• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Chemical Terms and Keywords
Chemical Terms and Keywords

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI M.Sc. SECOND
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI M.Sc. SECOND

Atomic Orbitals - Daytona State College
Atomic Orbitals - Daytona State College

Exact reduced dynamics and
Exact reduced dynamics and

3. Electronic structure of atoms
3. Electronic structure of atoms

Neutron Scattering Theory - Oklahoma State University
Neutron Scattering Theory - Oklahoma State University

REVIEW OF WAVE MECHANICS
REVIEW OF WAVE MECHANICS

... You may be aware of the special role eigenvalue equations play in quantum mechanics. Many of the important equations you have seen have been in the form of Q  n  q n n , where Q is an operator (e.g. the Hamiltonian on the left hand side of Schrodinger’s equations), and qn and n respectively ar ...
homework 2, due October 3rd
homework 2, due October 3rd

Formulae, Equations Homework
Formulae, Equations Homework

... into word equations: a) When hydrogen sulphide is burned in oxygen the poisonous gas sulphur dioxide is produced as well as water. b) Iron can be made by heating iron oxide with carbon monoxide in a blast furnace. Carbon dioxide gas is also produced . ...
Quiz
Quiz

Analysis of the projected Coupled Cluster Method in Electronic
Analysis of the projected Coupled Cluster Method in Electronic

Quantum Mechanics
Quantum Mechanics

AP Ch3 Empirical Formulas (1314 Revised)
AP Ch3 Empirical Formulas (1314 Revised)

Topics on Chapter 10 Test: The Mole
Topics on Chapter 10 Test: The Mole

MASSACHUSETTS INSTITUTE OF TECHNOLOGY
MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Planck`s Law and Light Quantum Hypothesis.
Planck`s Law and Light Quantum Hypothesis.

another Exam2
another Exam2

... Suppose that the first excited state 1 , with wavefunction ! 1 ( x ) = x 1 and energy E1 , is known to be orthogonal to the ground state 0 : 1 0 = 0 . Then let a trial state ! , with wavefunction ! ( x ) = x ! , be some approximation to 1 which is chosen to be orthogonal to 0 : ...
Easy Spin-Symmetry-Adaptation. Exploiting the Clifford
Easy Spin-Symmetry-Adaptation. Exploiting the Clifford

optical transitions and excitonic coupling in a covalently linked
optical transitions and excitonic coupling in a covalently linked

... dansyl moiety. Experimentally, a broad fluorescence band with a maximum at 511 nm has been observed [1] which could in principle result as emission from either one of the chromophores or even from both (dual fluorescence). In order to unravel the mechanisms behind the luminescence, we calculate abso ...
CH-103 Tutorial-1
CH-103 Tutorial-1

... 3. If the position of speck of dust mass 1 micro gram is known within 10-3 mm, what is the indeterminacy in its momentum and velocity? 4. If an electron in a hydrogen atom is confined to a region of size 53 picometer (pm) from the nucleus, what is the indeterminacy in its momentum and velocity? 5. C ...
Variational principle - Indiana University Bloomington
Variational principle - Indiana University Bloomington

... 1. We have so far dealt with particle in a box, hydrogen atom and harmonic oscillator. These were problems that can be solved analytically. However, all other chemical problems (with more than one electron) are problems that cannot be solved exactly and approximate methods are necessary to treat suc ...
STUDY SHEET EXAM 2
STUDY SHEET EXAM 2

Contents_new - Henry Eyring Center for Theoretical Chemistry
Contents_new - Henry Eyring Center for Theoretical Chemistry

... Session 2: Hartree-Fock: atomic units; electron-nuclear and electron-electron cusps, antisymmetry; Coulomb holes, mean –field potential, Slater determinants, spin-orbitals, spin functions, Slater-Condon rules, The HF equations, Coulomb and exchange, Koopmans’ theorem, orbital energies, problems aris ...
H - unix.eng.ua.edu
H - unix.eng.ua.edu

... 2. Sij = dij (orthonormal basis set) 3. Hii = a (negative of the ionization potential of the methyl radical) 4. Hij = b (negative stabilization energy). 90º rotation removes all bonding, thus we can calculate DE: DE = 2Ep - Ep where Ep = a and Ep = 2a + 2b (as shown below) ...
Document
Document

< 1 ... 59 60 61 62 63 64 65 66 67 >

Coupled cluster

Coupled cluster (CC) is a numerical technique used for describing many-body systems. Its most common use is as one of several post-Hartree–Fock ab initio quantum chemistry methods in the field of computational chemistry. It essentially takes the basic Hartree–Fock molecular orbital method and constructs multi-electron wavefunctions using the exponential cluster operator to account for electron correlation. Some of the most accurate calculations for small to medium-sized molecules use this method.The method was initially developed by Fritz Coester and Hermann Kümmel in the 1950s for studying nuclear physics phenomena, but became more frequently used when in 1966 Jiři Čížek (and later together with Josef Paldus) reformulated the method for electron correlation in atoms and molecules. It is now one of the most prevalent methods in quantum chemistry that includes electronic correlation.CC theory is simply the perturbative variant of the Many Electron Theory (MET) of Oktay Sinanoğlu, which is the exact (and variational) solution of the many electron problem, so it was also called ""Coupled Pair MET (CPMET)"". J. Čížek used the correlation function of MET and used Goldstone type perturbation theory to get the energy expression while original MET was completely variational. Čížek first developed the Linear-CPMET and then generalized it to full CPMET in the same paper in 1966. He then also performed an application of it on benzene molecule with O. Sinanoğlu in the same year. Because MET is somewhat difficult to perform computationally, CC is simpler and thus, in today's computational chemistry, CC is the best variant of MET and gives highly accurate results in comparison to experiments.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report