The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

V. G. Pavlov - One of the best experts on this subject based on the ideXlab platform.

  • Field Desorption microscopy of graphene on iridium in intercalation with alkali metals
    Technical Physics Letters, 2014
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Field-Desorption and Field-emission electron microscopy methods have been used to study the effect of a strong electric Field on the processes of potassium and cesium Desorption from the graphene surface on an iridium Field emitter. It was found that two phases of Field Desorption may exist for these alkali metals. In the low-Field phase, alkali metal atoms adsorbed on the surface are desorbed. The existence of the high-Field phase is attributed to the egress from under the graphene film and ionization of intercalated alkali metal atoms under the action of the electric Field.

  • Field electron emission and Field Desorption of cesium from graphene
    Technical Physics, 2013
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Field electron emission and Field Desorption of cesium ions from a monatomic graphene film on Ir and graphene clusters in amorphous carbon are investigated using Field electron microscopy and continuous-mode Field Desorption microscopy. The deposition of cesium on amorphous carbon with graphite clusters leads to inversion of the emission (i.e., emission from the emission centers disappears against the back-ground of uniform emission from the previously nonemitting surface). In both systems, ion current pulses are observed during Field Desorption in a stationary electric Field. During Field Desorption from the graphene film, current pulses of Cs+ ions with a duration shorter than 0.1 s appear from the plane faces of the iridium point. During Desorption from graphite clusters, ion current pulses form a pattern of “collapsing rings” on the screen. Possible mechanisms of the observed processes are considered using the model of cesium intercalation by graphite and by the graphene layer and the Desorption of Cs atoms under the action of the electric Field, as well as the “flip” of the dipole moment during the cesium intercalation.

  • Ionic current pulses upon Field Desorption of cesium from graphene on iridium
    Technical Physics Letters, 2012
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Pulses of Cs^+ ion current upon Field Desorption in constant electric Field from an iridium point coated with a graphene film have been detected. Pulses with durations of less than 0.1 s were observed upon sputter deposition of cesium atoms onto graphene followed by their removal from the surface. During the pulse, one could observe a flash on the Field Desorption microscope display occupying all area of the images of {001} and {111} facets. Possible mechanisms of the flash formation using models of cesium intercalation in the graphene layer and the yield of cesium atoms from under the film under the action of the applied electric Field of the electric Field have been considered.

  • investigation of a solid surface using continuous mode Field Desorption microscopy
    Bulletin of The Russian Academy of Sciences: Physics, 2009
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Potentialities of continuous-mode Field-Desorption microscopy for studying the shape, structure, and composition of solid and film surfaces are considered and their transformation under different effects are analyzed. A number of objects that cannot be observed using other methods are revealed.

  • Field Desorption of a potassium-gold film on tungsten
    Physics of the Solid State, 2004
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    The formation and destruction of alloys and chemical compounds of gold with potassium occurring in their coadsorption on tungsten have been studied by continuous-mode Field-Desorption microscopy, Field-emission microscopy, and time-of-flight mass analysis of the products of Field-induced Desorption. The effect of an electric Field on these processes was investigated. Monatomic and cluster ions of potassium and its compounds with gold were found to appear in Fields too weak for Field Desorption to set in. Chemical reactions give rise to autooscillations in the Field Desorption of potassium.

N.d. Lang - One of the best experts on this subject based on the ideXlab platform.

Jürgen H. Gross - One of the best experts on this subject based on the ideXlab platform.

  • Field Ionization and Field Desorption
    Mass Spectrometry, 2017
    Co-Authors: Jürgen H. Gross
    Abstract:

    Ion formation by action of very strong electric Fields Desorption of ions into the gas phase by strong electric Fields Softness of Field ionization and Field Desorption Methods of sample introduction for Field ionization and Field Desorption General properties and Fields of application of the title methods Applications to air- and moisture-sensitive samples Complex mixture analysis by combining gas chromatography and high-resolution mass spectrometry with Field ionization and Field Desorption

  • liquid injection Field Desorption ionization of reactive transition metal complexes
    Analytical and Bioanalytical Chemistry, 2006
    Co-Authors: Jürgen H. Gross, Norbert Nieth, Bernhard H Linden, Ulrike Blumbach, Frank J Richter, Michael E Tauchert, Rolf Tompers, Peter Hofmann
    Abstract:

