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Level Width

Applicable units are those of quantitykind:LevelWidth

The "Level Width" is the uncertainty in the energy of a quantum-mechanical system having discrete energy levels in a state that is not strictly stationary. The system may be an atom, a molecule, or an atomic nucleus.

http://encyclopedia2.thefreedictionary.com/Level+Width

http://www.iso.org/iso/catalogue_detail?csnumber=31895

$\Gamma = \frac{\hbar}{\tau}$, where $\hbar$ is the reduced Planck constant and $\tau$ is the mean lifetime.

$\Gamma$

The "Level Width" is the uncertainty in the energy of a quantum-mechanical system having discrete energy levels in a state that is not strictly stationary. The system may be an atom, a molecule, or an atomic nucleus.