Huang Rhys factor

The Huang-Rhys factor is a measure of the interaction between the electrons bound to defects (such as color centers ) in a crystal and the phonons of the crystal and indicates the average phonons emitted during an electronic transition. Another example of the application of the Huang-Rhys factor is the interaction of molecular vibrations with electronic excitations.

If is the Stokes shift and the mean phonon energy, then the dimensionless Huang-Rhys factor is given by: ${\displaystyle \Delta }$ ${\displaystyle \hbar \omega }$ ${\displaystyle S}$

${\displaystyle S={\frac {\Delta }{2\hbar \omega }}}$

Sometimes will too

${\displaystyle S={\frac {\Delta }{2\hbar \omega }}+{\frac {1}{2}}}$

specified. Both values ​​are only approximately valid and intermediate values ​​also occur depending on the temperature.

literature

• Kun Huang, Avril Rhys: Theory of light absorption and non-radiative transitions in F-centers . In: Proc. Royal Society London, Series A . tape 204 , no. 1078 , December 22, 1950, p. 406-423 , doi : 10.1098 / rspa.1950.0184 (English, royalsocietypublishing.org [accessed September 29, 2018]).

Web links

• Huang-Rhys factor, spectrum lexicon of physics

Individual evidence

1. ^ Mathijs de Jong et al. a .: Resolving the ambiguity in the relation between Stokes shift and Huang-Rhys parameter, Physical Chemistry Chemical Physics, Volume 17, 2015, pp. 16959-16969, abstract