    Liquid injection Field Desorption/ionization (LIFDI) has been applied to identify transition metal complexes that are highly reactive to air and moisture by mass spectrometry. The complexes of nickel and rhodium were supplied as dilute solutions (∼0.2 mg ml−1) in toluene, tetrahydrofuran or acetonitrile, and were applied onto the Field Desorption emitter inside the vacuum of the ion source under inert conditions by means of the injection capillary unique to the LIFDI set-up. LIFDI mass spectrometry on a double-focusing magnetic sector instrument provided spectra exhibiting intense molecular ion peaks for the species investigated or signals that could easily be related to the target compound by assuming neutral loss of the weakest-bound ligand. Eventually, byproducts of the synthesis or other components resulting from incomplete reactions or some degree of decomposition were also detected.

P. R. Schwoebel - One of the best experts on this subject based on the ideXlab platform.

D.p. Bernatskii - One of the best experts on this subject based on the ideXlab platform.

  • Field Desorption microscopy of graphene on iridium in intercalation with alkali metals
    Technical Physics Letters, 2014
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Field-Desorption and Field-emission electron microscopy methods have been used to study the effect of a strong electric Field on the processes of potassium and cesium Desorption from the graphene surface on an iridium Field emitter. It was found that two phases of Field Desorption may exist for these alkali metals. In the low-Field phase, alkali metal atoms adsorbed on the surface are desorbed. The existence of the high-Field phase is attributed to the egress from under the graphene film and ionization of intercalated alkali metal atoms under the action of the electric Field.

  • Field electron emission and Field Desorption of cesium from graphene
    Technical Physics, 2013
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Field electron emission and Field Desorption of cesium ions from a monatomic graphene film on Ir and graphene clusters in amorphous carbon are investigated using Field electron microscopy and continuous-mode Field Desorption microscopy. The deposition of cesium on amorphous carbon with graphite clusters leads to inversion of the emission (i.e., emission from the emission centers disappears against the back-ground of uniform emission from the previously nonemitting surface). In both systems, ion current pulses are observed during Field Desorption in a stationary electric Field. During Field Desorption from the graphene film, current pulses of Cs+ ions with a duration shorter than 0.1 s appear from the plane faces of the iridium point. During Desorption from graphite clusters, ion current pulses form a pattern of “collapsing rings” on the screen. Possible mechanisms of the observed processes are considered using the model of cesium intercalation by graphite and by the graphene layer and the Desorption of Cs atoms under the action of the electric Field, as well as the “flip” of the dipole moment during the cesium intercalation.

  • Ionic current pulses upon Field Desorption of cesium from graphene on iridium
    Technical Physics Letters, 2012
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Pulses of Cs^+ ion current upon Field Desorption in constant electric Field from an iridium point coated with a graphene film have been detected. Pulses with durations of less than 0.1 s were observed upon sputter deposition of cesium atoms onto graphene followed by their removal from the surface. During the pulse, one could observe a flash on the Field Desorption microscope display occupying all area of the images of {001} and {111} facets. Possible mechanisms of the flash formation using models of cesium intercalation in the graphene layer and the yield of cesium atoms from under the film under the action of the applied electric Field of the electric Field have been considered.

  • investigation of a solid surface using continuous mode Field Desorption microscopy
    Bulletin of The Russian Academy of Sciences: Physics, 2009
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    Potentialities of continuous-mode Field-Desorption microscopy for studying the shape, structure, and composition of solid and film surfaces are considered and their transformation under different effects are analyzed. A number of objects that cannot be observed using other methods are revealed.

  • Field Desorption of a potassium-gold film on tungsten
    Physics of the Solid State, 2004
    Co-Authors: D.p. Bernatskii, V. G. Pavlov
    Abstract:

    The formation and destruction of alloys and chemical compounds of gold with potassium occurring in their coadsorption on tungsten have been studied by continuous-mode Field-Desorption microscopy, Field-emission microscopy, and time-of-flight mass analysis of the products of Field-induced Desorption. The effect of an electric Field on these processes was investigated. Monatomic and cluster ions of potassium and its compounds with gold were found to appear in Fields too weak for Field Desorption to set in. Chemical reactions give rise to autooscillations in the Field Desorption of potassium.