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Stefan Vajda











Chemist, Cluster Studies Group

Chemistry Division
Bldg. 200, Room A129
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL 60439
Phone: 630-252-8123; Fax: 630-252-4954

M.Sc. (Physical Chemistry, 1985), Ph.D. (Chemistry, 1990), Charles
University Prague, Czechoslovakia (Research advisor Prof. Vlastimil
Fidler, now joint appointment at Brown University, Providence, USA)
Dr. Habil. (Experimental Physics, 2003), Freie Universität Berlin,
Germany (Group of Prof. Ludger Wöste)

Professional Background
1989-1991     Research Assistant, Charles University Prague,
                      Department of Physical Chemistry
1991-1992     Postdoctoral Fellow, The University of Chicago,
                      Department of Chemistry (Prof. G.R. Fleming)
1992-1995     Researcher, Charles University Prague, Departments
                      of Physical Chemistry & Chemical Physics
1995-2000     Researcher, subgroup and project leader, Freie
                      Universität Berlin, Institut für Experimentalphysik
2000-2002     University Assistant (C1), subgroup and project leader,
                      Freie Universität Berlin, Germany
2002-present Chemist, Argonne National Laboratory, Chemistry
                      Division, Argonne, Illinois, USA

Teaching Experience
1985-1994     Photochemistry and General Physical Laboratory Courses,
                      Charles University Prague
1995-2000     Courses and seminars on Atomic and Molecular Physics
                      I & II, Physics Laboratory Courses, Freie Universität Berlin
1985-             Supervisor and cosupervisor of undergraduate, graduate
                      students and postdoctoral employees

Research Stays
1990              Universität Göttingen, Institut für Physikalische Chemie,
1994              Freie Universität Berlin, Institut für Experimentalphysik,

Honors and Awards
1990              Fulbright/USIA grant for postdoctoral research stay in the
                      group of Prof. Graham R. Fleming, The University of
                      Chicago, Department of Chemistry

American Chemical Society, American Physical Society, American
Association for the Advancement of Science, Catalysis Club of Chicago

Professional Activities
– Reviewer of research proposals: DOE, NSF, DFG (German Research
– Reviewer of scientific articles: Applied Physics Letters, Catalysis
   Letters, Collection of Czechoslovak Chemical Communications,
   Encyclopedia of Mass Spectroscopy (Elsevier, Oxford), European
   Physics Journal AP, European Physics Journal D, Journal of Applied
   Physics, Journal of Chemical Physics, Spectrochimica Acta, Science
– Invited to join the Advisory Board of The Dekker Encyclopedia of
   Nanoscience and Nanotechnology, Marcel Dekker, Inc, New York
– Coorganizer, International Workshop on "Analysis and Control of
   Ultrafast Photoinduced Reactions", Berlin, Germany, 2001
– Session Chairman, International Workshop on "Quantum Dynamical
   Concepts: From Diatomics to Biomolecules", Dresden, Germany,
– Member of the Committees for Diploma (M.Sc.) and Ph.D. Theses
   and Thesis Opponent, Charles University Prague 1990-1995, and
   Freie Universität Berlin 1995-2002

Articles in books and journals: 55, Talks presented: around 60

Current Research Interests
Physical and chemical properties of supported size-selected metal
clusters and cluster-based nanomaterials; Synchrotron X-ray studies
of the thermal stability and kinetics of nanoparticle growth; Surface
composition and morphology effects on nanoparticle properties;
Controlled assembly; Optical properties; Nanocatalysis.

Other Areas of Research Expertise
Chemistry of size-selected clusters in the gas phase; Femtosecond
vibrational and fragmentation dynamics in clusters and molecules;
Coherent control of laser-induced processes; Ultrafast time-resolved
spectroscopy on solvated molecular systems (conformational changes
in macromolecules, micellization, solvation dynamics, ionic sphere
relaxation, energy transfer, substrate binding to enzymes).

