Keywords: (click the terms to watch YouTube videos)
Quantum Chemistry: The application of quantum mechanics to solve chemical problems. It influences all branches of chemistry, helping calculate thermodynamic properties, interpret molecular spectra, understand intermolecular forces, and more
Classical Mechanics: The laws of motion of macroscopic objects discovered by Isaac Newton in the late seventeenth century. It does not correctly describe the behavior of very small particles such as electrons and nuclei
Quantum Mechanics: A set of laws that describe the behavior of very small particles like electrons and nuclei. It was developed in the early twentieth century
Wave-Particle Duality: The concept that electrons and other microscopic particles exhibit both wave-like and particle-like properties. This duality is fundamental to understanding quantum mechanics
Uncertainty Principle: Werner Heisenberg's principle stating that it is impossible to simultaneously know the exact position and momentum of a particle. This principle imposes a limit on the precision of measurements at the microscopic level
Schrödinger Equation: An equation that describes how the wave function of a quantum system evolves over time. The time-dependent Schrödinger Equation is used for systems with constant energy and is simpler to apply in many chemical problems
Wave Function: A function that provides information about the probability of finding a particle in a particular region of space. The probability density is given by the square of the absolute value of the wave function
Probability Density: The square of the absolute value of the wave function, which gives the probability of finding a particle at various places on the x-axis
Complex Numbers: Numbers that have both a real part and an imaginary part. They are essential for understanding and solving the Schrödinger Equation
Diffraction: The bending of a wave around an obstacle. It is observed when light goes through two adjacent pinholes
Interference: The combining of two waves of the same frequency to give a wave whose disturbance at each point in space is the algebraic or vector sum of the disturbances at that point resulting from each interfering wave
Electromagnetic Waves: Waves consisting of oscillating electric and magnetic fields. Light is an electromagnetic wave
Blackbody Radiation: The radiation emitted by a heated blackbody, an object that absorbs all light falling on it
Energy Quantization: The concept that the energy of a resonator is restricted to be a whole-number multiple of a certain value. This concept was introduced by Max Planck
Photoelectric Effect: The emission of electrons from a metal when light shines on it. The energy of the emitted electrons depends on the frequency of the light
Photons: Particle-like entities that make up light. Each photon has an energy proportional to its frequency
Atomic Structure: Atoms are composed of electrons, protons, and neutrons. The positive charge is concentrated in a tiny, heavy nucleus
Bohr Model: Niels Bohr's model of the atom in which electrons revolve around the nucleus in quantized orbits
de Broglie Wavelength: The wavelength associated with a particle, given by the equation λ = h/p, where h is Planck's constant and p is the momentum
Stationary States: States of constant energy in quantum mechanics. The probability density does not change with time in these states
Normalization: The requirement that the integral of the probability density over all space is equal to one
Probability: The likelihood of an event occurring. In quantum mechanics, it is used to predict the probabilities of various possible results
Complex Conjugate: The complex conjugate of a complex number is obtained by replacing i with -i
Absolute Value: The distance of a complex number from the origin in the complex plane
Phase: The angle that the radius vector to the point representing a complex number makes with the positive horizontal axis
SI Units: The International System of Units, which includes the meter (m), kilogram (kg), and second (s) as units of length, mass, and time
Calculus: A branch of mathematics heavily used in quantum chemistry. It includes differentiation and integration