- published: 17 Feb 2016
- views: 18771
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 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 (with the notable exception of systems that exhibit Negative temperature).
The lifetime of a system in an excited state is usually short: spontaneous or induced 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). This return to a lower energy level is often loosely described as decay and is the inverse of excitation.
LuHan 鹿晗【Excited 封印】Official MV
LuHan鹿晗_EXCITED(封印) DANCE VER.
[1080P] 160318 LUHAN - EXCITED (封印) Reloaded Concert Rehearsal
I'M SO EXCITED!!! (3.31.16 - Day 2528)
The Pointer Sisters - I'm So Excited
The pointer sisters - I'm so excited
Pointer Sisters - I'm So Excited.
Chief Keef - Excited
LUHAN 鹿晗 - Excited (封印) REACTION
LuHan鹿晗_Excited封印_Official Music Video Teaser
LuHan - Excited MV Reaction [Little Freestyle tho]
Excited Masseuse (HD)
Why We're Excited for X-Men Apocalypse - The Superhero Show
BRONER GETS EXCITED WATCHING ROBERT EASTER'S FIGHT BEFORE THEOPHANE CLASH: BEHIND-THE-SCENES LOOK