ISSN:
1572-8951
Keywords:
Charge transfer
;
organic films
;
Stark spectroscopy
;
Langmuir-Blodgett films
;
pyroelasticity
;
photoinduced polarization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract A transition of an organic molecule from the ground into an excited state is often accompanied by the intra-molecular electronic (or ionic) charge transfer. A degree of this spatial charge transfer may be expressed in terms of the difference Δμ between electrical dipole moments of the excited and the ground states. The same is true for the inter-molecular transitions in condensed media, namely, crystals, amorphous films, liquid and solid solutions, etc. The degree of the charge transfer determines the magnitude of various physical effects such as the electro-optical (Stark) effect, optical second harmonic generation, photo-induced polarization, pyro-electric effect and others. The quadratic Stark-effect can be used for a quantitative determination of the charge transfer degree Δμ, the other effects can be understood in terms of the charge transfer. This paper is a brief review of various experimental data mostly obtained by the authors which allow the quantitative interpretation using the concept of the charge transfer.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00625734
Permalink
