Highly structured singlet oxygen photoluminescence from crystallineC60

Fullerenes

“…The upper two PL spectra in the figure are from 18 C>2 and 16 C>2, respectively, whereas the bottom vibrational spectrum is obtained from inelastic neutron scattering studies of microcrystalline C 60 powders. 133 As can be seen from the figure, remarkably good agreement is obtained between the PL vibrational sidebands and the more conventional inelastic neutron scattering probe. Furthermore, the higher energy mode structure (>700 cm" 1 ) is much sharper in the PL data than in the inelastic neutron scattering data, thereby yielding more reliable values for the mode frequencies.…”

“…IX). Raman scattering studies had shown previously that this coupling is indeed weak, as 133 The photon energy scale for the PL is shown on the top, and directly below is a vibrational mode energy scale measured from the purely electronic principal transition, labeled El. The asterisks indicate the O2 vibrational mode replica of the strong doublet.…”

“…17). 133 Other techniques providing detailed information on all vibrational modes include inelastic neutron scattering 134 and electron energy loss spectroscopy. The applicability of the photoluminescence technique to probe fundamental vibrational excitations of C6o is based on the weak vibronic coupling of the intercalated O 2 molecules to the C 6 o lattice (see Sec.…”

Влияние Молекулярного Йода На Люминесценцию Синглетного Кислорода В Тетрахлорметане

“…Наряду с наблюдавшимися ранее более слабыми максимумами люминесценции на длинах волн 1415 и 1588 nm [1][2][3] в спектре синглетного кислорода из раствора бенгаль-ского розового в CCl 4 появилась еще одна сателлитная линия с λ m = 1372 nm, подобная той, которая наблю-далась в растворителях типа C 2 F 4 Br 2 [2], содержащих тяжелые атомы галогенов. Авторы работы [2] связали эту линию со стоксовой компонентой, индуцирован-ной колебаниями связи C−Br растворителя с частотой 513 сm −1 по аналогии с линией на длине волны 1415 nm, индуцированной колебаниями связи C−Cl растворителя с частотой 770 сm −1 .…”

Influence of Oxygen Impurities on Electrical Properties of Fullerene C60

“…Much research has been devoted to the studies of the interaction of oxygen with C60 fullerene [1][2][3][4][5][6][7][8][9][10][11]. Molecular oxygen is reported to be absorbed but not to react with the C60-molecules at room temperature (e.g.…”