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On the Shoulders of Giants”
On the Shoulders of Giants”

Quantum Mechanics and Atomic Physics
Quantum Mechanics and Atomic Physics

... If n ≠ kk, but En= Ek, then we say that the eigenfunctions are degenerate Since En-Ek = 0, 0 the integral need not be zero But it turns out that we can always obtain another set of Ψ’s, linear combinations of the originals, such that the new Ψ’s are orthogonal. ...
Time dependence in quantum mechanics
Time dependence in quantum mechanics

Lecture 3
Lecture 3

Fine Structure 35.1 Relativistic Hamiltonian
Fine Structure 35.1 Relativistic Hamiltonian

Hamiltonian Equations
Hamiltonian Equations

Electrons in graphene - Condensed Matter Physics
Electrons in graphene - Condensed Matter Physics

10.4: Helium Atom - PhysWiki
10.4: Helium Atom - PhysWiki

The Quantum Harmonic Oscillator
The Quantum Harmonic Oscillator

The Interaction of Radiation and Matter: Semiclassical Theory (cont
The Interaction of Radiation and Matter: Semiclassical Theory (cont

The Hydrogen Atom - Physics
The Hydrogen Atom - Physics

... Remark: Schrödinger began his quest for a theory of atomic physics with Maxwell’s Equations, in particular, the eikonal form of these equations. It is no surprise that his theory inherits key characteristics of electromagnetic theory: solutions that are amplitudes, the superposition principle for ...
Quantum Mechanics in 3
Quantum Mechanics in 3

A Simply Regularized Derivation of the Casimir Force
A Simply Regularized Derivation of the Casimir Force

Optical potential in electron
Optical potential in electron

... Thus the first order optical potential provides the static (and exchange) potential generated by nuclei and fixed bound state wave function of the molecule: ...
Problem Set 1
Problem Set 1

CHEMISTRY 120A FALL 2006
CHEMISTRY 120A FALL 2006

... ultra-violet regions of the spectrum), and then various laser-based pump-probe techniques for studying photo-dissociation and photo-chemistry in general. Quantum mechanical perturbation theory will be applied to Nuclear Magnetic Resonance (NMR) spectroscopy, showing how the characteristic multiplet ...
CHEMISTRY 120A FALL 2006 Lectures: MWF 10
CHEMISTRY 120A FALL 2006 Lectures: MWF 10

Time independent Schrödinger Equation
Time independent Schrödinger Equation

The relaxation-time von Neumann-Poisson equation
The relaxation-time von Neumann-Poisson equation

... This paper is concerned with the relaxation-time von Neumann-Poisson (or quantum Liouville-Poisson) equation in three spatial dimensions which describes the self-consistent time evolution of an open quantum mechanical system that include some relaxation mechanism. This model and the equivalent relax ...
Response Theory for Linear and Non-Linear X
Response Theory for Linear and Non-Linear X

Jaynes-Cummings model
Jaynes-Cummings model

... 1 ³ |Ψi = √ |ei|ni + |gi|n + 1i . ...
Non-Hermitian Rayleigh-Schrödinger Perturbation Theory
Non-Hermitian Rayleigh-Schrödinger Perturbation Theory

... ing [22, 23, 24, 25], or the use of a complex absorbing potential (CAP) [26, 27, 28]. In the latter two approaches, the Siegert energy of a resonance is found as a discrete eigenvalue of a modified, non-Hermitian Schrödinger equation. The effective Siegert wave function in this eigenvalue problem i ...
Exam #: Printed Name: Signature: PHYSICS DEPARTMENT
Exam #: Printed Name: Signature: PHYSICS DEPARTMENT

Computational Quantum Chemistry
Computational Quantum Chemistry

Atomic Term Symbols
Atomic Term Symbols

... respectively, 9 states in total. A 2 D level (S=1/2, L=2), splits into J=5/2 (6 states) and J=3/2 (4 states), hence 10 states in total. The atomic term values are 2 D5/ 2 , 2 D3/ 2 . You may notice that the splittings discussed for the hydrogen atom follow this rule also. The energy splittings betwe ...
< 1 ... 44 45 46 47 48 49 50 51 52 ... 59 >

Perturbation theory (quantum mechanics)

In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional ""perturbing"" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can be expressed as ""corrections"" to those of the simple system. These corrections, being small compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. The complicated system can therefore be studied based on knowledge of the simpler one.
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