Dr James Evans

James Evans
	Professor Department of Mathematics 438 Carver Hall Chemist Ames Laboratory - USDOE 315 Wilhelm Hall Iowa State University Ames, IA 50011 Telephone: (515)-294-1638 Fax: (515)-294-0266 E-mail: evans@ameslab.gov See also: http://www.fi.ameslab.gov/PIINFO/evans.htm

Research Interests

Non-linear dynamics, chemical diffusion, pattern formation, and fluctuations in catalytic surface reactions atomistic lattice-gas modeling; development and analysis of reaction-diffusion equations.
Growth and relaxation of nanostructures in epitaxial thin films nucleation and growth of two-dimensional islands; kinetic roughening during multilayer deposition; post-deposition equilibration processes.
Statistical Mechanics of Far-From-Equilibrium Processes.

Current Research Grants:

"Nanostructure Formation and Evolution in Thin Films", NSF Grant CHE-0058596, from 8/2000-7/2003 for $555,969. PI J.W. Evans; Co-PI P.A. Thiel. (A continuation of previous NSF grants from 1990-1999 for ~$1.3M).
"Modeling of Spatiotemporal Behavior in Surface Reactions", USDOE Basic Energy Sciences through Ames Laboratory for ~$100,000 per annum. PI J.W. Evans.
"Evolution of Nanoscale Film Morphology", NSF Engineering Division SGI on "Nanoscale Modeling and Simulation" from 2000-2003 for ~$1M with $235,000 subcontract for Evans. PI's T.S. Rahman, T.L. Einstein, J.W. Evans, K. Fichthorn.
USDOE SciDAC Project in Chemical Physics from 2001-2003 for $250,000 per annum. PI: M.S. Gordan; co-PI's: J.W. Evans, K. Ruedenberg.
NSF REU (Research Experiences for Undergraduates) on "Computational Materials Science" from 2002-2004 for $144,000. PI: M.S. Gordan; co-PI's: J.W. Evans and five others.

Current Research Group:

Da-Jiang Liu (P&S Staff Scientist), Ph.D. University of Maryland, 1998.
Maozhi Li (postdoc), Ph.D, CAS Bejing, 2001.
Marvin Albao (Ph.D. student, Physics)

Previous Group Members:

Kyle Caspersen (Chem Ph.D. 2001) Postdoc, Materials Sci., UCLA/Caltech.
Edna James (Math Ph.D 1999) Postdoc, Mathematics, U. Saskatoon, Canada.
Antonio Cadilhe (Postdoc 1997-99). Visiting Fellow, Physics, U. Minho, Portugal.
Mike Tammaro (Physics Ph.D 1997). Lecturer, Physics, U. Rhode Island.
Maria Bartelt (Postdoc 1991-96). Scientist, Sandia National Laboratories.
Chris Westermeyer (Math M.Sc. 1995). Actuary. .
Tim Ray (Math Ph.D. 1994). Assoc. Prof. of Mathematics, S.E. Missouri State.
Chuan Kang (Postdoc, 1989-90), Senior Lecturer, Chemistry, Singapore National U.
K.J. Caspersen, (Chem Ph.D. 2001) Postdoc, Materials Sci., UCLA/Caltech

Recent Journal Publications on Thin Films (1998-onward):

