Fringe Structure in the Phase-Space Dynamics of Atomic Stabilization in An Intense FieldAn analytical expression of a Floquet operator, which describes the evolution of a wave packet in combined atomic and an intense laser field,is obtained approximately in the stabilization regime.…Jie liu, Si-gang Chen, Baowen Li et al.·Jul 12, 2002SaveLearn
Enhanced ionization in small rare gas clustersA detailed theoretical investigation of rare gas atom clusters under intense short laser pulses reveals that the mechanism of energy absorption is akin to enhanced ionization first discovered…Christian Siedschlag, Jan-Michael Rost·Jul 2, 2002SaveLearn
Ionization of clusters in strong X-ray laser pulsesThe effect of intense X-ray laser interaction on argon clusters is studied theoretically with a mixed quantum/classical approach. In comparison to a single atom we find that ionization of the cluster…Ulf Saalmann, Jan M Rost·Jun 21, 2002SaveLearn
Electron release of rare gas atom clusters under an intense laser pulseCalculating the energy absorption of atomic clusters as a function of the laser pulse length T we find a maximum for a critical T*. We show that T* can be linked to an optimal cluster radius…Christian Siedschlag, Jan M. Rost·Jun 19, 2002SaveLearn
Ultra-low energy elastic scattering in a system of three He atomsDifferential Faddeev equations in total angular momentum representation are used for the first time to investigate ultra-low energy elastic scattering of a helium atom on a helium dimer. Six…V. A. Roudnev·Jun 17, 2002SaveLearn
Intense pulsed helium droplet beamsPulsed (30 - 100 microseconds) nozzle beams have been used to generate helium droplets (<N> = 104-105). The dependence of the beam intensity and the mean droplet size on the source stagnation…Mikhail N. Slipchenko, Susumu Kuma, Takamasa Momose et al.·Jun 13, 2002SaveLearn
Structure and spectroscopy of doped helium clusters using quantum Monte Carlo techniquesWe present a comparative study of the rotational characteristics of various molecule-doped 4He clusters using quantum Monte Carlo techniques. The theoretical conclusions obtained from both zero and…Alexandra Viel, K. Birgitta Whaley·Jun 10, 2002SaveLearn
Effects of Defects on the Strength of Nanotubes: Experimental-Computational ComparisonsThe failure stresses and strains of nanotubes given by theoretical or numerical predictions are much higher than observed in experiments. We show that defects can explain part of this discrepancy:…T. Belytschko, S. P. Xiao, R. Ruoff·May 30, 2002SaveLearn
Formation of an Icosahedral Structure during the Freezing of Gold Nanoclusters: Surface-Induced MechanismThe freezing behavior of gold nanoclusters was studied by employing molecular dynamics simulations based on a semi-empirical embedded-atom method. Investigations of the gold nanoclusters revealed…H. -S. Nam, Nong M. Hwang, B. D. Yu et al.·May 9, 2002SaveLearn
Giant Magnetic Moments of Nitrogen Stabilized Mn Clusters and Their Relevance to Ferromagnetism in Mn Doped GaNUsing first principles calculations based on density functional theory, we show that the stability and magnetic properties of small Mn clusters can be fundamentally altered by the presence of…B. K. Rao, P. Jena·Apr 22, 2002SaveLearn
Atomistic Simulations of Nanotube FractureThe fracture of carbon nanotubes is studied by atomistic simulations. The fracture behavior is found to be almost independent of the separation energy and to depend primarily on the inflection point…T. Belytschko, S. P. Xiao, G. C. Schatz et al.·Mar 27, 2002SaveLearn
Chirality in Bare and Passivated Gold NanoclustersChiral structures have been found as the lowest-energy isomers of bare (Au28 and Au55) and thiol-passivated (Au28(SCH3)16 and Au38(SCH3)24) gold nanoclusters. The…I. L. Garzon, J. A. Reyes-Nava, J. I. Rodriguea-Hernandez et al.·Mar 26, 2002SaveLearn
Charge Dependence of Temperature-Driven Phase Transitions of Molecular Nanoclusters: Molecular Dynamics SimulationPhase transitions (liquid-solid, solid-solid) triggered by temperature changes are studied in free nanosized clusters of TeF6 (SF6) with different negative charges assigned to the fluorine atoms.…S. Pisov, A. Proykova·Mar 18, 2002SaveLearn
