Electronic excitation of ice monomers on Au(111) by scanning tunneling microscopy

Gawronski, Heiko; Morgenstern, Karina; Rieder, Karl–Heinz

doi:10.1140/epjd/e2005-00224-4

Cited by 52 publications

(52 citation statements)

References 16 publications

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“…At this specific binding site the molecule is bound sufficiently to take vibrational spectra in the range up to 75 mV (Fig. b) . The IET spectrum reveals a multiple peak in the region between 10 and 50 meV, which is best fitted by a triple Gaussian.…”

Section: Spectroscopy With the Stmmentioning

confidence: 99%

Controlled manipulation of single atoms and small molecules using the scanning tunnelling microscope

Morgenstern

Lorente

Rieder

2013

Phys. Status Solidi B

101

108

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This article reviews manipulation of single molecules by scanning tunnelling microscopes, in particular vertical manipulation, lateral manipulation, and inelastic electron tunnelling (IET) manipulation. For a better understanding of these processes, we shortly review imaging by scanning tunnelling microscopy – as a prerequisite to detect the manipulated species and to verify the result of the manipulation – as well as scanning tunnelling spectroscopy and IET spectroscopy which are used to chemically identify the molecules before and after the manipulation that employs the tunnelling current.

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Section: Spectroscopy With the Stmmentioning

confidence: 99%

Controlled manipulation of single atoms and small molecules using the scanning tunnelling microscope

Morgenstern

Lorente

Rieder

2013

Phys. Status Solidi B

101

108

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“…Since then, many papers on IETS and the inelastic electron induced dynamics of molecules have been reported for single molecules on metal surfaces [58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. For example, the C-H stretching signal was preferentially detected for an acetylene molecule on a Cu(100) surface, where the spatial distribution of the IET signal was found to be localized near the molecule [70].…”

Section: Inelastic Electron Tunneling Spectroscopymentioning

confidence: 99%

Inelastic electron tunneling process for alkanethiol self-assembled monolayers

Okabayashi

Paulsson

Komeda

2013

Progress in Surface Science

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Recent investigations of inelastic electron tunneling spectroscopy (IETS) for alkanethiol self-assembled monolayers (SAMs) are reviewed. Alkanethiol SAMs are usually prepared by immersing a gold substrate into a solution of alkanethiol molecules, and they are very stable, even under ambient conditions. Thus, alkanethiol SAMs have been used as typical molecules for research into molecular electronics. Infrared spectroscopy and electron energy loss spectroscopy (EELS) have frequently been employed to characterize SAMs on the macroscopic scale. For characterization of alkanethiol SAMs on the nanometer scale region, or for single alkanethiol molecules through which electrons actually tunnel, IETS has proven to be an effective method. However, IETS experiments for alkanethiol SAMs employing different methods have shown large differences, i.e., there is a lack of standard data for alkanethiol SAMs with which to understand the IET process or to satisfactorily compare with theoretical investigations.An effective means of acquiring standard data is the formation of a tunneling junction with scanning tunneling microscopy (STM). After explanation of the STM experimental techniques, standard IETS data are presented whereby a contact condition between the tip and SAM is tuned. We have found that many vibrational modes are detected by STM-IETS, as is also the case for EELS. These results are compared with IET spectra measured with different tunneling junctions. In order to precisely investigate which vibrational modes are active in IETS, isotope labeling of alkanethiols with specifically synthesized isotopically substituted molecule has been examined. This method provides unambiguous assignments of IET spectra peaks and site selectivity for alkanethiol SAMs such that all parts of the alkanethiol molecules almost equally contribute to the IET process. The IET process is also discussed based on density functional theory and nonequilibrium Green's function calculations. These results quantitatively reproduce many the experimentally observed features, whereas Fermi's golden rule for IETS qualitatively explains the propensity rule and site selectivity observed in the experiments. However, comparison between experiment and theory reveals a large difference in IETS intensity for the C-H stretching mode that originates from the side chains of the alkanethiol molecules. In order to explain this difference, we discuss the importance of an intermolecular tunneling process in the SAM. Application of STM-IETS to identify a hydrogenated alkanethiol molecule inserted into a deuterated alkanethiol SAM matrix is also demonstrated.

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“…11 In general, on hexagonal metal surfaces, water forms hydrogen-bonded clusters that consist of buckled hexamers. [12][13][14][15][16][17] The importance of hydrogen bonding in the structures of H 2 O aggregates on Ag͑111͒ has been confirmed by detailed scanning tunneling microscopy ͑STM͒ and DFT studies of Morgenstern, Michaelides et al [15][16][17][18][19][20][21][22][23][24][25][26] Like H 2 O, H 2 S forms H bonds in the gas, liquid, and solid states. However, its H bond is only about half as strong as that of H 2 O, 27 and its internal molecular geometry is considerably different: The S-H bond is longer than the O-H bond ͑0.133 nm vs. 0.095 nm͒, and its internal bond angle is smaller ͑92.2°versus 104.5°͒.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature adsorption of H2S on Ag(111)

Russell

Liu

Kawai

et al. 2010

The Journal of Chemical Physics

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H 2 S forms a rich variety of structures on Ag(111) at low temperature and submonolayer coverage. The molecules decorate step edges, exist as isolated entities on terraces, and aggregate into clusters and islands, under various conditions. One type of island exhibits a (×)R25.3° unit cell. Typically, molecules in the clusters and islands are separated by about 0.4 nm, the same as the S-S separation in crystalline H 2 S. Density functional theory indicates that hydrogen-bonded clusters contain two types of molecules. One is very similar to an isolated adsorbed H 2 S molecule, with both S-H bonds nearly parallel to the surface. The other has a S-H bond pointed toward the surface. The potential energy surface for adsorption and diffusion is very smooth. KeywordsAmes Laboratory, adsorption, density functional theory, diffusion, hydrogen bonds, intermolecular forces, island structure, molecular clusters, potential energy surfaces, silver, sulphur compounds H 2 S forms a rich variety of structures on Ag͑111͒ at low temperature and submonolayer coverage. The molecules decorate step edges, exist as isolated entities on terraces, and aggregate into clusters and islands, under various conditions. One type of island exhibits a ͑ ͱ 37ϫ ͱ 37͒R25.3°unit cell.Typically, molecules in the clusters and islands are separated by about 0.4 nm, the same as the S-S separation in crystalline H 2 S. Density functional theory indicates that hydrogen-bonded clusters contain two types of molecules. One is very similar to an isolated adsorbed H 2 S molecule, with both S-H bonds nearly parallel to the surface. The other has a S-H bond pointed toward the surface. The potential energy surface for adsorption and diffusion is very smooth.

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Electronic excitation of ice monomers on Au(111) by scanning tunneling microscopy

Cited by 52 publications

References 16 publications

Controlled manipulation of single atoms and small molecules using the scanning tunnelling microscope

Controlled manipulation of single atoms and small molecules using the scanning tunnelling microscope

Inelastic electron tunneling process for alkanethiol self-assembled monolayers

Low-temperature adsorption of H2S on Ag(111)

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