H. J. Kreuzer

Tyrolean Cancer Research Institute

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Zbigniew W. Gortel

University of Alberta

S.H. Payne

Dalhousie University

M. H. Jericho

Dalhousie University

R. L. C. Wang

Wuhan Institute of Technology

R. Teshima

University of Alberta

Wenbo Xu

Henan Provincial People's Hospital

M. Grunze

Max Planck Institute for Medical Research

Martin Okrusch

University of Würzburg

Eberhard Seidel

University of Cologne

Markus Karahka

Dalhousie University

Cooperative Institutions

Dalhousie University

Technical University of Munich

University of Göttingen

Universitätsmedizin Göttingen

Heidelberg University

Innsbruck Medical University

Universität Innsbruck

Ludwig-Maximilians-Universität München

University of Basel

Federal Institute for Geosciences and Natural Resources

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Mechanism of C2H4 dehydrogenation to C2H2 on the Ni(111) surface

Chemical Physics Letters (1996)

Mimi E. Lam Russell J. Boyd H. J. Kreuzer

Acetylene

Potential energy surface

Fragmentation

10.1016/0009-2614(96)00214-x

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Citations (3)

Digital in-line holography with numerical reconstruction: 4D tracking of microstructures and organisms

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2003)

H. J. Kreuzer M. H. Jericho Ian A. Meinertzhagen Wenbo Xu

Using holographic microscopy we have been able to visualize submicron-sized. bacteria in-vivo. A simple holographic method enables us to capture as a single data set the trajectories of micron size objects suspended in water. By subtracting consecutive holograms of a particle suspension and then adding these difference holograms, a final data set is constructed that contains the time evolution of the particle trajectories free from spurious background interference effects. Temporal and spatial resolution at the sub-second and sub-micron levels can easily be achieved. The method is illustrated by recording the motion in 3-D of 5μm diameter latex spheres subject to gravity and electrostatic fields to visualize their micro-fluidic flow. Another example is the 3-D motion of a collection of algae, protozoa and bacteria in water.

Digital holography

Tracking (education)

Particle (ecology)

Digital Holographic Microscopy

Spurious relationship

Suspension

10.1117/12.476875

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Citations (6)

Missing row formation induced by unidirectional field evaporation of hydrogen-covered Rh{1 1 0}

Surface Science (2002)

Thierry Visart de Bocarmé T. Bär Norbert Kruse H. J. Kreuzer

Field ion microscope

Atom probe

10.1016/s0039-6028(02)01497-8

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Citations (3)

Nonequilibrium thermodynamics of a two-phase adsorbate: Lattice gas and van der Waals models

Surface Science (1988)

S.H. Payne H. J. Kreuzer

Isothermal process

Lattice (music)

10.1016/0039-6028(88)90169-0

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Citations (67)

Desorption by phonon cascades for gas-solid systems with many physisorbed surface bound states

Physical review. B, Condensed matter (1980)

Zbigniew W. Gortel H. J. Kreuzer R. Teshima

We give the extension of our quantum-statistical theory of desorption for systems with many physisorbed bound states in the surface potential. Rate equations are set up and the desorption time ${t}_{d}$ is properly identified as the smallest eigenvalue of the matrix of transition probabilities. The latter are calculated exactly in second-order perturbation theory for a surface Morse potential. We show that desorption in weakly coupled systems with many bound states proceeds predominantly through one-phonon cascades. Two-phonon contributions are shown to be small. Desorption times are calculated for the He-LiF, He-NaF, He-graphite, H-NaCl, He-Ar, and Xe-W systems. The temperature regime over which a Frenkel-Arrhenius parametrization ${t}_{d}={t}_{d}^{0}\mathrm{exp}(\frac{Q}{{k}_{B}T})$ can be invoked is given. Our theory which is essentially parameter-free produces prefactors ${t}_{d}^{0}$ in the whole experimental range of physisorption from ${10}^{\ensuremath{-}7}$ to ${10}^{\ensuremath{-}14}$ sec.

Physisorption

Morse potential

10.1103/physrevb.22.5655

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Citations (87)

Nonequilibrium Phenomena in Electron Tunneling in Normal Metal-Insulator-Metal Junctions

Physical Review Letters (1972)

P. N. Trofimenkoff H. J. Kreuzer W. J. Wattamaniuk J. G. Adler

Structure in the conductance of normal metal-insulator-metal junctions at very low bias is explained through a nonequilibrium treatment of the tunneling process. In particular, the related peak in the derivative $\frac{d\ensuremath{\sigma}(V)}{\mathrm{dV}}$ is quantitatively accounted for by the blocking of otherwise available electron tunneling states due to the finite electron relaxation rates in the metal electrodes.

Coulomb blockade

Metal-insulator-metal

10.1103/physrevlett.29.597

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Citations (18)

Metoclopramide (MCP): Indirect parasympathomimetic activity by reversible inhibition of human acetylcholinesterase

Pharmacological Research (1995)

Jörg-Michael Chemnitius K.H. Haselmeyer H. J. Kreuzer Ronald Zech

Metoclopramide

10.1016/1043-6618(95)86309-5

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Citations (0)

Resonant heating in photodesorption via laser-adsorbate coupling

Physical review. B, Condensed matter (1983)

Zbigniew W. Gortel H. J. Kreuzer P. Piercy R. Teshima

Based on the master equation for photodesorption of molecules by resonant laser-molecular vibrational coupling and on the equation of heat conduction, we calculate the heating of the solid through transfer of laser energy resonantly absorbed in the internal vibration of the adsorbed molecule. For the system C${\mathrm{H}}_{3}$F on NaCl we find that for large laser intensity resonant heating can raise the surface temperature by some 30% for realistic surface-potential parameters. The desorption time, being mainly laser induced and not thermal, changes only by at most a factor of 2-3 as a result of resonant heating.

10.1103/physrevb.28.2119

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Citations (66)

Holography of holes, with electrons and photons

Journal of Microscopy (1995)

H. J. Kreuzer Hans‐Werner Fink Heinz Schmid Stanimir Bonev

SUMMARY Submicrometre holes in a gold film are illuminated with coherent low‐energy electrons in the low‐energy electron point‐source microscope. The images are interpreted as holograms and simulated using the Fresnel‐Kirchhoff formula. A reconstruction scheme yields the wave front at the object, in good agreement with transmission electron microscope images of the same hole structures. Laser experiments of similarly shaped, but scaled appropriately, hole structures reveal the same features.

Electron holography

Fresnel zone

Zone plate

10.1111/j.1365-2818.1995.tb03597.x

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Citations (24)

Quantum statistical theory of flash desorption

The Journal of Chemical Physics (1980)

Zbigniew W. Gortel H. J. Kreuzer D. Spaner

The nonequilibrium initial value problem of phonon-mediated flash desorption of a gas from a solid surface is formulated explicitly and flash desorption times td=td(Tg, Ts) are calculated, using a nonlocal separable surface potential, as a function of both initial and final temperatures Tg and Ts, respectively. We find that for fixed Tg, td can be approximated by Frenkel’s formula over a limited range of flash temperatures Ts. We fit our theory to flash desorption data for He desorbing from Constantan and find excellent agreement. Predictions on 4He (H or D) desorbing from LiF (NaF) are given. Our theory is formulated both in one and three dimensions and it is shown by numerical examples that the theory of flash desorption works equally well in either case.

10.1063/1.438882

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Citations (61)