Download or read book Spectral Shifts and Broadening of the Fluorescence of Anthracene and Tetracene in Several Host Crystals at High Pressures written by Peter F. Jones and published by . This book was released on 1968 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fluorescence spectra of anthracene in biphenyl, p-terphenyl, naphthalene, and phenanthrene and those of tetracene in p-terphenyl, naphthalene, phenanthrene, and anthracene were measured at pressures as great as 50 kbar. Contrary to the unexpected behavior found in the spectra of the pure hosts, the pressure effects on the spectra of the guests are generally analogous to the pressure effects in solution or the gas phase. Due to the increased dispersion interaction between these nonpolar molecules upon compression, the energies of the electronic transitions are shifted toward the red (lower energy) and the spectral bands are broadened, while the integrated intensity remains approximately constant. As the pressure is released, the fluorescence spectra return to those obtained before compression. The spectral shifts with pressure are satisfactorily interpreted in terms of a second-order perturbation theory using a dipole - dipole approximation. For three of the eight guest - host combinations, the fluorescence spectra above 35 kbar were considerably broader than expected. The similar broadening observed for the pure host crystals suggests that mixed excimers are produced at high pressures. On the basis of the present data, however, it is not possible to give an unambiguous explanation of the extensive broadening. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1969 with total page 1508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorescence of Doped Crystals of Anthracene Naphthalene and Phenanthrene Under High Pressures the Role of Excimers in Energy Transfer to the Guest Molecules written by Peter F. Jones and published by . This book was released on 1968 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorescence spectra of crystals of anthracene, naphthalene, phenanthrene doped with other polycyclic aromatic hydrocarbons have been studied at pressures as great as 50 kbar. The most significant effects of pressure on the spectra of the host crystals are a loss of intensity of the normal fluorescence with increasing pressure and the almost simultaneous appearance of a broad, featureless emission at energies about 3000 to 6000/cm lower than that of the normal fluorescence. This emission is assigned as the fluorescence of excimers formed upon optical excitation of the crystals under high pressure. The growth of the intensity of the excimer emission with increasing pressure, relative to the intensity of the normal fluorescence, is the same in doped crystals as in pure crystals. The intensities of the guest molecule fluorescences relative to the intensity of the normal host fluorescence in the various doped crystals increase with pressure at about the same rate as the intensity of the excimer emission. These observations are interpreted as indicating that excimers are the lowest-energy excited singlet species of aromatic molecular crystals at these pressures and that, when the excimer concentration is appreciable, the path of energy transfer is from the host via excimers to the guest. (Author).
Download or read book Current Chemical Papers written by and published by . This book was released on 1968 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt: A classified world list of new papers in pure chemistry.
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1968-05 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Temperature Spectroscopy written by Carl Meyer and published by Elsevier Publishing Company. This book was released on 1971 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fluorescent and Absorption Spectra of Anthracene and Phenanthrene Vapors written by Thomas Sidney Elston and published by . This book was released on 1907 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research and Development Reports written by and published by . This book was released on 1968-04 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fluorescence of Anthracene written by Louisa Stone Stevenson and published by . This book was released on 1911 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Fluorescence Literature written by Richard A. Passwater and published by Springer. This book was released on 1967 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: In v.1 entries are arranged in chronological sections covering three to four years; in v.2 articles are grouped insix major classifications: (1) Analytical, organic; (2) Analytical, inorganic; (3) Theoretical; (4) Immunofluorescence; (5) Phosphors; (6) Addendum.
Download or read book Delayed fluorescence excitation spectra in doped anthracene cry written by Niklaus Graber and published by . This book was released on 1977 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography on High Pressure Research in Chemistry and Physics written by and published by . This book was released on 1968 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Pressure Bibliography 1900 1968 Subject index written by and published by . This book was released on 1970 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research and Development Reports Index written by and published by . This book was released on 1968 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1968 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1968 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1968 with total page 1592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
