Atomic Spectra and the Vector Model


Book Description

Originally published in 1937, this book is the first of two volumes discussing the spectra of the various atomic elements. Volume One addresses series spectra, as well as the Stark effect and Moseley's Law. This book will be of value to anyone with an interest in the history of science.







Atomic Spectra and the Vector Model


Book Description

Introduction -- The hydrogen atom -- The alkali doublets -- The alkaline earths -- Absorption spectra -- The Zeeman effect -- Paschen-Back effect -- The periodic system -- The doublet laws -- Displaced terms -- Combination of several electrons -- Elements of the short periods -- Long periods -- The lanthanides -- The actinides -- Line intensities -- The sum rules and (jj) coupling -- Series limit -- Hyperfine structure -- Quadrupole radiation.




Atomic Spectra and Atomic Structure


Book Description

For beginners and specialists in other fields: the Nobel Laureate's introduction to atomic spectra and their relationship to atomic structures, stressing basics in a physical, rather than mathematical, treatment. 80 illustrations.




Introduction to the Theory of Atomic Spectra


Book Description

Introduction to the Theory of Atomic Spectra is a systematic presentation of the theory of atomic spectra based on the modern system of the theory of angular momentum. Many questions which are of interest from the point of view of using spectroscopic methods for investigating various physical phenomena, including continuous spectrum radiation, excitation of atoms, and spectral line broadening, are discussed. This volume consists of 11 chapters organized into three sections. After a summary of elementary information on atomic spectra, including the hydrogen spectrum and the spectra of multi-electron atoms, the reader is methodically introduced to angular momentum, systematics of the levels of multi-electron atoms, and hyperfine structure of spectral lines. Relativistic corrections are also given consideration, with particular reference to the use of the Dirac equation to determine the stationary states of an electron in an arbitrary electromagnetic field. In addition, the book explores the Stark effect and the Zeeman effect, the interaction between atoms and an electromagnetic field, and broadening of spectral lines. The final chapter is devoted to the problem of atomic excitation by collisions. This book is intended for advanced-course university students, postgraduate students and scientists working on spectroscopy and spectral analysis, and also in the field of theoretical physics.




ATOMIC AND MOLECULAR SPECTRA (QUANTUM MECHANICS)


Book Description

No.-I Matter Waves : Inadequacies of classical mechanics, Photoelectric phenomenon, Compton effect, wave particle duality, de-Broglie matter waves and their experimental verification, Heisenberg’s uncertainty principle, Complementary principle, Principle of superposition, Motion of wave packets. No.-II Schrodinger Equation and its Applications : Schrodinger wave equation, Interpretation of wave function, Expectation values of dynamical variables, Ehrenfest theorem, Orthonormal properties of wave functions, One dimensional motion in step potential, Rectangular barrier, Square well potential, Particle in a box, normalization, Simple Harmonic Oscillator. No.-III Atomic Spectra : Spectra of hydrogen, deuteron and alkali atoms, spectral terms, doublet fine structure, screening constants for alkali spectra for s, p, d, and f states, selection rules. Singlet and triplet fine structure in alkaline earth spectra, L-S and J-J couplings. Weak spectra: continuous X-ray spectrum and its dependence on voltage, Duane and Haunt’s law. Characteristics X-rays, Moseley’s law, doublet structure and screening parameters in X-ray spectra, X-ray absorption spectra. No.-IV Molecular Spectra : Discrete set of electronic energies of molecules, quantisation of vibrational and rotational energies, determination of internuclear distance, pure rotation and rotation- vibration spectra, Dissociation limit for the ground and other electronic states, transition rules for pure vibration and electronic vibration spectra.




Spectra of Atoms and Molecules


Book Description

1. Introduction. 1.1. Waves, Particles, and Units. 1.2. The Electromagnetic Spectrum. 1.3. Interaction of Radiation with Matter. 1.3a. Blackbody Radiation. 1.3b. Einstein A and B Coefficients. 1.3c. Absorption and Emission of Radiation. 1.3d. Beer's Law. 1.3e. Lineshape Functions. 1.3f. Natural Lifetime Broadening. 1.3g. Pressure Broadening. 1.3h. Doppler Broadening. 1.3i. Transit-Time Broadening. 1.3j. Power Broadening. 2. Molecular Symmetry. 2.1. Symmetry Operations. 2.1a. Operator Algebra. 2.1b. Symmetry Operator Algebra. 2.2. Groups. 2.2a. Point Groups. 2.2b. Classes. 2.2c. Subgroups. 2.3.




ATOM, LASER AND SPECTROSCOPY


Book Description

Experimental spectroscopic techniques, especially those involving lasers, have wide-ranging applications in the fields of physics, medicine, electronics, and chemistry. Keeping in mind the importance of spectroscopic detection and characterization of atomic and molecular species, this book, now in its Second Edition, is updated. It deals with both the conventional and modern experimental techniques related to atoms, spectroscopy and lasers. It discusses the recent innovations, types and operating principles of lasers and laser systems. A section on Fiber Laser has been added in the new edition of the book. Recent developments in planetary detection of atoms and molecules by Laser Induced Breakdown Spectroscopy (LIBS) has prompted the inclusion of a section on LIBS on planet Mars along with its applications. Primarily intended as a text for undergraduate and postgraduate students of Physics in various Indian universities, this uptodate book would be immensely useful also for both undergraduate and postgraduate students in Chemistry, Astrophysics, Metallurgy and Material Science, and Geology and Mining. Key Features Coverage is quite extensive to cater to students of most Indian universities—with detailed discussions on atoms, spectroscopy and lasers. Gives special emphasis on modern aspects of spectroscopy such as laser cooling of atoms. Contains more than 140 diagrams to illustrate the concepts better.







Structure of Multielectron Atoms


Book Description

This book is about the structure of multielectron atoms and predominantly adopts a perturbative approach to the total Hamiltonian. A key concept is the central-field approximation and, beyond the standard LS-coupling and jj-coupling schemes, intermediate cases are also treated. After that, the book covers hyperfine structure and other nuclear effects, as well as interactions with static external fields. Throughout the book, an analytical approach is adopted. Working knowledge of basic quantum mechanics (including the non-relativistic hydrogen atom, basic angular momentum and perturbation theory) is assumed, and it begins with a brief recap of the hydrogen orbitals, before turning towards the symmetry aspects of multi-electron atoms, spin-orbit interaction and couplings of angular momenta.