title: Luminescence of ion-pair states of halogens in liquid perfluorocarbons.
abstract: The I(2)(D'-A') luminescence in liquid C(7)F(16), C(8)F(18), C(9)F(20), and C(12)F(26) has been observed following irradiation with visible (within the I(2) X → B band region) and UV (λ < 300 nm) lasers. The band is shifted by ~2000 cm(-1) to the red relative to the gas phase and is significantly broader (fwhm ≈ 3000 cm(-1) vs 500 cm(-1) in the gas phase). Two-color excitation of other halogens in C(n)F(2n+2) solvents revealed similarly shifted and strongly broadened D'-A' bands of Br(2), IBr, and BrCl. The stability of the ion-pair states of halogens in room temperature liquids opens new experimental opportunities for condensed phase studies and may be of applied interest considering the increasing industrial applications of perfluorocarbons.
authors.affiliation: Institute of Physics, St. Petersburg State University, Ul'janovskaja St.1, Peterhof, 198504 St. Petersburg, Russia. vadim-alekseev@mail.ru
authors.forename: Vadim A
authors.initials: VA
authors.lastname: Alekseev
authors.forename: Peter J M
authors.initials: PJ
authors.lastname: van der Burgt
authors.forename: John G
authors.initials: JG
authors.lastname: McCaffrey