1995
DOI: 10.1103/physrevb.52.r5550
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Investigation of the absorption edge ofC60fullerite

Abstract: Absorption measurements on single crystals of C60 fullerite have been performed as a function of temperature, hydrostatic pressure, and magnetic field in the optical visible range. Various structures observed in the fundamental absorption edge are assigned to excitonic transitions based on comparison with calculations, including many-electron and electron-hole interaction effects. The strength of the electron-phonon interaction is discussed in view of these results.The electronic structure of the fullerites ha… Show more

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Cited by 29 publications
(13 citation statements)
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“…The shift at higher temperatures can only be explained by electron phonon interaction. 25,29 The total energy shift of the triplet exciton between 100 and 300 K is comparable to that of the bulk singlet excitons at 1.8-2.0 eV measured by optical absorption and second-harmonic generation. 18,29 The exciton shift above T S in the 1.7-ML film is appreciably smaller.…”
mentioning
confidence: 56%
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“…The shift at higher temperatures can only be explained by electron phonon interaction. 25,29 The total energy shift of the triplet exciton between 100 and 300 K is comparable to that of the bulk singlet excitons at 1.8-2.0 eV measured by optical absorption and second-harmonic generation. 18,29 The exciton shift above T S in the 1.7-ML film is appreciably smaller.…”
mentioning
confidence: 56%
“…25,29 The total energy shift of the triplet exciton between 100 and 300 K is comparable to that of the bulk singlet excitons at 1.8-2.0 eV measured by optical absorption and second-harmonic generation. 18,29 The exciton shift above T S in the 1.7-ML film is appreciably smaller. It is likely that the bonding with the substrate strongly reduces the amplitude of the vibrations and librations of the chemisorbed first layer, decreasing the effect of the electron-phonon renormalization of the gap of the second layer.…”
mentioning
confidence: 56%
“…It is important to mention that a red shift of the absorption bands is consistent with a closer packing of the C 60 molecules observed in going from the free molecules in solution to the solid phase, and to those experiments where an increase of the optical absorption of solid C 60 subjected to external pressure for photon energies less than^2 eV is observed. [16,17] In any case, the strong change in the optical absorption spectrum for our cluster system remains to date an open question, mainly because in principle, one should not expect such a noticeable change due to the fact that the interaction between C 60 molecules is weak.…”
mentioning
confidence: 98%
“…For the icosahedral point group the gap transition of C 60 splits into a multiplet with 4 components having 1 T 1g , 1 T 2g , 1 G g and 1 H g symmetry [6]. While there exist several studies of the low energy components and their excitation energies [7,8], the energy of the highest lying 1 H g excitation and thus the total width of the multiplet have not been experimentally determined yet, although it has important consequences for the understanding of optical properties such as e.g. second or third harmonic generation (SHG, THG) [9,10].…”
mentioning
confidence: 99%