L. Bardotti, M.C. Bartelt, C.J. Jenks, C.R. Stoldt, J.-M. Wen, C.-M. Zhang, P.A. Thiel, and J.W. Evans, "Formation and Equilibration of Submonolayer Island Distributions in Ag/Ag(100) Homoepitaxy", Langmuir, 14, 1478-1486 (1998).
L. Bardotti, C.R. Stoldt, C.J. Jenks, M.C. Bartelt, J.W. Evans, and P.A. Thiel, "HRLEED Profile Analysis and Diffusion Barrier Estimation for Submonolayer Ag/Ag(100) Homoepitaxy", Phys. Rev. B, 57, 12544-12549 (1998).
C.-M. Zhang, M.C. Bartelt, J.-M. Wen, C.J. Jenks, J.W. Evans, and P.A. Thiel, "Submonolayer Island Formation and the Onset of Multilayer Growth during Ag/Ag(100) Homoepitaxy", Surface Science, 406, 178-193 (1998).
M.C. Bartelt, A.K. Schmidt, J.W. Evans, and R.Q. Hwang, "Island Size and Environment Dependence of Adatom Capture: Cu/Co Islands on Ru(0001)", Physical Review Letters, 81, 1901-1904 (1998).
C.R. Stoldt, A.M. Cadilhe, C.J. Jenks, J.-M. Wen, J.W. Evans, and P.A. Thiel, "Evolution of Far-From-Equilibrium Nanostructures Formed by Cluster-Step and Cluster-Cluster Coalescence in Metal Films", Physical Review Letters, 81, 2950-2953 (1998).
C.R. Stoldt, A.M. Cadilhe, M.C. Bartelt, C.J. Jenks, P.A. Thiel, and J.W. Evans, "Formation and Relaxation of 2D Island Arrays in Metal(100) Homoepitaxy", Prog. Surf. Sci., 59, 67-77 (1998).
J.R. Sanchez and J.W. Evans, "Diffusion of Small Clusters on Metal(100) Surfaces: Exact Master Equation Analysis", Phys. Rev. B, 59, 3224-3233 (1999).
M.C. Bartelt, C.R. Stoldt, C.J. Jenks, P.A. Thiel, and J.W. Evans, "Adatom Capture by Arrays of Two-Dimensional Ag Islands on Ag(100)", Phys. Rev. B, 59, 3125-3134 (1999).
M.C. Bartelt and J.W. Evans, "Temperature Dependence of Roughening during Metal(100) Homoepitaxy: Kinetic Phase Transition from Mounding to Smooth Growth", Surface Science,
423, 189-207 (1999).
A.M. Dabiran, S.M. Seutter, S. Stoyanov, M.C. Bartelt, J.W. Evans, and P.I. Cohen, "Step Edge Barriers vs Step Edge Relaxation in GaAs:Sn MBE", Surface Science, 438, 131-141 (1999).
C.R. Stoldt, C.J. Jenks, P.A. Thiel, A.M. Cadilhe, and J.W. Evans, "Smoluchowski Ripening of Ag Islands on Ag(100)", J. Chem. Phys., 111, 5157-5166 (1999)
A.M. Cadilhe, C.R. Stoldt, C.J. Jenks, P.A. Thiel, and J.W. Evans, "Evolution of Far-From-Equilibrium Nanostructures on Ag(100) Surfaces: Protrusions and Indentations at Extended Step Edges", Phys. Rev. B, 61, 4910-4925 (2000).
P.A. Thiel and J.W. Evans, "Nucleation, Growth, and Relaxation of Thin Films in Metal(100) Homoepitaxy", J. Phys. Chem. B, 104, 1663-1676 (2000) - Feature Article.
M.C. Bartelt, J.B. Hannon, A.K. Schmid, C.R. Stoldt, and J.W. Evans, "Island Formation during Deposition and Etching", J. Colloids and Surfaces A, 165, 373-403 (2000).
C.R. Stoldt, K.J. Caspersen, M.C. Bartelt, C.J. Jenks, J.W. Evans, and P.A. Thiel, "Using Temperature to Tune Film Roughness: Non-Intuitive Behavior in a Simple System", Physical Review Letters, 85, 800-803 (2000).
K.J. Caspersen, C.R. Stoldt, A.R. Layson, M.C. Bartelt, P.A. Thiel, and J.W. Evans, "Morphology of Multilayer Ag/Ag(100) Films versus Deposition Temperature: STM Analysis and Atomistic Lattice-Gas Modeling," Phys. Rev. B, 63, 085401 (2001), 15pp.
W.W. Pai, J.F. Wendelken, C.R. Stoldt, P.A. Thiel, J.W. Evans, and Da-Jiang Liu, "Evolution of Two-Dimensional Worm-Like Nanoclusters on Metal Surfaces", Physical Review Letters 86, 3088-3091 (2001).
J.W. Evans and M.C. Bartelt, "Nucleation, Adatom Capture, and Island Size Distributions: Unified Scaling Analysis for Submonolayer Deposition", Phys. Rev. B, 63, 235408 (2001), 15 pp.
K.J. Caspersen and J.W. Evans, "Homoepitaxial Growth of Metal Films at Very Low Temperatures: Lattice-Gas Models with Restricted Downward Funneling", Phys. Rev. B, 64, 075401 (2001), 11pp.
A.R. Layson, J.W. Evans, and P.A. Thiel, "Additive-Enhanced Coarsening and Smoothening of Metal Films: Complex Mass-Flow Dynamics underlying Nanostructure Evolution", Phys. Rev. B 65, 194409 (2002), 4 pp.
K.J. Caspersen, A.R. Layson, C.R. Stoldt, V. Fournee, P.A. Thiel, and J.W. Evans, "Development and Ordering of Mounds during Metal(100) Homoepitaxy" , Phys. Rev. B 65, 193407 (2002), 4pp.
D.-J. Liu and J.W. Evans, "Sintering of 2D Nanoclusters in Metal(100) Homoepitaxial Systems: Comparison of Atomistic and Continuum Modeling", Phys. Rev. B. 65, in press (2002).

