Changes in the dipolar vibrational fingerprint of C60 upon adsorption and K intercalation

Christophe Silien; Y. Caudano; A. Peremans; P. A. Thiry

doi:10.1016/S0169-4332(00)00231-2

Changes in the dipolar vibrational fingerprint of C60 upon adsorption and K intercalation

Christophe Silien, Y. Caudano, A. Peremans, P. A. Thiry

Department of Physics

Universite de Namur

Research output: Contribution to journal › Article › peer-review

Abstract

The HREELS spectra of a Ca₆₀ monolayer deposited on Ag(111) show evidences for a strong chemical bonding with the Ag substrate, accompanied by a charge transfer of about 1 electron per adsorbed molecule. K atom intercalation in the adsorbed layer allows an easy tuning of the C₆₀ LUMO (t_lu) occupancy. The evolution of the C₆₀ intramolecular vibrational spectrum upon K intercalation is studied by HREELS and discussed with particular emphasis on the two A_g (Raman active) and four T_lu (IR active) modes. Both A_g modes exhibit at the interface dipolar activity explained by electron-phonon coupling. Upon K intercalation, the T_lu modes show an evolution similar to what is observed in K- or Rb-doped bulk C₆₀, allowing to identify C₆₀^6- as the saturated phase.

Original language	English (Ireland)
Pages (from-to)	445-451
Number of pages	7
Journal	Applied Surface Science
Volume	162
DOIs	https://doi.org/10.1016/S0169-4332(00)00231-2
Publication status	Published - 1 Aug 2000
Event	5th International Symposium on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN-5) - Provence, France Duration: 6 Jul 1999 → 9 Jul 1999

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title = "Changes in the dipolar vibrational fingerprint of C60 upon adsorption and K intercalation",

abstract = "The HREELS spectra of a Ca60 monolayer deposited on Ag(111) show evidences for a strong chemical bonding with the Ag substrate, accompanied by a charge transfer of about 1 electron per adsorbed molecule. K atom intercalation in the adsorbed layer allows an easy tuning of the C60 LUMO (tlu) occupancy. The evolution of the C60 intramolecular vibrational spectrum upon K intercalation is studied by HREELS and discussed with particular emphasis on the two Ag (Raman active) and four Tlu (IR active) modes. Both Ag modes exhibit at the interface dipolar activity explained by electron-phonon coupling. Upon K intercalation, the Tlu modes show an evolution similar to what is observed in K- or Rb-doped bulk C60, allowing to identify C606- as the saturated phase.",

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T1 - Changes in the dipolar vibrational fingerprint of C60 upon adsorption and K intercalation

AU - Silien, Christophe

AU - Caudano, Y.

AU - Peremans, A.

AU - Thiry, P. A.

PY - 2000/8/1

Y1 - 2000/8/1

N2 - The HREELS spectra of a Ca60 monolayer deposited on Ag(111) show evidences for a strong chemical bonding with the Ag substrate, accompanied by a charge transfer of about 1 electron per adsorbed molecule. K atom intercalation in the adsorbed layer allows an easy tuning of the C60 LUMO (tlu) occupancy. The evolution of the C60 intramolecular vibrational spectrum upon K intercalation is studied by HREELS and discussed with particular emphasis on the two Ag (Raman active) and four Tlu (IR active) modes. Both Ag modes exhibit at the interface dipolar activity explained by electron-phonon coupling. Upon K intercalation, the Tlu modes show an evolution similar to what is observed in K- or Rb-doped bulk C60, allowing to identify C606- as the saturated phase.

AB - The HREELS spectra of a Ca60 monolayer deposited on Ag(111) show evidences for a strong chemical bonding with the Ag substrate, accompanied by a charge transfer of about 1 electron per adsorbed molecule. K atom intercalation in the adsorbed layer allows an easy tuning of the C60 LUMO (tlu) occupancy. The evolution of the C60 intramolecular vibrational spectrum upon K intercalation is studied by HREELS and discussed with particular emphasis on the two Ag (Raman active) and four Tlu (IR active) modes. Both Ag modes exhibit at the interface dipolar activity explained by electron-phonon coupling. Upon K intercalation, the Tlu modes show an evolution similar to what is observed in K- or Rb-doped bulk C60, allowing to identify C606- as the saturated phase.

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U2 - 10.1016/S0169-4332(00)00231-2

DO - 10.1016/S0169-4332(00)00231-2

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JF - Applied Surface Science

T2 - 5th International Symposium on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN-5)

Y2 - 6 July 1999 through 9 July 1999

ER -

Changes in the dipolar vibrational fingerprint of C60 upon adsorption and K intercalation

Abstract

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