High-resolution electron-energy-loss spectroscopy of thin films of C_{60} on Si(100)

Gensterblum, G.; Pireaux, Jean‐Jacques; Thiry, P.A.; Caudano, R.; Vigneron, Jean‐Pol; Lambin, Philippe; Lucas, A. A.; Krätschmer, Wolfgang

doi:10.1103/physrevlett.67.2171

Cited by 290 publications

(95 citation statements)

References 17 publications

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“…The observed energy difference of ≈ 0.18 eV between the two most intense features in the spectrum shown in Fig. 4(c) is in agreement with electron energy loss spectroscopy results [28,29] and with calculations [30] for the splitting of the lowest C 60 triplet states. Therefore, the high-energy part of the spectrum in Fig.…”

Section: T2 (supporting

confidence: 90%

Fluorescence and Phosphorescence from IndividualC60Molecules Excited by Local Electron Tunneling

et al. 2005

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Using the highly localized current of electrons tunneling through a double barrier Scanning Tunneling Microscope (STM) junction, we excite luminescence from a selected C60 molecule in the surface layer of fullerene nanocrystals grown on an ultrathin NaCl film on Au(111). In the observed luminescence fluorescence and phosphorescence spectra, pure electronic as well as vibronically induced transitions of an individual C60 molecule are identified, leading to unambiguous chemical recognition on the single-molecular scale.PACS numbers: 68.37. Ef, 73.20.Mf, Light emission induced by electrons tunneling through the junction formed by the sample and the tip of a Scanning Tunneling Microscope (STM) has been proposed to characterize the optical properties of nanoscale objects at surfaces [1]. Contrary to conventional non-local techniques, the local character of this method offers the unique possibility to select and probe individual atoms, molecules or clusters on surfaces.Photon emission due to the decay of localized surface plasmons, excited by inelastic electron tunneling (IET) has been observed on metal surfaces [2,3], as well as on supported metallic nanoparticles [4]. Luminescence spectra have been acquired from semiconductor heterostructures [5], quantum well states of metallic films [6]. Recently, luminescence from supported molecules has been obtained [7,8] by successfully decoupling them from the metallic substrate in order to avoid quenching of the radiative transitions [9,10], using either a thin oxide film [7] or several molecular layers [8].However, unambiguous chemical identification of single complex molecules requires the observation and identification of several vibrational and/or electronicvibrational transitions, which are the spectroscopic fingerprint of the species. Here we present the first observation of energy resolved luminescence from an individually selected C 60 molecule excited by electrons tunneling through a double barrier STM junction. A comparison with the luminescence spectra obtained by non-local laser spectroscopy from dispersed C 60 molecules in rare gas and glass matrices [11,12,13,14,15,16], and from solid C 60 [17,18,19] enables us to demonstrate the molecular origin of the detected light and to identify the observed spectral features with pure electronic transitions and with vibronic transitions induced via Jahn-Teller (JT) and Herzberg-Teller (HT) coupling [20,21]. The present novel observation of both, fluorescence (singletto-singlet transitions) and phosphorescence (triplet-tosinglet transitions) constitutes a solid basis for the chemical identification of an individual C 60 molecule.C 60 nanocrystals were grown on NaCl layers deposited onto a Au(111) substrate. NaCl was evaporated from a Knudsen cell on a clean Au(111) surface at room temperature. Subsequently, the C 60 molecules were sublimated on the NaCl covered substrate. The experiments were performed with a homebuilt ultrahigh vacuum (UHV) STM operating at a temperature of 50 K, using cut PtIr tips. The photons emitted f...

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Section: T2 (supporting

confidence: 90%

Fluorescence and Phosphorescence from IndividualC60Molecules Excited by Local Electron Tunneling

et al. 2005

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“…therein). Experiments on C 60 monolayers assembled on metallic surfaces showed values ranging from 1.5 eV to 3.0 eV [28,29,30,31].…”

Section: Discussionmentioning

confidence: 99%

Resonant tunnelling through a C₆₀molecular junction in a liquid environment

et al. 2005

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Abstract.We present electronic transport measurements through thiolated C 60 molecules in liquid environment. The molecules were placed within a mechanically controllable break junction using a single anchoring group per molecule. When varying the electrode separation of the C 60 -modified junctions, we observed a peak in the conductance traces. The shape of the curves is strongly influenced by the environment of the junction as shown by measurements in two distinct solvents. In the framework of a simple resonant tunneling model, we can extract the electronic tunneling rates governing the transport properties of the junctions.

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“…To the first order in α we get from (26) which introduced in (28) yields u1 = α f (θ), where the denominator being always negative as required by the stability conditions (11). Equation (29) can easily be solved for f with the boundary condition f(0) = -f (π -θ), so that we get the displacements and where…”

Section: Rotations and Deformationsmentioning

confidence: 99%

“…Electron stucture [3][4][5], molecular polarizability [6,7] and ion dynamics [8,9] of such an object have extensively been studied, many of the molecular vibrations having been identified by various spectroscopic techniques [10][11][12], most notably in Raman and infrared spectra [13]. Comparatively little attention was given to a certain class of low-energy molecular states, which may show themselves in the thermal properties [14], consisting of rotations and long-wavelength vibrations that do not involve an electric moment.…”

Section: Introductionmentioning

confidence: 99%

Deformation of a Spherical Molecule

Apostoł

1995

Acta Phys. Pol. A

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The deformation suffered by a hollow, spherical molecule as an effect of rotations is studied within a continuum model which might be relevant for the fullerene molecule. The spherical elasticity is established to the lowest order in deformations and the natural perturbation parameter required by the stability of the object is identified as the square ratio of the rotation to the radial vibration pnlsations. Ht is also shown that the main effect of the centrifugal coupling between rotations and radial vibrations is a static deformation whose energy is beyond the harmonic approximation.

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High-resolution electron-energy-loss spectroscopy of thin films of C_{60} on Si(100)

Cited by 290 publications

References 17 publications

Fluorescence and Phosphorescence from IndividualC60Molecules Excited by Local Electron Tunneling

Fluorescence and Phosphorescence from IndividualC60Molecules Excited by Local Electron Tunneling

Resonant tunnelling through a C₆₀molecular junction in a liquid environment

Deformation of a Spherical Molecule

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High-resolution electron-energy-loss spectroscopy of thin films of C_{60} on Si(100)

Cited by 290 publications

References 17 publications

Fluorescence and Phosphorescence from IndividualC60Molecules Excited by Local Electron Tunneling

Fluorescence and Phosphorescence from IndividualC60Molecules Excited by Local Electron Tunneling

Resonant tunnelling through a C60molecular junction in a liquid environment

Deformation of a Spherical Molecule

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Resonant tunnelling through a C₆₀molecular junction in a liquid environment