Self-Assembly of Graphene Nanoblisters Sealed to a Bare Metal Surface.
Nano Letters 16(3):1808 (2016)
The possibility to intercalate noble gas atoms below epitaxial graphene monolayers coupled with the instability at high temperature of graphene on the surface of certain metals has been exploited to produce Ar-filled graphene nanosized blisters evenly distributed on the bare Ni(111) surface. We ...
Ultrafast charge transfer at monolayer graphene surfaces with varied substrate coupling.
ACS Nano 7(5):4359 (2013)
The charge transfer rates of a localized excited electron to graphene monolayers with variable substrate coupling have been investigated by the core hole clock method with adsorbed argon. Expressed as charge transfer times, we find strong variations between ~3 fs (on graphene "valleys" on Ru(000...
Electronically induced surface reactions: evolution, concepts, and perspectives.
Journal of Chemical Physics 137(9):091702 (2012)
This is a personal account of the development of the title subject which is the broader field encompassing surface photochemistry. It describes the early times when the main interest centered on desorption induced by slow electrons, follows its evolution in experiment (use of synchrotron radiati...
Comparative study of thermal and photo-induced reactions of NO on particulate and flat silver surfaces
Surface Science 606(15-16):1142 (2012)
Adsorption states, thermal reactions, and photoreactions at photon energies 2.3–4.7eV of NO dimers and monomers have been compared between 8-nm silver nanoparticles (Ag NPs) formed on an Al2O3/NiAl(110) substrate and flat Ag(111) surfaces, by thermal desorption (TPD) and by photodesorp...
Enhanced photoinduced desorption from metal nanoparticles by photoexcitation of confined hot electrons using femtosecond laser pulses.
Physical Review Letters 107(4):047401 (2011)
Strong fluence dependence of photodesorption cross sections is observed in femtosecond laser photodesorption of NO from (NO)2 on silver nanoparticles, in contrast to femtosecond photodesorption on bulk metals. The time scale of excitation buildup is found to be equal or less than the pulse durat...
State-resolved investigation of the photodesorption dynamics of NO from (NO)2 on Ag nanoparticles of various sizes in comparison with Ag(111).
Journal of Chemical Physics 134(16):164702 (2011)
The translational and internal state energy distributions of NO desorbed by laser light (2.3, 3.5, and 4.7 eV) from adsorbed (NO)(2) on Ag nanoparticles (NPs) (mean diameters, D = 4, 8, and 11 nm) have been investigated by the (1 + 1) resonance enhanced multiphoton ionization technique. For comp...
UV photo-dissociation and photodesorption of N2O on Ag(111).
Journal of Physics, Condensed Matter 22(8):084012 (2010)
Nanosecond laser induced photoreactions of N2O adsorbed on Ag(111) have been studied by temperature programmed desorption (TPD) and mass-selected, angle-dependent time-of-flight (MS-TOF) measurements of neutral desorbing particles. N2O molecules in the first monolayer are thermally inert but pho...
Photoinduced abstraction reactions within NO dimers on Ag(111).
Journal of the American Chemical Society 131(5):1660 (2009)
Nanosecond laser-induced photoreactions of (NO)(2) adsorbed on Ag(111) at 75 K are investigated by mass-selected photoinduced desorption (PID) and time-of-flight (TOF) measurements. It has been found that N(2) as well as N(2)O is formed by a photoinduced abstraction reaction within a single (NO)...
The geometries of coadsorbate layers of O and H on Ru(0 0 1): How well can quantitative LEED see hydrogen atoms?
Surface Science 603(10):1397 (2009)
Using a CCD LEED system for the collection of IV data with low beam damage, and full dynamical as well as tensor LEED calculations, we have determined the geometries of the (2
3H) and the (2
H) coadsorbate structures on Ru(...
Size effects in thermal and photochemistry of (NO)2 on Ag nanoparticles.
Physical Review Letters 101(14):146103 (2008)
NO dimers adsorbed on alumina supported silver nanoparticles (Ag NPs, radii R approximately 1-6 nm) show decreasing desorption temperatures and complex behavior of photoinduced desorption with decreasing NP size. In particular, for resonant excitation of the (1,0) Mie plasmon at 3.5 eV the photo...
Ultrafast charge transfer at surfaces accessed by core electron spectroscopies.
Chemical Society Reviews 37(10):2212 (2008)
Charge transfer at surfaces, which is very important for surface photochemistry and other processes, can be extremely fast. This tutorial review shows how high resolution correlated excitation/decay spectroscopies of core excitations can be used to obtain charge transfer times at surfaces around...
Hyperthermal chaotic photodesorption of xenon from alumina-supported silver nanoparticles: plasmonic coupling and plasmon-induced desorption.
Physical Review Letters 99(22):225501 (2007)
Excitation of Xe monolayers on alumina-supported silver nanoparticles (AgNPs) by laser light in the (1,0) Mie plasmon resonance can lead to desorption of Xe atoms with hyperthermal energy and chaotic time structure. The chaotic behavior is most likely due to plasmonic coupling between AgNPs. We ...
Photochemistry on metal nanoparticles.
Chemical Reviews 106(10):4301 (2006)
Two-photon photoemission from silver nanoparticles on thin alumina films: Role of plasmon excitation
Surface Science 593(1):43 (2005)
Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al
3 film on NiAl(1
0) has been investigated using femtosecond lasers. The 2PPE spectra show a feature similar to the surface state of Ag(1
1). The total 2PPE yield possesses a max...
Surface science. Water on a metal surface.
Science 295(5552):58 (2002)
A systematic investigation of the geometrical structures of four oxygen/nitric oxide coadsorbate layers on Ru(001)
Surface Science 419(2):272 (1999)
IV analysis has been used to determine the detailed geometries of four well-defined ordered coadsorbate structures which can be formed by the interaction of NO with (2×1)-O and (2×2)-O layers on Ru(001), and which have been characterized previously by various surface spectroscop...
The(2 CO + O)(2 × 2) Ru(001)layer: preparation, characterization, and analysis of interaction effects in vibrational spectra
Surface Science 389(1):116 (1997)
The coadsorption system
has been investigated using TDS, IRAS, LEED and XPS. Our work goes beyond preceding investigations in that we show that it is possible to accommodate two CO ...
Structural evidence for chemical contributions in the bonding of the heavy rare gases on a close-packed transition metal surface: Xe and Kr on Ru(001)
Chemical Physics Letters 270(1):163 (1997)
We have determined the geometries of two ordered structures of Xe and Kr on Ru(001) by LEED-IV analysis, of the (√3 × √3)R30
0-Xe and the close-packed (3 × 3)-Kr structures. The Xe atoms sit on-top, with unexpectedly short XeRu distance. In the Kr structure the adatom layer locks int...
The influence of electronegative coadsorbates on the geometry of benzene on Ru(001)
Surface Science 384(1):179 (1997)
The geometrical structures of the Ru(001)-p(3 × 3)-C
6 + 2O and Ru(001)-p(3 × 3)-C
6 + 2NO coadsorbate layers have been determined by a detailed LEED
IV analysis. The benzene molecule as well as the coadsorbates are found to be bound on hcp sites. The mo...
The geometry of the saturated (2 × 2)-NO adlayer on Ru(001): a structure with three different sites
Surface Science 391(1):47 (1997)
The geometry of the ordered (2 × 2)-3NO structure formed on Ru(001) at saturation has been studied by a detailed LEED-
IV analysis. NO is found to adsorb on three different adsorption sites, NO
hcp, and NO
fcc, in upright orientation with the N end down. NO