Dicke effect: Difference between revisions
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==Effect== |
==Effect== |
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When the [[mean free path]] of |
When the [[mean free path]] of a dicke is much smaller than the [[wavelength]] of the [[Atomic_spectral_line|radiative transition]], the dicke changes [[velocity]] and direction many times during the [[emission spectrum|emission]] or [[absorption (electromagnetic radiation)|absorption]] of a [[photon]]. This causes an averaging over different Doppler states and results in an dicke linewidth that is narrower than the Doppler width. |
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==See also== |
==See also== |
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Revision as of 12:11, 4 December 2013
Dicke effect, also known as Dicke narrowing (or sometimes collisional narrowing) in spectroscopy, named after Robert H. Dicke, refers to narrowing of the Doppler broadening of a spectral line due to collisions the emitting species (usually an atom or a molecule) experience with other particles.[1][2]
Effect
When the mean free path of a dicke is much smaller than the wavelength of the radiative transition, the dicke changes velocity and direction many times during the emission or absorption of a photon. This causes an averaging over different Doppler states and results in an dicke linewidth that is narrower than the Doppler width.
See also
References
- ^ R. H. Dicke (1953). "The Effect of Collisions upon the Doppler Width of Spectral Lines". Physical Review. 89: 472. Bibcode:1953PhRv...89..472D. doi:10.1103/PhysRev.89.472.
- ^ Griem, Hans R. (1997). Principles of Plasmas Spectroscopy. Cambridge: University Press. ISBN 0-521-45504-9.
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