Excited
Excited state - Wikipedia, the free encyclopedia
Picture of a hydrogen atom changing from ground state to an excited state. NASA background information on ground and excited states ...
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excited - Synonyms from the Merriam-Webster Online Thesaurus
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excited: Definition, Synonyms from Answers.com
excited adj. Being in a state of excitement; emotionally aroused; stirred. Physics. ... Piglet was so excited at the idea of being useful that he forgot to be ...
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excited - Definition from the Merriam-Webster Online Dictionary
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Excited definition | Dictionary.com
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excited synonym | Thesaurus.com
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excited - Wiktionary
He was very excited about his promotion. (physics) Being in a state of higher energy. ... Retrieved from "http://en.wiktionary.org
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excited - Definition of excited at Your Dictionary
Definition of excited from Webster's New World Dictionary. Meaning of excited. Excited synonyms. ... We are all very excited about the prospect of seeing ...
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Excitation is an elevation in energy level above an arbitrary baseline energy state. In physics there is a specific technical definition for energy level which is often associated with an atom being excited to an excited state.
In quantum mechanics an excited state of a system (such as an atom, molecule or Atomic nucleus) is any quantum state of the system that has a higher energy than the ground state (that is, more energy than the absolute minimum).The temperature of a group of particles is indicative of the level of excitation.
The lifetime (see resonance) of a system in an excited state is usually short: Spontaneous emission or stimulated emission of a quantum of energy (such as a photon or a phonon) usually occurs shortly after the system is promoted to the excited state, returning the system to a state with lower energy (a less excited state or the ground state).
Atomic excitation A simple example of this concept comes by considering the hydrogen atom.
The ground state of the hydrogen atom corresponds to having the atom's single electron in the lowest possible atomic orbital (that is, the spherically symmetric "1s" wavefunction, which has the lowest possible quantum numbers). By giving the atom additional energy (for example, by the absorption of a photon of an appropriate energy), the electron is able to move into an excited state (one with one or more quantum numbers greater than the minimum possible). If the photon has too much energy, the electron will cease to be bound state to the atom, and the atom will become ionised.
Once the electron is in its excited state, we deem the hydrogen atom to be in its excited state. The atom may return to a lower excited state, or the ground state, by emitting a photon with a characteristic energy. Emission of photons from atoms in various excited states leads to an electromagnetic spectrum showing a series of characteristic emission lines (including, in the case of the hydrogen atom, the Lyman series, the Balmer series, the Paschen series, the Brackett series.)
Perturbed gas excitation A collection of molecules forming a gas can be considered in an excited state if one or more molecules are elevated to kinetic energy levels such that the resulting velocity distribution departs from the equilibrium Maxwell-Boltzmann statistics distribution. This phenomenon has been studied in the case of a two-dimensional gas in some detail, analyzing the time taken to relax to equilibrium.
See also
External links
- Picture of a hydrogen atom changing from ground state to an excited state
- NASA background information on ground and excited states