Quantum Mechanics Wave Functions

Quantum mechanics wave functions are mathematical descriptions of the quantum state of a particle or system, providing the foundation for predicting measurable behavior in chemistry and physics. A wave function evolves according to the Schrödinger equation, and its squared magnitude gives the probability density for finding a particle in a particular position, energy state, or configuration. In chemistry, solutions for electrons in atoms and molecules produce orbitals, energy levels, and electron distributions that explain atomic structure, chemical bonding, molecular geometry, and spectroscopy. Understanding wave functions also supports computational chemistry, where quantum models predict molecular properties and guide the design of new materials and medicines.

Quantum Mechanics Wave Functions - Related Videos

Education

JoVE Core - Chemistry

The Quantum-Mechanical Model of an Atom

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2020

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...

Research

JoVE Journal - Engineering

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Cited by 13 •

2014

We describe the reliable generation of non-Gaussian states of traveling optical fields, including single-photon states and coherent state superpositions, using a conditional preparation method operated on the non-classical light emitted by optical parametric oscillators. Type-I and type-II phase-matched oscillators are considered and common procedures, such as the required frequency filtering or the high-efficiency quantum state characterization by homodyning, are detailed.

Quantum Numbers

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2020

It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels. The energy levels are labeled with an n value, where n = 1, 2, 3, etc. Generally speaking, the energy of an electron in an atom is greater for greater values of n. This number, n, is referred to as the principal quantum number. The principal quantum number defines the...

Research

JoVE Journal - Engineering
Free Sample

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Cited by 2 •

2013

The gradient echo memory is a protocol for storing optical quantum states of light in atomic ensembles. Quantum memory is a key element of a quantum repeater, which can extend the range of quantum key distribution. We outline the operation of the scheme when implemented in a 3-level atomic ensemble.

Mechanical Protein Functions

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2020

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

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