Dicke effect: Difference between revisions
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{{Short description|Phenomenon in spectroscopy}} |
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'''Dicke effect''', also known as '''Dicke narrowing''' |
In [[spectroscopy]], the '''Dicke effect''', also known as '''Dicke narrowing''' or sometimes '''collisional narrowing''', 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) experiences with other particles.<ref>{{cite journal | author = R. H. Dicke | title = The Effect of Collisions upon the Doppler Width of Spectral Lines | journal = Physical Review | volume = 89 | pages = 472–473 | year = 1953 | issue = 2 | doi = 10.1103/PhysRev.89.472 | bibcode=1953PhRv...89..472D}}</ref><ref>{{cite book | first = Hans R. | last = Griem | year = 1997 | title = Principles of Plasmas Spectroscopy | publisher = University Press | location = Cambridge | isbn = 0-521-45504-9 }}</ref> |
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==Mechanism== |
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When the [[mean free path]] of an atom is much smaller than the [[wavelength]] of the [[Atomic_spectral_line|radiative transition]], the atom 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 atomic linewidth that is narrower than the Doppler width. |
When the [[mean free path]] of an atom is much smaller than the [[wavelength]] of the [[Atomic_spectral_line|radiative transition]], the atom 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 atomic linewidth that is narrower than the Doppler width. |
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==References== |
==References== |
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[[Category:Spectroscopy]] |
[[Category:Spectroscopy]] |
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Latest revision as of 23:23, 14 July 2022
In spectroscopy, the Dicke effect, also known as Dicke narrowing or sometimes collisional narrowing, 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) experiences with other particles.[1][2]
Mechanism
[edit]When the mean free path of an atom is much smaller than the wavelength of the radiative transition, the atom 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 atomic linewidth that is narrower than the Doppler width.
See also
[edit]References
[edit]- ^ R. H. Dicke (1953). "The Effect of Collisions upon the Doppler Width of Spectral Lines". Physical Review. 89 (2): 472–473. 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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