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A survey is given of experimental studies of electron attachment and recombination in dense molecular media, from which information on the efiect of van der Waals potentials or on the existence of surrounding molecules on these processes is obtained. The investigation of the dynamic behaviour of low-energy electrons such as electron transport and reactivities in dense molecular media is of essential importance in both fundamental and applied sciences (Hatano and Shimamori 1981; Warman 1982; Christophorou and Siomos 1984; Johnsen and Lee 1985; Morgan 1985; Hatano 1986, 1994; Freeman 1987; Holroyd 1987; Holroyd and Schmidt 1989; Shinsaka and Hatano 1990, 1993; Sanche 1991). Values of the electron mobility "e have been measured extensively in a variety of dense molecular media and several theoretical models have been proposed for the transport mechanism. Electron reactivities with solute molecules or positive ions in these media have been also extensively investigated. The former reaction is electron attachment and the latter electron{ion recombination. The investigation of these electron reactivities has provided new insight into the behaviour of low-energy electrons in matter. In the following, a brief survey is given of the investigation of these electron reactivities, divided into attachment and recombination to summarise distinctive features of these reactivities in dense molecular media, as compared to those in low density gases as well as in beams.

Electron Attachment and Recombination in Dense Molecular Media