Electronic Tuning of Dynamical Charge Transfer at an Interface: K Doping of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>C</mi></mrow><mrow><mn>60</mn></mrow></msub></mrow><mo>/</mo><mi>A</mi><mi>g</mi><mo>(</mo><mn>111</mn><mo>)</mo></math></span>

A. Peremans; Y. Caudano; P. A. Thiry; P. Dumas; W. Q. Zhang; A. Le Rille; A. Tadjeddine

doi:10.1103/PhysRevLett.78.2999

Electronic Tuning of Dynamical Charge Transfer at an Interface: K Doping of $C_{60} / A g (111)$

A. Peremans, Y. Caudano, P. A. Thiry, P. Dumas, W. Q. Zhang, A. Le Rille, and A. Tadjeddine

Phys. Rev. Lett. 78, 2999 – Published 14 April 1997

Abstract

High-resolution vibrational spectroscopy of fullerene thin films is achieved by sum-frequency generation and infrared absorption. The $A_{g} (2)$ mode of $C_{60}$ gains strong infrared activity when the molecule is adsorbed on Ag(111). K doping allows us to demonstrate the process of adsorbate/substrate dynamical charge transfer, by showing, for the first time, the quenching of the mode softening and infrared activity upon tuning of the admolecule electronic properties. These observations enable the quantitative evaluation of the coupling strength of the $A_{g} (2)$ vibration to the $t_{1 u}$ orbital of $C_{60}$ .

Received 9 August 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.2999

Authors & Affiliations

A. Peremans, Y. Caudano, and P. A. Thiry

Laboratoire de Spectroscopie Moléculaire de Surface, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, 61 Rue de Bruxelles, B-5000 Namur, Belgium

P. Dumas, W. Q. Zhang, A. Le Rille, and A. Tadjeddine