EVALUATING COUPLING OF ADSORBED MOLECULES TO THEIR ENVIRONMENT IN SCANNING TUNNELING MICROSCOPY

2010 ◽  
Vol 17 (05n06) ◽  
pp. 441-444
Author(s):  
M. A. GRADO-CAFFARO ◽  
M. GRADO-CAFFARO
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Interaction Energy ◽  
Theoretical Approach ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Coupling Energy ◽  
Adsorbed Molecules ◽  
Morse Oscillators

We present a new theoretical approach to determine the interaction energy due to the coupling of adsorbed molecules to their environment in scanning tunneling microscopy. In fact, the above coupling energy is estimated by assuming the involved adsorbed molecules as Morse oscillators and their environment (electrodes, leads) as external reservoir.

The Chemisorption of C on Al(111)

1998 ◽  
Vol 05 (02) ◽  
pp. 537-543
Author(s):  
E. E. Mola ◽  
G. A. Appignanesi ◽  
J. L. Vicente
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Interaction Energy ◽  
Adsorption Site ◽  
Mndo Method ◽  
Scanning Tunneling ◽  
Surface Site ◽  
Tunneling Microscopy ◽  
Semiempirical Mndo

The chemisorption of C atoms on Al(111) was studied by means of the semiempirical MNDO method. The incorporation of the C adatom into the clusters was considered and the most favorable chemisorption site was evaluated. The hcp in-surface site was identified as the most stable adsorption site, in agreement with recent scanning tunneling microscopy (STM) experiments. This fact allowed us to use the MNDO method to evaluate the interaction energy of two chemisorbed C atoms in order to understand the observed formation of an ordered carbon underlayer. The low mobility of single isolated C adatoms revealed in STM experiments is also discussed.

scholarly journals Deuteration of C60 on a highly oriented pyrolytic graphite surface

2019 ◽  
Vol 15 (S350) ◽  
pp. 458-459
Author(s):  
G. Pantazidis ◽  
M. Scheffler ◽  
F. D. S. Simonsen ◽  
A. Cassidy ◽  
P. A. Jensen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Interstellar Medium ◽  
Scanning Tunneling Microscopy ◽  
Pyrolytic Graphite ◽  
Graphite Surface ◽  
Scanning Tunneling ◽  
Highly Oriented Pyrolytic Graphite ◽  
Tunneling Microscopy ◽  
Adsorbed Molecules ◽  
Thermal Stability Of

AbstractReactions on carbonaceous surfaces play an important role in processes such as H2 formation in the interstellar medium. We have investigated the adsorption of C2 molecules on a highly oriented pyrolytic graphite (HOPG) surface and then exposed them to a beam of deuterium atoms in order to investigate the formation of deuterated fullerenes. Scanning tunneling microscopy (STM) was used to probe the adsorbed molecules and their deuteration. Deuteration of C2 films results in increased thermal stability of the film, relative to films of pristine C2, along with an evolution towards higher deuterated species. The STM data provide confirmatory evidence for the formation of deuterated fullerene species.

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