms of the theory. A wealth of measured data is presented in tabulator form for easy use by experimentalists. The reader will learn about the basic technique of photoemission spectroscopy and obtain the necessary background for work based on this book.

Author : Stefan Hüfner
Publisher : Springer Science & Business Media
Page : 530 pages
File Size : 48,92 MB
Release : 2013-06-29
Category : Technology & Engineering
ISBN : 3662032090

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Photoelectron Spectroscopy presents an up-to-date introduction to the field by comprehensively treating the electronic structures of atoms, molecules, solids, and surfaces. Brief descriptions are given of inverse photoemission, spin-polarized photoemission and photoelectron diffraction. Experimental aspects are considered throughout the book and the results are carefully interpreted in terms of the theory. A wealth of measured data is presented in tabulator form for easy use by experimentalists.

Author : Kenneth D. Bomben
Publisher :
Page : 290 pages
File Size : 45,40 MB
Release : 1980
Category : Molecular spectra
ISBN :

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The photoelectron spectra of a series of halogenated molecules have been investigated in the gas phase. Both core-ionization energies and Auger kinetic energies were measured to probe the nature of the interaction that holds a core electron to the molecule. It was found that satellite structure (shake) could be used to predict the amplitude attenuation in the Br2 EXAFS spectrum. Inclusion of multielectron processes into the theory that predicts the EXAFS amplitude provides a more accurate representation of the EXAFS spectrum if certain assumptions about the threshold of shake are valid. The satellites can be used to investigate the nature of the transitions themselves. In the case of argon, the transitions arise from Rydberg processes that excite a 3p valence electron to the 4p or 5p. In addition, the shake structure allows a measurement of the relaxation energy. The difference between the average energy of a spectrum, including shake, and the energy of the main peak in that spectrum is equal to the difference between the Koopmans' theorem "frozen orbital" state and the fully relaxed state. This is the total relaxation. Difference spectra can then be used to get at the extra-atomic relaxation. Comparison with the values of extra-atomic relaxation arrived at via other methods shows that this method yields comparable results. Investigation of the extra-atomic relaxation energy by means of the Auger parameter was found to yield information on the nature of electronegativity. Quantitative and qualitative comparisons of the relative values of extra-atomic relaxation as well as of initial-state effects (chemical shifts) lead to conclusions that are in excellent accord with chemical experience. The correlation between core-ionization potentials and gas-phase acidities breaks down for certain compounds. It was found that the failure arises from the inability of certain aromatic compounds to undergo the same geometric rearrangent upon protonation as their aliphatic analogs. Other experiments into the nature of the dipole of C1F have indicated that, contrary to chemical intuititon and theoretical evidence, the negative end of the dipole may be on the chlorine atom. An investigation of the charge distribution, corrected for relaxation effects, shows that this conclusion is not supported and that the more recent experimental results are correct. An attempt was made to measure the difference between the core-ionization energy of a diatomic molecule and a monatomic dissociation product. While difficulties in experimental procedure made it impossible to measure the core-ionization energy of the atom, an estimate of the magnitude of the relative extra-atomic energy was made.

Author : Joseph Berkowitz
Publisher : Academic Press
Page : 533 pages
File Size : 17,10 MB
Release : 2015-03-27
Category : Science
ISBN : 0128019581

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Atomic and Molecular Photoabsorption: Partial Cross Sections is a companion work to Joseph Berkowitz's earlier work, Atomic and Molecular Photoabsorption: Absolute Total Cross Sections, published with Academic Press in 2002. In this work Joseph Berkowitz selected the "best" absolute partial cross sections for the same species as included in the companion work. A contrast, however, is that photoabsorption measurements, being of order I/Io, do not require the most intense light sources, whereas acquiring data on the products of light interactions with gaseous matter (ions, electrons, various coincidence measurements) has benefited significantly with the arrival of second- and third-generation synchrotrons. The newer devices have also extended the energy range of the light sources to include the K-shells of the species discussed here. The newer light sources encouraged experimentalists to develop improved instrumentation. Thus, the determination of partial cross sections continues to be an active field, with more recent results in some cases superseding earlier ones. Where the accuracy of the absolute partial cross sections is deemed sufficient (less than five percent), numerical tables are included in this new work. In other cases, the available data are presented graphically. Includes data on atoms, diatomic molecules, triatomic molecules, and polyatomic molecules Written by world-leading pioneer in the field of photoionization mass spectrometry Very clear presentation of the useful, quantitative information in both tables and graphs

Author : Juan A Colón Santana
Publisher : Morgan & Claypool Publishers
Page : 109 pages
File Size : 26,38 MB
Release : 2016-01-01
Category : Technology & Engineering
ISBN : 1627053069

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Photoemission (also known as photoelectron) spectroscopy refers to the process in which an electron is removed from a specimen after the atomic absorption of a photon. The first evidence of this phenomenon dates back to 1887 but it was not until 1905 that Einstein offered an explanation of this effect, which is now referred to as ""the photoelectric effect"". Quantitative Core Level Photoelectron Spectroscopy: A Primer tackles the pragmatic aspects of the photoemission process with the aim of introducing the reader to the concepts and instrumentation that emerge from an experimental approach. The basic elements implemented for the technique are discussed and the geometry of the instrumentation is explained. The book covers each of the features that have been observed in the X-ray photoemission spectra and provides the tools necessary for their understanding and correct identification. Charging effects are covered in the penultimate chapter with the final chapter bringing closure to the basic uses of the X-ray photoemission process, as well as guiding the reader through some of the most popular applications used in current research.