Recent Journal Publications on Surface Reactions (1998-onward):

M. Tammaro and J. W. Evans, "Chemical Diffusivity and Wave Propagation in Surface Reactions: Lattice-Gas Model mimicking CO-Oxidation with High CO-Mobility", J. Chem. Phys., 108, 762-773 (1998).
M. Tammaro and J.W. Evans, "Chemical Diffusion in Mixed Adlayers and Wave Propagation in Surface Reactions", Surface Science Letters, 395, L207-214 (1998).
M. Tammaro and J.W. Evans, "Reactive Removal of Unstable NO+CO Adlayers : Chemical Diffusion and Reaction Front Propagation", J. Chem. Phys., 108, 7795-7806 (1998).
M. Tammaro and J.W. Evans, "Hydrodynamic Limits for the Monomer-Dimer Surface Reaction Models: Chemical Diffusion, Wave Propagation, and Equistability", Phys. Rev. E, 57, 5087-5094 (1998).
M. Tammaro, J.W. Evans, C.S. Rastomjee, W. Swiech, A.M. Bradshaw, and R. Imbihl, "Reaction-Diffusion Front Propagation across Stepped Surfaces during Catalytic Oxidation of CO on Pt(100)", Surface Science, 407, 162-170 (1998).
Yu. Suchorski, J. Beben, E.W. James, J.W. Evans, and R. Imbihl, "Fluctuation-Induced Transitions in a Bistable Surface Reaction: catalytic CO-oxidation on a Pt Field Emitter Tip", Physical Review Letters, 82, 1907-1910 (1999).
E.W. James, C. Song, and J.W. Evans, "CO-Oxidation Model with Superlattice Ordering of Adsorbed Oxygen I. Steady-State Bifurcations", J. Chem. Phys., 111, 6579-6589 (1999).
Da-Jiang Liu and J.W. Evans, Symmetry-Breaking and Percolation Transitions in a Surface Reaction Model with Superlattice Ordering, Physical Review Letters, 84, 955-958 (2000).
E.W. James, Da-Jiang Liu, and J.W. Evans, "Relaxation Effects in Random Sequential Adsorption: Application to Chemisorption Systems", J. Colloids and Surfaces A, 165, 241-254 (2000).
Da-Jiang Liu and J.W. Evans, "Ordering and Percolation Transitions for Hard-Squares: Equilibrium versus Non-equilibrium Models for Adsorbed Layers with c(2x2) Superlattice Ordering", Phys. Rev. B, 62, 2134-2145 (2000).
Da-Jiang Liu and J.W. Evans, "Surface Diffusion in Mixed Adlayers with Superlattice Ordering: Percolative Transport around Obstacles and along Domain Boundaries", J. Chem. Phys. 113, 10252-10264 (2000).
Yu. Suchorski, J. Beben, R. Imbihl, E.W. James, Da-Jiang Liu, and J.W. Evans, "Fluctuations and Critical Phenomena in Catalytic CO-Oxidation on Nanoscale Pt Facets", Phys. Rev. B 63, 165417 (2001), 12pp.
D.-J. Liu and J.W. Evans, "Phase Transitions in Mixed Adsorbed Layers: Effect of Repulsions between 'Hard-Squares' and 'Point-Particles'", J. Chem. Phys., 114, 10977-10978 (2001).
N. Pavlenko, J.W. Evans, D.-J. Liu, and R. Imbihl, "Catalytic CO Oxidation on Nanoscale Pt Facets: Effect of Inter-facet CO Diffusion on Bifurcation and Fluctuation Behavior", Phys. Rev. E 65, 016121 (2002), 8 pp.
J.W. Evans, D.-J. Liu, M. Tammaro, "From Atomistic Lattice-Gas Models for Surface Reactions to Hydrodynamic Reaction-Diffusion Equations", Chaos 12,131-143 (2002). (Focus Issue: Nonlinear Pattern Formation in Surface Science, edited by A.S. Mikhailov, and G. Ertl)
C.H. Choi, D.-J. Liu, J.W. Evans, and M.S. Gordon, "Passive and Active Oxidation of Si(100) by Atomic Oxygen: Theoretical Study of Possible Reaction Mechanisms", J. Am. Chem. Soc. 124, 8730-8740 (2002).
D.-J. Liu and J.W. Evans, "Fluctuations and Bistability in a Hybrid Atomistic Model for CO Oxidation on Nanofacets: An Effective Potential Analysis", J. Chem. Phys. 117, in press (2002).