Scissors modes in triaxial metal clustersWe study the scissors mode (orbital M1 excitations) in small Na clusters, triaxial metal clusters Na12 and Na16 and the close-to-spherical Na9+, all described in DFT…P. -G. Reinhard, V. O. Nesterenko, E. Suraud et al.·Mar 7, 2002SaveLearn
Formalism for Multiphoton Plasmon Excitation in Jellium ClustersWe present a new formalism for the description of multiphoton plasmon excitation processes in jellium clusters. By using our method, we demonstrate that, in addition to dipole plasmon excitations,…Jean-Patrick Connerade, Andrey V Solov'yov·Feb 27, 2002SaveLearn
Laser Spinning of Nanotubes: A path to fast-rotating microdevicesWe show that circularly polarized light can spin nanotubes with GHz frequencies. In this method, angular moments of infrared photons are resonantly transferred to nanotube phonons and passed to the…Petr Král, H. R. Sadeghpour·Feb 19, 2002SaveLearn
Ga-rich GaAs(001) surfaces observed during high-temperature annealing by scanning tunneling microscopyGa-rich GaAs (001) surfaces are successfully observed during high-temperature annealing by scanning tunneling microscopy (STM). With a substrate temperature of 550 C, reflection high-energy…Shiro Tsukamoto, Markus Pristovsek, Bradford G. Orr et al.·Jan 30, 2002SaveLearn
Origin of anomalously long interatomic distances in suspended gold chainsThe discovery of long bonds in gold atom chains has represented a challenge for physical interpretation. In fact, interatomic distances frequently attain 3.0-3.6 A values and, distances as large as…Sergio B. Legoas, Douglas S. Galvao, Varlei Rodrigues et al.·Jan 7, 2002SaveLearn
Novel structures of Co-Cu bimetallic clusters and their magnetic propertiesThe structural and magnetic properties of Co18-mCum (0≤ m≤ 18) clusters are investigated with a genetic algorithm and a spd-band model Hamiltonian in the unrestricted Hartree-Hock…Jinlan Wang, Guanghou Wang, Xiaoshuang Chen et al.·Dec 21, 2001SaveLearn
Polarizabilities of germanium clustersPolarizabilities of Gen clusters with 2 to 25 atoms are calculated using coupled-perturbation Hartree-Fock (CPHF) and finite field (FF) method within density functional theory. The…Jinlan Wang, Mingli Yang, Guanghou Wang et al.·Dec 20, 2001SaveLearn
Ground state and excitation dynamics in Ag doped helium clustersWe present a quantum Monte Carlo study of the structure and energetics of silver doped helium clusters AgHen for n up to 100. Our simulations show the first solvation shell of the Ag atom to be…Massimo Mella, Maria Carola Colombo, Gabriele Morosi·Dec 19, 2001SaveLearn
Density functional study of Aun (n=2-20) clusters: lowest-energy structures and electronic propertiesWe have investigated the lowest-energy structures and electronic properties of the Aun(n=2-20) clusters based on density functional theory (DFT) with local density approximation. The small Aun…Jinlan Wang, Guanghou Wang, Jijun Zhao·Dec 18, 2001SaveLearn
Mass spectrometric and first principles study of AlnC- clustersWe study the carbon-dope aluminum clusters by using time-of-flight mass spectrum experiments and ab initio calculations. Mass abundance distributions are obtained for anionic aluminum and…Jijun Zhao, Bingchen Liu, Huajin Zhai et al.·Dec 18, 2001SaveLearn
Structure and properties of small sodium clustersWe have investigated structure and properties of small metal clusters using all-electron ab initio theoretical methods based on the Hartree-Fock approximation and density functional theory,…Ilia A. Solov'yov, Andrey V. Solov'yov, Walter Greiner·Dec 13, 2001SaveLearn
Fragmentation of positively charged metal clusters in stabilized jellium model with self-compressionUsing the stabilized jellium model with self-compression, we have calculated the dissociation energies and the barrier heights for the binary fragmentation of charged silver clusters. At each step of…M. Payami·Dec 10, 2001SaveLearn