Showing papers by "Richard D. Averitt published in 1994"
TL;DR: In this article, a method was described which utilizes the difference in vapor pressure between C60 and heavier fullerenes to produce ultra-high purity C60, which shows promise in the purification of more exotic fullerene compounds.
Abstract: A method is described which utilizes the difference in vapor pressure between C60 and heavier fullerenes to produce ultrahigh purity C60. Fullerene extract is introduced into one end of a distillation column with a series of evenly spaced perforated baffles inside. The extract is heated to 970 K under high vacuum, and a linear temperature gradient is established along the column. As the mixed fullerene vapor effuses down the column, it becomes enriched in the more volatile species. C60 with a purity of 99.97% has been obtained. This method shows promise in the purification of more exotic fullerene compounds.
14 citations
TL;DR: In this article, the authors report a technique that extends the dynamic range of time resolved measurements to greater than seven orders of magnitude from femtoseconds to microseconds, which is applied to two organic dye solutions for the measurement of intersystem crossing rates and triplet state lifetimes.
4 citations
TL;DR: In this article, a method for obtaining solvent free high purity C60 was described, which achieved a purity as high as 99.97 % using photoluminescence spectroscopy.
Abstract: We describe a method for obtaining solvent free high purity C60. Purities of as great as 99.97 % have been obtained. Films grown from this high purity source material have been studied using photoluminescence spectroscopy. In addition, films have been grown with intentional addition of solvent impurities. Spectral broadening due to impurity-induced site disorder is observed in the photoluminescence spectra of these films.
3 citations