Member of the National Academy of Sciences
Member of the Athenian Academy, Greece
Tolman Medal, American Chemical Society
American Chemical Society Peter Debye Award in Physical Chemistry
Irving Langmuir Prize in Chemical Physics
The Cressy-Morrison Science Award in Natural Sciences
Distinguished Faculty Research Award, University of California, Irvine
The ACS Tolman Medal
Femtosecond time-resolved x-ray diffraction and EXFAS experiments allow our group to determine the structures of ultrashort lived intermediates formed during the course of chemical and biological reactions in liquids.
In addition, the mechanism, the structure of fast decaying intermediate species and excited states involved in electron transfer processes of biological and chemical molecules is determined by means of ultrafast laser spectroscopy and femtosecond x-ray diffraction and absorption.
We have designed and built an experimental system which generates high energy, 150mj, 100x10-15 s laser pulses in the 180 nm to 1500 nm spectral range, that we utilize to generate 5 Kev to 20 Kev, 10-12 second intense, x-ray pulses. These laser pulses are used to initiate chemical and biological reactions in the liquid and solid state which are probed by picosecond and x-ray and x-ray continua pulses. The structures of the original molecules, their products and intermediates formed in the course of chemical and biological reactions are measured by means of ultrafast laser and x-ray spectroscopy. By these methods, bond distances, structures and kinetics of ultrafast molecular transients have been measured with an accuracy of 0.02 A and 10-12 s resolution. Lattice stress and lattice constant changes induced by femtosecond light pulses in metals and semiconductors have also been measured with similar resolution employing subpicosecond x-ray diffraction.
Using two photon processes we have pioneered Terabyte 3D optical storage in DVD type disks. Subpicosecond experiments allow us to probe non-linear phenomena and kinetics of molecules used for 3D optical storage and electronic switching.
Lately, we are applying our laser and x-ray knowledge & techniques for the deactivation of bacteria and viruses in blood.
“Terabyte recorded in a two-photon 3D disk”, E. Walker, A. Dvornikov. P. M. Rentzepis. Applied Optics. 47, 22,.4133, 2008
“Two Photon 3d optical Storage”, E. Walker, and P. M. Rentzepis. (Invited paper) Nature , Photonics 2, 406, 2008
“Materials for Terabyte optical storage”, A.S. Dvornikov, E. Walker, P. M. Rentzepis. invited, SPIE Proceedings on Organic materials for 3D storage 7053, 07, 2008
“Electron transfer mechanisms and photochemistry of Ferrioxalate induced by excitation in the CT band”, Jie Chen, H. Zhang, I.V. Tomov, P.M. Rentzepis. inorg. Chem. 47,6, 2008
“Photoelectron detachment and solvated electron dynamics of the Kobalt, (111) and Fe(111) Oxalate complexes”, H. Zhang, Jie Chen, I.V. Tomov, A. S. Dvornikov, P.M. Rentzepis. JPCA 111, 11584-88, 2008
“Photochemistry and Electron Transfer Mechanism of Transition Metal Oxalato Complexes Excited in the Charge Transfer Band”, Jie Chen1, Hua Zhang1, Ivan V. Tomov1, Xunliang Ding2, Peter M. Rentzepis1*. PNAS 105,40,15235-15240, 2008
“Formation of oxazine dye by photochemical reaction of N-acyl oxazine derivative”, Masaharu Akiba, Alexander S. Dvornikov, and Peter M. Rentzepis. J photochem. Photbio. A. 190,69-76, 2007
“Laser Induced Transient Structures in Gold Nanocrystals”, Jie Chen, Hua Zhang,Ivan V. Tomov, P. M. Rentzepis. J.Chi. Chem. Soc. 54(6), 1619-1628, 2007
“Electron Transfer and Dissociation Mechanism of Ferrioxalate: A Time Resolved Optical and EXAFS Study”, Jie Chen1, HuaZhang1, Ivan V. Tomov1, Xunliang Ding2, Peter M. Rentzepis. Chem Phys. Lett 437,50-55, 2007
“Towards TB optical storage”, E. Walker, A.S. Dvornikov, P. M. Rentzepis. Optics Express,. 15,19, pp.12264-12276 2007
“253 GB Recorded in Two Photon 3D Disk.” E. Walker, A. Dvornikov, P. M. Rentzepis. SPIE, 6620, 66, 2007
“Transient structures and kinetics of the Ferrioxalate Redox Reaction studied by Time resolved EXAFS, Optical Spectroscopy and DFT” Jie Chen, H. Zhang, I.V. Tomov, M. Wolfberg. P.M. Rentzepis. JPCA 111, 9326-35, 2007
“A new class of materials for two-photon 3D optical data storage”, E. Walker, A.S. Dvornikov, P. M. Rentzepis. linear & non-linear optic 6311,2006
“Hot electron blast wave generated by femtosecond laser pulses on thinAu (III) crystal, monitored by subpicosecond x-ray ray diffraction”, Jie Chen, I.V. Tomov, Hani El Sayed-Ali, P. M. Rentzepis. Chem. Phys. Lett. 419,374-378, 2006
“A new class of materials suitable for two-photon 3D optical data storage”, Masaharu Akiba, Alexander Dvornikov, Peter M. Rentzepis. Proceedings of SPIE, v.6331, 2006
“Two-photon 3D high-density optical storage media: optical properties, temperature, radiation, and fatigue studies”, A.S. Dvornikov, T.D.Milster, E. Walker, P. M. Rentzepis. Proceedings of SPIE, v.6308, 2006
“Studies of New Non-Destructive Read-out Media for Two Photon 3D high Density Storage”, A. S. Dvornikov, E. Walker, P. M. Rentzepis. Proceedings of SPIE, v.6331, 2006
“Dependence on viscosity of a Composite Photochromic Molcule”, A. Dvornikov, Y. Liang, P.M. Rentzepis. Photochem. Photobio. J. Mater. Chem., 15, 1072 – 1078, 2005
“Dependenceof the fluorescence of a composite photochromic molecule on structure and viscosity”, A. Dvornikov, Y Liang, P. M. Rentzepis. J Mater. Chem. 15, 1072-1078, 2005
“Charge Transfer Solvent Stabilized (CBr3+ //Br-)solv. Ion Pair Formed During the Photolysis of CBr4”, Hua Zhang, Jie Chen, P. M. Rentzepis. J Phys. Chem. A. 109, 5984-5988, 2005
“A Polarity Dependent Fluoresce Switch In Live Cells”, Michael W. Berns, Tatiana Krasieva, Chung-Ho Sun, Alexander Dvornikov, Peter M. Rentzepis. Photochem Photobio 75, 51-56, 2004