Etude théorique de processus cohérents dans les alcalinos-terreux PDF Download
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Author: Martial Millet
Publisher:
ISBN:
Category :
Languages : en
Pages : 413
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Book Description
Theoretical investigations on the dynamics of coherent excitation and ionization processes in alkaline-earth atoms are reported. Atomic parameters required to the dynamical treatment are calculated with the R-matrix method in combination with the multichannel quantum defect theory (MQDT). We investigate the photoionization yields into three continuum channels of barium observed by Elliott et al in the study of coherent control through two-photon two-color interfering paths resonantly enhanced by an intermediate state. The dynamics studied by introducing an effective hamiltonian is described as an adiabatic process governed by the coherent excitation of the intermediate states. By using a time-dependent MQDT formalism valid in the weak field limit, we analyze the experiment on coherent control of energy and angular distribution of autoionized wave packets performed in calcium by van Leeuwen et al using isolated core excitation from a Rydberg state and optical Ramsey-like pump-probe technique. The dynamics of autoionization processes is investigated by studying the time dependence of radial electron flux created by one or two short pulses with a possible chirp and observed at fixed macroscopic distances from the atom. We develop a new formalism suitable to investigate autoionizing wave packets of narrow resonances created by short and intenses pulses. Resonances are explicitly introduced in the evolution equations. Their energies (positions and widths) in the complex plane, their couplings with continuum channels due to atomic interactions and their couplings with low-lying discrete states induced by the laser field are deduced from the MQDT formulation and are numerically calculated from the poles and the residues of the physical scattering matrix S and of the light shift operator. The relation between these poles and the Siegert states is presented and identification of the resonances is deduced from the corresponding wave functions.
Author: Martial Millet
Publisher:
ISBN:
Category :
Languages : en
Pages : 413
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Book Description
Theoretical investigations on the dynamics of coherent excitation and ionization processes in alkaline-earth atoms are reported. Atomic parameters required to the dynamical treatment are calculated with the R-matrix method in combination with the multichannel quantum defect theory (MQDT). We investigate the photoionization yields into three continuum channels of barium observed by Elliott et al in the study of coherent control through two-photon two-color interfering paths resonantly enhanced by an intermediate state. The dynamics studied by introducing an effective hamiltonian is described as an adiabatic process governed by the coherent excitation of the intermediate states. By using a time-dependent MQDT formalism valid in the weak field limit, we analyze the experiment on coherent control of energy and angular distribution of autoionized wave packets performed in calcium by van Leeuwen et al using isolated core excitation from a Rydberg state and optical Ramsey-like pump-probe technique. The dynamics of autoionization processes is investigated by studying the time dependence of radial electron flux created by one or two short pulses with a possible chirp and observed at fixed macroscopic distances from the atom. We develop a new formalism suitable to investigate autoionizing wave packets of narrow resonances created by short and intenses pulses. Resonances are explicitly introduced in the evolution equations. Their energies (positions and widths) in the complex plane, their couplings with continuum channels due to atomic interactions and their couplings with low-lying discrete states induced by the laser field are deduced from the MQDT formulation and are numerically calculated from the poles and the residues of the physical scattering matrix S and of the light shift operator. The relation between these poles and the Siegert states is presented and identification of the resonances is deduced from the corresponding wave functions.
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: S. Feneuille
Publisher:
ISBN:
Category : Atomic spectra
Languages : en
Pages : 368
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Book Description
Author: International Atomic Energy Agency
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 68
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Book Description
Author: Jonathan Simon
Publisher: World Scientific
ISBN: 1908977620
Category : Science
Languages : en
Pages : 295
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Book Description
What do you associate with chemistry? Explosions, innovative materials, plastics, pollution? The public's confused and contradictory conception of chemistry as basic science, industrial producer and polluter contributes to what we present in this book as chemistry's image as an impure science. Historically, chemistry has always been viewed as impure both in terms of its academic status and its role in transforming modern society. While exploring the history of this science we argue for a characteristic philosophical approach that distinguishes chemistry from physics. This reflection leads us to a philosophical stance that we characterise as operational realism. In this new expanded edition we delve deeper into the questions of properties and potentials that are so important for this philosophy that is based on the manipulation of matter rather than the construction of theories./a
Author: Eric R. Scerri
Publisher: World Scientific
ISBN: 1848161379
Category : Science
Languages : en
Pages : 248
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Book Description
This book represents a collection of papers from one of the founders of the new Philosophy of Chemistry. It is only the second single-author collection of papers on the Philosophy of Chemistry.The author is the editor-in-chief of Foundations of Chemistry, the leading journal in the field. He has recently gained worldwide success with his book on the periodic table of the elements titled The Periodic Table: Its Story and Its Significance. This volume provides an in-depth examination of his more philosophical and historical work in this area and further afield.
Author: H.P. Myers
Publisher: CRC Press
ISBN: 1000707628
Category : Science
Languages : en
Pages : 591
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Book Description
Assuming an elementary knowledge of quantum and statistical physics, this book provides a comprehensive guide to principal physical properties of condensed matter, as well as the underlying theory necessary for a proper understanding of their origins. The subject matter covers the principal features of condensed matter physics, but with particular accent on the properties of metal alloys. Relevance to technical applications is recognized.
Author: Malcolm D Bolton
Publisher: Universities Press
ISBN: 9788173714252
Category : Soil mechanics
Languages : en
Pages : 464
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Book Description
Covers all the soil mechanics and foundation engineering topics that are commonly included in civil engineering degree courses, and provides a number of springboards into related advanced topics. Although it is intended principally to satisfy the needs of student civil engineers, this guide should also prove useful to those practicing engineers who are unaware of the powerful and elegant reconstruction of the subject which has been made possible by the recent concepts of plasticity, dilatancy and critical states.
Author: Mason Willrich
Publisher:
ISBN:
Category : Social Science
Languages : en
Pages : 150
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Book Description
Discusses the nature of post-fission radioactive waste, the operations that spent fuel goes through after it is discharged from a reactor, and the problem of waste management.
Author: Terry W. Sturm
Publisher: DIANE Publishing
ISBN: 1428995048
Category : Bridges
Languages : en
Pages : 147
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Book Description
Experimental results and analyses are given in this report on bridge abutment scour in compound channels. Experiments were conducted in a laboratory flume with a cross section consisting of a wide floodplain adjacent to a main channel. The embankment length, discharge, sediment size, and abutment shape were varied, and the resulting equilibrium scour depths were measured. Water-surface profiles, velocities, and scour-hole contours were also measured. In the report, a methodology is developed for estimating abutment scour that takes into account the redistribution of discharge in the bridge contraction, abutment shape, sediment size, and tailwater depth. The independant variables in the proposed scour formula are evaluated at the approach-channel cross section and can be obtained froma one-dimensional water-surface profile computer program such as the Water-Surface Profile Program (WSPRO). The proposed scour evaluation procedure is outlined and illustrated, including consideration of the time required to reach equilibrium scour. The proposed methodology is applied to two cases of measured scour in the field.
