Cheeger constant: Difference between revisions

Revision as of 14:03, 15 July 2013

Dexter electron transfer is a quenching mechanism in which an excited electron state transfers from one molecule (a donor) to a second molecule (an acceptor). This process requires a wavefunction overlap between the donor and acceptor, which means it can only occur at short distances; typically of the order 15-20 Å. The excited state may be exchanged in a single step, or in two separate charge exchange steps.

The Dexter energy transfer rate, $k_{ET}$ , is indicated by the proportionality

k_{ET}\varpropto J\mathrm {exp} \left[{\frac {-2r}{L}}\right]

where $r$ is the separation of the donor from the acceptor, $L$ is the sum of the Van der Waals radii of the donor and the acceptor, and $J$ is the spectral overlap integral defined by

J=\int f_{\rm {D}}(\lambda )\,\epsilon _{\rm {A}}(\lambda )\,\lambda ^{4}\,d\lambda

External links

Dexter Energy Transfer at ChemWiki

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+{{noreferences|date=June 2013}}
+'''Dexter electron transfer''' is a [[quenching (fluorescence)|quenching mechanism]] in which an [[Excited state|excited]] [[electron]] state transfers from one [[molecule]] (a [[Electron donor|donor]]) to a second molecule (an [[Electron acceptor|acceptor]]).  This process requires a [[Wave function|wavefunction]] overlap between the donor and acceptor, which means it can only occur at short distances; typically of the order 15-20 Å.  The excited state may be exchanged in a single step, or in two separate charge exchange steps.
+The Dexter energy transfer rate, <math>k_{ET}</math>, is indicated by the proportionality
+:<math>k_{ET} \varpropto J \mathrm{exp}\left [ \frac{-2r}{L} \right ] </math>
+where <math>r</math> is the separation of the donor from the acceptor, <math>L</math> is the sum of the [[Van der Waals radius|Van der Waals radii]] of the donor and the acceptor, and <math>J</math> is the spectral overlap integral defined by
+:<math> J = \int f_{\rm D}(\lambda) \, \epsilon_{\rm A}(\lambda) \, \lambda^4 \, d\lambda </math>
+== See also ==
+* [[Fluorescence]]
+* [[Quenching (fluorescence)|Quenching]]
+* [[Förster resonance energy transfer]]
+== External links ==
+* [http://chemwiki.ucdavis.edu/Theoretical_Chemistry/Fundamentals/Dexter_Energy_Transfer Dexter Energy Transfer] at ChemWiki
+[[Category:Atomic physics]]
+[[Category:Fluorescence]]
+{{physics-stub}}

Cheeger constant: Difference between revisions

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