Gold adatom as a key structural component in self-assembled monolayers of organosulfur molecules on Au(1 1 1)
Nonlocal dissociative chemistry of adsorbed molecules induced by localized electron injection into metal surfaces.
A novel approach to surface chemistry studies using scanning tunneling microscopy (STM), where dissociation of molecules adsorbed on metal surfaces is induced nonlocally in a 10-100 nm radius by hot electrons that originate from the STM tip and transport on the surface.
Optical second-harmonic generation induced by electric current in graphene on Si and SiC substrates
We find that the flow of direct electric current (dc) through graphene on substrate enhances surface optical second-harmonic generation (SHG) from the graphene/substrate system. The current can…
Surface bonding and dynamical behavior of the CH3SH molecule on Au(111).
- P. Maksymovych, D. Sorescu, D. Dougherty, J. Yates
- Chemistry, PhysicsJournal of Physical Chemistry B
- 1 December 2005
The chemisorption of the undissociated CH3SH molecule on the Au(111) surface has been studied at 5 K using scanning tunneling microscopy (STM) and density functional theory (DFT) calculations and suggests that the potential minima directions occur for the rotating molecule at the six hollow sites surrounding the atop adsorption site.
Multiple coexisting intercalation structures of sodium in epitaxial graphene-SiC interfaces
- A. Sandin, T. Jayasekera, J. Rowe, K. W. Kim, M. Nardelli, D. Dougherty
- Materials Science
- 9 March 2012
This article discusses multiple coexisting intercalation structures of sodium in peitaxial graphene-SiC interfaces.
Local spectroscopy of image-potential-derived states: from single molecules to monolayers of benzene on Cu(111).
- D. Dougherty, P. Maksymovych, J. Lee, J. Yates
- Physics, ChemistryPhysical Review Letters
- 6 December 2006
Stark-shifted image-potential states were measured with an STM tip for benzene adsorbed on a Cu(111) surface because of local surface potential changes that are correlated with the lowering of the crystal work function due to adsorption of benzene.
Experimental persistence probability for fluctuating steps.
- D. Dougherty, I. Lyubinetsky, E. Williams, M. Constantin, C. Dasgupta, S. Das Sarma
- PhysicsPhysical Review Letters
- 4 September 2002
Numerical studies of the Langevin equation used to model step motion corroborate the experimental observations and are consistent with the value of theta=3/4 predicted for attachment-detachment limited step kinetics.
Molecular electronic level alignment at weakly coupled organic film/metal interfaces.
The analysis shows that the level alignment for C(6)F( 6) molecules bound through weak van der Waals interactions to noble metal surfaces is primarily defined by the image potential of metal, the electron affinity of the molecule, and the molecule surface distance.
Correlation time for step structural fluctuations
Time-dependent scanning tunneling microscopy has been used to evaluate step fluctuations as a function of temperature (300-450 K) on Ag(111) films grown on mica. The temporal correlation function…
Dynamics of domain boundaries at metal-organic interfaces.
It is found that the mean squared displacement of the boundary position grows linearly with time at early times but tends to saturate after about 7 s, ascribed to confined diffusion of the interface position based on fits and numerical integration of a Langevin equation for the interface motion.