Selected Previous Journal Publications:

J. W. Evans, "Two-Hilbert Space Formulations of the Quantum Statistical Mechanics of Reactive Fluids: Dimer Formation and Decay," J. Chem. Phys. 85, 5991-6003 (1986).
J. W. Evans, D. E. Sanders, P. A. Thiel and A. E. DePristo, "Low-Temperature Epitaxial Growth of Thin Film Metal Films," Phys. Rev. B (Rapid Comm.) 41, 5410-5413 (1990).
J. W. Evans and M. S. Miesch, "Characterizing Kinetics below a First-Order Catalytic Poisoning Transition," Physical Review Letters, 66, 833-836 (1991).
M. C. Bartelt and J. W. Evans, "Scaling Analysis of Diffusion-mediated Island Growth in Surface Adsorption Processes," Phys. Rev. B, 46, 12675-12687 (1992).
J. W. Evans, "Random and Cooperative Sequential Adsorption", Reviews of Modern Physics, 65, 1281-1329 (1993).
M. C. Bartelt and J. W. Evans, "Nucleation and Growth of Square Islands during Deposition: Sizes, Coalescence, Separations and Correlations," Surface Science, 298, 421-431 (1993).
S. Gunther, E. Kopatzki, M. C. Bartelt, J. W. Evans, and R. J. Behm, "Anistropy in Nucleation and Growth of Two-Dimensional Islands during Homoepitaxy on 'Hex' Reconstructed Au(100)," Physical Review Letters, 73, 553-556 (1994).
J. W. Evans and T. R. Ray, "Interface Propagation and Nucleation Phenomena for Discontinuous Poisoning Transitions in Surface Reaction Models," Phys. Rev. E, 50, 4302-4314 (1994).
J.-M. Wen, S.-L. Chang, J. W. Burnett, J. W. Evans, and P. A. Thiel, "Diffusion of Large Two-Dimensional Ag Clusters on Ag(100)," Physical Review Letters, 73, 2591-2594 (1994).
M. C. Bartelt and J. W. Evans, "Transition to Multilayer Kinetic Roughening for Metal (100) Homoepitaxy", Physical Review Letters, 75, 4250-4253 (1995).
M.C. Bartelt and J.W. Evans, "Exact Island Size Distributions for Submonolayer Deposition: Influence of Correlations between Island Size and Separation", Phys. Rev. B (Rapid Comm.) 54, R17359-17362 (1996).
J.-M. Wen, J. W. Evans, M. C. Bartelt, J. W. Burnett, and P. A. Thiel, "Coarsening Mechanisms in a Metal Film: From Cluster Diffusion to Vacancy Ripening", Physical Review Letters, 76, 652-655 (1996).

Course Information

Math 426 (Fall 2002): Mathematical Models in the Physical Sciences

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Last updated: 8/4/00