Communication Skills
Czech, English, German, Hungarian, Russian (poor), Slovak

Selected publications from main areas of
current and previous research

Supported clusters and cluster-based nanomaterials:

"In Situ GISAXS Studies of the Thermal Stability nad Temperature
Induced Growth of Supported Cluster-Based Platinum and Gold
Nanoparticles", S. Vajda, R.E. Winans, J.W. Elam, B. Lee, M.J. Pellin,
S.J. Riley, S. Seifert, G.Y. Tikhonov and N. A. Tomczyk, Am. Chem.
Soc., Div. Fuel Chem.
2005, 50(1), pp.190-191 (invited paper)

"Thermal Stability of Supported Platinum Clusters Studied by In Situ
GISAXS", R. E. Winans, S. Vajda, B. Lee, S. J. Riley, S. Seifert,
G.Y. Tikhonov, and N. Tomczyk, J. Phys. Chem. B 108, 18105

Chemistry of free size-selected clusters:

" Strongly Cluster Size Dependent Reaction Behavior of CO with O2
on Free Silver Cluster Anions", L. D. Socaciu, J. Hagen, J. Le Roux,
D. Popolan, T. M. Bernhardt, L. Wöste, and S. Vajda, J. Chem Phys.
120, 2078 (2004)

"Reactions of Size-Selected Metal Cluster Ions", S. Vajda, T. Leisner,
S. Wolf, L. Wöste, Phil. Mag. B 79, 1353 (1999)

Ultrafast laser studies of molecular processes in the gas phase:

"Observation and Theoretical Description of the Periodic Geometric
Rearrangement in Electronically Excited Non-Stochiometric Sodium-
Fluoride Clusters", S. Vajda, C. Lupulescu, A. Merli, F. Budzyn,
L. Wöste, M. Hartmann, J. Pittner, and V. Bonacic-Koutecký, Phys.
Rev. Lett.
89, 213404-1 (2002)

"The Relaxation from Linear to Triangular Ag3 Probed by Femtosecond
Resonant Two-Photon Ionization", T. Leisner, S. Vajda, S. Wolf , L.
Wöste, and R.S. Berry, J. Chem. Phys. 111, 1017 (1999)

Coherent control:

"Probing and Controlling Molecular Dynamics with Tailor-Made
Femtosecond Pulses", S. Vajda, and L. Wöste in The Dekker
Encyclopedia of Nanoscience and Nanotechnology
, Editors:
J. A. Schwartz, C. Cotescu,and K. Putyera, Marcel Dekker, Inc.,
New York, invited review article, submitted (2005)

"Deciphering the Reaction Dynamics Underlying Optimal Control
Laser Fields", C. Daniel, J. Full, L. González*, C. Lupulescu, J.
Manz, A. Merli, S. Vajda*, and L. Wöste, Science 299, 536 (2003)

Ultrafast molecular dynamics in the liquid phase:

"Femtosecond through Nanosecond Time Scale Solvation Dynamics
in Pure Water and Inside the g-Cyclodextrin Cavity", S. Vajda,
R. Jimenez, E.W. Castner, Jr., S.J. Rosenthal, V. Fidler, and G.R.
Fleming, J. Chem. Soc. Faraday Transactions 91, 867 (1995)

"Nanosecond Fluorescence of Tryptophans in Cytochrome
P450SCC (CYP 11 A1): Effect of Substrate Binding", P. Anzenbacher,
J. Hudecek, S. Vajda, V. Fidler, C. Laroque, and R. Lange, Biochem.
Biophys. Res. Commun.
181, 1493 (1991)

"Time-Resolved Fluorescence Study of Chain Dynamics. I.
Poly(Methacrylic Acid) in Dilute Water Solutions", B. Bednar,
S. Vajda, V. Fidler, J. Trnena, P. Svoboda, and K. Prochazka,
24, 2054 (1991)

"Time-Resolved Fluorescence Study of Micellizing Block Copolymers",
K. Prochazka, S. Vajda, V. Fidler, B. Bednar, E. Mukhtar, M. Almgren,
and A.S. Holmes, J. Mol. Struct. 219, 377 (1990)


Complete List of Publications



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