Eur. Phys. J. B 38, 395-402 (2004)
https://doi.org/10.1140/epjb/e2004-00133-x

Saturation of the ODMR effect on singlet exciton induced emission in molecular crystals: Application to crystalline tetracene

¹ Faculté des Sciences de Tunis, Laboratoire de Physique de la Matière Condensée, Campus Universitaire, Tunis 1002, Tunisia
² École Supérieure des Sciences et Techniques de Tunis, 1008 Montfleury, Tunis, Tunisia
³ Département de Physique, Faculté des Sciences de Bizerte, 7021 Jarzouna, Bizerte, Tunisia
⁴ Groupe de Physique des Solides, Universités Paris 6 et 7, Tour 23, 2 place Jussieu, 75251 Paris Cedex 05, France

Corresponding author: ^a tarek.barhoumi@webmails.com

Received: 25 August 2002
Revised: 22 September 2003
Published online: 28 May 2004

Abstract

We have studied the variation of the ODMR effect according to the intensity of a microwave field. We have highlighted a saturation effect of ODMR lines. This effect has been studied as part of the kinetic theory by developing the pilot equation while utilizing for the first time the formalism of a superoperator coupled with a time dependent sinusoidal perturbation. The agreement of the best fit between the experiment and the theory gives the mixing between singlet and quintuplet states, which seems to depend on the direction of the applied magnetic field.