Theoretical Chemistry
Jack Simons
University of Utah
Salt Lake City, Utah
Table of Contents
Chapter 1 (79 pages) The Basics of Quantum Mechanics
Why Quantum Mechanics is Necessary for Describing Molecular Properties
I. The Schrödinger Equation and Its Components
A. Operators
B. Wave functions
C. The Schrödinger Equation
1. The Time-Dependent Equation
2. The Time-Independent Equation
3. The Born-Oppenheimer Approximation
II. Your first application of quantum mechanics- motion of a particle in one dimension.
A. The Classical Probability Density
B. The Quantum Treatment
C. The Energies and Wavefunctions
D. The Probability Densities
E. Classical and Quantum Probability Densities
F. Time Propagation of Wavefunctions
III. Free Particle Motions in More Dimensions
A. The Schrödinger Equation
B. Boundary Conditions
C. Energies and Wave functions for Bound States
D. Quantized Action Can Also be Used to Derive Energy Levels
E. Quantized Action Does Not Always Work
Chapter 2 (117 pages) Model Problems That Form Important Starting Points
I. Free Electron Model of Polyenes
II. Bands of Orbitals in Solids
III. Densities of States in 1, 2, and 3 dimensions.
IV. The Most Elementary Model of Orbital Energy Splittings: Hückel
or Tight-Binding Theory
V. Hydrogenic Orbitals
VI. Electron Tunneling
VII. Angular Momentum
VIII. Rotations of Molecules
1. Rotational Motion For Rigid Diatomic and Linear Polyatomic Molecules
2. Rotational Motions of Rigid Non-Linear Molecules
IX. Vibrations of Molecules
Chapter 3 (20 pages) Characteristics of Energy Surfaces
I. Strategies for Geometry Optimization
II. Normal Modes of Vibration
A. The Newton Equations of Motion for Vibration
1. The Kinetic and Potential Energy Matrices
2. The Harmonic Vibrational Energies and Normal Mode Eigenvectors
B. The Use of Symmetry
1. Symmetry Adapted Modes
2. Point Group Symmetry of the Harmonic Potential
Chapter 4 (59 pages) Some Important Tools of Theory
I. Perturbation Theory and the Variational Method
II. Point Group Symmetry
Character Tables
Part 2. Three Primary Areas of Theoretical Chemistry
Chapter 5 (73 pgs) An Overview of Theoretical Chemistry
I. What is Theoretical Chemistry About?
A. Molecular Structure- bonding, shapes, electronic structures
B. Molecular Change- reactions, isomerization, interactions
1. Changes in Bonding
2. Energy Conservation
3. Conservation of Orbital Symmetry: Woodward-Hoffmann Rules
4. Rates of change
C. Statistical Mechanics: Treating Large Numbers of Molecules in Close Contact
II. Molecular Structure: Theory and Experiment
A. Experimental Probes of Molecular Shapes
1. Rotational Spectroscopy
2. Vibrational Spectroscopy
3. X-Ray Crystallography
4. NMR Spectroscopy
B. Theoretical Simulation of Structures
III. Chemical Change
A. Experimental Probes of Chemical Change
B. Theoretical Simulation of Chemical Change
Chapter 6 (134 pgs) Electronic Structures
I. Theoretical Treatment of Electronic Structure: Atomic and Molecular Orbital Theory
A. Orbitals
1. The Hartree Description
2. The LCAO-Expansion
3. AO Basis Sets
a. STOs and GTOs
b. The Fundamental Core and Valence Basis
c. Polarization Functions
d. Diffuse Functions
4. The Hartree-Fock Approximation
a. Koopmans' Theorem
b. Orbital Energies and the Total Energy
5. Molecular Orbitals
a. Shapes, Sizes, and Energies of Orbitals
b. Bonding, Anti-bonding, Non-bonding, and Rydberg Orbitals
B. Deficiencies in the Single Determinant Model
1. Electron Correlation
2. Essential Configuration Interaction
3. Various Approaches to Electron Correlation
a. The CI Method
b. Perturbation Theory
c. The Coupled-Cluster Method
d. The Density Functional Method
e. Energy Difference Methods
f. The Slater-Condon Rules
g. Atomic Units
C. Molecules Embedded in Condensed Media
D. High-End Methods for Treating Electron Correlation
II. Experimental Probes of Electronic Structure
A. Visible and Ultraviolet Spectroscopy
1. The Electronic Transition Dipole and Use of Point Group Symmetry
2. The Franck-Condon Factors
3. Time Correlation Function Expressions for Transition Rates
4. Line Broadening Mechanisms
B. Photoelectron Spectroscopy
C. Probing Continuum Orbitals
Chapter 7 (79 pgs) Statistical Mechanics
I. Collections of Molecules at or Near Equilibrium
A. The Distribution of Energy Among Levels
B. Partition Functions and Thermodynamic Properties
C. Equilibrium Constants in Terms of Partition Functions
D. Monte-Carlo Evaluation of Properties
E. Molecular Dynamics Simulations of Properties
II. Time Correlation Functions
III. Some Important Chemical Applications of Statistical Mechanics
A. Gas-Molecule Thermodynamics
B. Einstein and Debye Models of Solids
C. Lattice Theories of Surfaces and Liquids
D. Virial Corrections to Ideal-Gas Behavior
Chapter 8 (50 pgs) Chemical Dynamics
I. Theoretical Treatment of Chemical Change and Dynamics
A. Transition State Theory
B. Variational Transition State Theory
C. Reaction Path HamiltonianTheory
D. Classical Dynamics Simulation of Rates
E. RRKM Theory
F. Correlation Function Expressions for Rates
G. Wave Packet Propagation
H. Surface Hopping Dynamics
II. Experimental Probes of Reaction Dynamics
A. Spectroscopic Methods
B. Beam Methods
C. Other Methods
Problems (64 pgs)
Solutions (159 pgs)