Showing papers on "Pentacene published in 1976"
TL;DR: In this paper, the results of a photon-echo relaxation study on the lowest 1 B 2u ← 1 A 1g transition of tetracene and pentacene in a p-terphenyl host crystal are reported.
70 citations
01 Nov 1976
TL;DR: The results of a low temperature Stark effect study on the visible short axis polarized singlet transitions of tetracene and pentacene are presented and discussed in this paper, where the full anisotropy of the Stark effect could be obtained reliably only by using bipolar electric field modulation together with an optical multichannel detection system.
Abstract: The results of a low temperature Stark-effect study on the visible short axis polarized singlet transitions of tetracene and pentacene are presented and discussed. The full anisotropy of the Stark effect could be obtained reliably only by using bipolar electric field modulation together with an optical multichannel detection system. This system is also briefly described in this paper. Using the anisotropic Lorentz approximation the difference polarizability tensor components are found to be: for tetracene ΔαLL = 29 ± 3 A3, ΔαMM = 25 ± 4 A3, ΔαNN = 5 ± 5 A3; and for pentacene ΔαLL = 53 ± 4 A3, ΔαMM = 90 ± 8 A3, and ΔαNN = -11 ± 9 A3. The paper emphasizes that these numbers, due to the inherent approximations of the Lorentz approximation, should be handled with great caution.
35 citations
TL;DR: In this paper, the photoelectron spectra (energy distribution curves, ECDs) of naphthacene and pentacene, perylene, coronene, and p-terphenyl were measured for evaporated polycrystal films.
Abstract: The photoelectron spectra (energy distribution curves, ECDs) of naphthacene, pentacene, perylene, coronene, and p-terphenyl by He(I), Ne(I), and Ar(I) resonance lines (photon energies, 11.62–21.22 eV) and the absorption spectra of naphthacene, pentacene, perylene, and coronene at 4–9.5 eV are measured for evaporated polycrystal films. The absorption spectra are compared with the spectral dependence of the quantum yield (SDQY) of photoemission. A similar comparison is also made for p-terphenyl and anthracene. The origin of the structures in SDQY curves is discussed. The analysis reveals that: (1) the MOs of a molecule are preserved even in crystals; (2) the large peak at a low kinetic energy of the photoelectron spectra is due to secondary electrons, and (3) at least for naphthacene, pentacene, and coronene, autoionization takes place with a considerable efficiency.
33 citations
TL;DR: In this article, it was shown that intramolecular vibrational energy redistribution is a fast process compared with electronic relaxation for aromatic molecules with large excess vibrational energies, which is consistent with three previous observations relating to the energy dependence of radiationless decay rate, including the energy gap law.
31 citations
TL;DR: In this article, the electron-attenuation lengths of pentacene and perylene evaporated polycrystalline films, deposited onto copper iodide (CuI) film as electron source, were measured.
21 citations
TL;DR: In this article, the photoelectron spectra (energy distribution curves, ECDs) of naphthacene and pentacene, perylene, coronene, and p-terphenyl were measured for evaporated polycrystal films.
Abstract: The photoelectron spectra (energy distribution curves, ECDs) of naphthacene, pentacene, perylene, coronene, and p-terphenyl by He(I), Ne(I), and Ar(I) resonance lines (photon energies, 11.62–21.22 eV) and the absorption spectra of naphthacene, pentacene, perylene, and coronene at 4–9.5 eV are measured for evaporated polycrystal films. The absorption spectra are compared with the spectral dependence of the quantum yield (SDQY) of photoemission. A similar comparison is also made for p-terphenyl and anthracene. The origin of the structures in SDQY curves is discussed. The analysis reveals that: (1) the MOs of a molecule are preserved even in crystals; (2) the large peak at a low kinetic energy of the photoelectron spectra is due to secondary electrons, and (3) at least for naphthacene, pentacene, and coronene, autoionization takes place with a considerable efficiency.
1 citations