Colloids and Surfaces A: Physicochemical and Engineering Aspects 149 (1999) 427–429 The mechanism of luminescence by laser light on aqueous solution surfactants P.K. Khabibullaev *, Sh.I. Mamatkulov, Yu.V. Pakharukov, A.A. Saidov Heat Physics Department of the AS of Uzbekistan, 700135 Katartal str. 28, Tashkent, Uzbekistan Received 21 August 1997; accepted 16 July 1998 Abstract In this study the mechanism of luminescence of aqueous solution surfactants has been considered. It is shown that at the point of micellization the intensity of luminescence non-linearity depends on aggregate size. Experimental results on the action of laser light on aqueous solutions of sodium octylbenzene sulphonate confirm that in the process of photoionization active parts are taken by not only donor electrons solubilized in micelles but also electrons of surfactant molecules. © 1999 Elsevier Science B.V. All rights reserved. Keywords: Luminescence; Surfactants; Photoionization Photoionization of aromatic hydrocarbons and electrons in them have lower A values and the subsequent reactions of electronic transport in subject of this study is the possible transport bioaggregates constitute a model of processes pos- mechanism of these electrons under the influence sibly playing the main role in photosynthesis and of laser light. It has been shown [2,3] that in a electronic transport in membranes. An ideal model surfactant solution neutral short-term potential for the study of such phenomena may be aqueous wells can be formed which are randomly distrib- solutions of surfactant molecules which have aro- uted in space. Such potential wells appear as a matic fragments. In recent years the attention of result of fluctuations of valence connection lengths many researchers has been concentrated on the and the angles between them, i.e. as a result of study of extinguishing fluorescence in active centers conformational changes of hydrocarbon chains. It and the change in chemical reaction speeds in a especially amplifies near the critical point of micel- micellar environment under the influence of lasers lization where the fluctuation grows. The occur- and radiation [ 1 ]. However, the response of amphi- rence of a fluctuation in surfactant monomer philic molecules and their aggregates to these concentration leads to an increase in the thermo- effects has until recently not been studied. The dynamic potential (TP) of system and after some reason for this was the complexity of the objects time it will ‘‘be resolved’’. However this locality considered and the high ionization potential A of congestion of surfactant molecules can lead to amphiphile molecules. However molecules with conformational changes in hydrocarbon tails, as a aromatic fragments due to the presence of p consequence of which potential wells appear. If an electron becomes localized in one of these wells * Corresponding author. Fax: +37 279 8668. then its energy decreases. Furthermore, if this 0927-7757/99/$ – see front matter © 1999 Elsevier Science B.V. All rights reserved. PII S0927-7757(98)00671-2