- (404) 894-4012
- MSE G209C
- Research Group
Honors & Awards
Electron and photon stimulated interface & surface processes. Environmental Chem. & planetary surface science. Biophysical Chem.
Electron- and Photon-stimulated Interface and Surface Processes. Dr. Orlando's group utilizes state-of-the-art ultra-high vacuum (UHV) surface science systems equipped with UV-laser sources and low-energy electron beams to stimulate reactions (such as the production of hydrogen) on a variety of substrates and interfaces. Sensitive laser detection schemes (resonance-enhanced multiphoton ionization) are used to probe the reaction dynamics. Approaches based on quantum mechanical interference to control desorption and patterning of surfaces at the nano- and meso-scale are also being developed.
Environmental Chemistry and Planetary Surface Science. Water is ubiquitous in terrestrial and planetary atmospheres and environments. Dr. Orlando's group studies "wet" interfaces using nanoscale films of ice grown in UHV. Radical and ion-molecule reactions are then initiated using electron- and photon-beam sources. These experiments are relevant to understanding the photochemistry of stratospheric cloud particles and magnetospheric processing of icy satellite surfaces in the Jovian system.
Biophysical Chemistry. The mechanisms of DNA damage and repair have been studied extensively, though the role intrinsic waters of hydration play in initiating damage have not been elucidated. Dr. Orlando's group will carry out electron- and photon-irradiation studies of DNA:water interfaces to examine the importance of direct vs. indirect damage.
"Low-energy electron diffraction and induced damage in hydrated DNA," Thomas M. Orlando, Doogie Oh, Yanfeng Chen, Alexandr B. Aleksandrov, J. Chem. Phys., 2008, 128, 195102.
"Inelastic electron scattering and energy-selective negative ion reactions in molecular films on silicon surfaces," Christopher D. Lane, Thomas M. Orlando, Applied Surface Science, 2007, 253(16), 6646-6656.
"Analysis of organoselenium and organic acid metabolites by laser desorption single photon ionization mass spectrometry," Yanfeng Chen, M. Cameron Sullards, Tiffany T. Hoang, Sheldon W. May, Thomas M. Orlando, Anal. Chem., 2006, 78(24), 8386-8394.
"Zone specificity in low energy electron stimulated desorption of Cl+ from reconstructed Si(111)-7x7 : Cl surfaces," Doogie Oh, Matthew T. Sieger, Thomas M. Orlando, Surf. Sci., 2006, 600(19), L245-L249.
"Highly efficient electron stimulated desorption of 0+ from gadolinia-doped ceria surfaces," Haiyan Chen, Alex Aleksandrov, Shaowu Zha, Meilin Liu, Thomas M. Orlando, J. Phys. Chem. B, 2006, 110, 10779-10784.
"Low-energy electron stimulated desorption of neutrals from multilayers of SiCl4 on Si(111)," Christopher D. Lane, Thomas M. Orlando, J. Chem. Phys., 2006, 124, 164702.
"A beta microirradiator," J. Summerour, Y. Chen, M. Josowicz, T. M. Orlando, J. Janata, A. Paulenova, Rad. Phys. Chem., 2006, 75, 369-374.
"Production of oxygen by electornically induced dissociations in ice," R. E. Johnson, P. D. Cooper, T. I. Quickenden, G. A. Grieves, T. M. Orlando, J. Chem. Phys., 2005, 123(18), 184715.
"Electron stimulated desorption of cations from CiCl4 multilayers adsorbed on Si(111)," C. D. Lane, K. R. Shepperd, A. B. Aleksandrov, T. M. Orlando, Surf. Sci., 2005, 593, 173-179.
"The importance of pores in the electron stimulated production of D-2 and O-2 in low temperature ice," G. A. Grieves, T. M. Orlando, Surf. Sci., 2005, 593, 180-186.
"Low-energy (5-250 eV) electron-stimulated desorption of H+, H-2(+), and H+(H2O)(n) from low-temperature water ice surfaces," J. Herring-Captain, G. A. Grieves, A. Alexandrov, M. T. Sieger, H. Chen, T. M. Orlando, Phys. Rev. B, 2005, 72(3), 035431.
"Probing water interractions and vacancy production on gadolinia-doped ceria surfaces using electron stimulated desorption," H. Y. Chen, A. Aleksandrov, Y. F. Chen, S. Zha, M. L. Liu, T. M. Orlando, J. Phys. Chem. B, 2005, 109(22), 11257-11262.
"The chemical nature of Europa surface material and the relation to a subsurface ocean," Thomas M. Orlando, Thomas B. McCord, Gregory A. Grieves, Icarus, 2005, 177, 528-533.
"Charging effects on electron-stimulated desorption of cations from gadolinia-doped ceria surfaces," H. Chen. Y. Chen. A. Aleksandrov, J. Dong, M. Liu, T. M. Orlando, Appl. Surf. Sci., 2005, 243, 166-177.
"Electron collisions with complex targets: Diffraction effects in stimulated desorption," T. M. Orlando, D. Oh, M. T. Sieger, C. D. Lane, Physica Scripta, 2004, T110, 256-261.
"Stimulated desorption of cations from pristine and acidic low-temperature water ice surfaces," J. Herring, A. Aleksandrov, T. M. Orlando, Physical Rev. Letts., 2004, 92, 187602-1 to 187602-4.
"The reactions of NO2 and CH3CHO with Na-Y zeolite and the relevance to plasma-activated lean NOx catalysis," Thomas M. Orlando, Alex Alexandrov, Andrew Lebsack, Janine Herring, John W. Hoard, Catalysis Today, 2004, 89, 151-157.
Three-Dimensional Nanoengineered Assemblies, editors: Thomas M. Orlando, Lhadi Merhari, David P. Taylor, Koji Ikuta, Material Research Society, December 1-5, 2002 Symposium Proceedings, 2003, 739.
"Electron-stimulated desorption of H+, H2+, OH+, and H+(H2O)n from water-covered zirconia surfaces," Thomas M. Orlando, Alex B. Aleksandrov, and Janine Herring, J. Phys. Chem. B, 2003, 107, no. 35, 9370-9376.
"Electron-stimulated desorption of D2O coadsorbed with CO2 ice at VUV and EUV energies," L. Siller, M. T. Sieger, T. M. Orlando, J. Chem. Phys., 2003, 118, no. 19, 8898-8904.
"The role of electron-stimulated production of O2 from water ice in the radiation processing of outer solar system surfaces," T. M. Orlando and M. T. Sieger, Surf. Sci., 2003, 528, 1-7.
"Far-out surface science: radiation-induced surface processes in the solar system," Theodore E. Madey, Robert E. Johnson, Thom M. Orlando, Surf. Sci., 2002, 500, 838-858.
"Brines exposed to Europa surface conditions," Thomas B. McCord, Glenn Teeter, Gary B. Hansen, Mathew T. Sieger, and Thomas M. Orlando, J. Geophys. Res., 2002, 107, no. E1, 4-1 to 4-6.
"Thermal and radiation stability of the hydrated salt minerals epsomite, mirabilite, and natron under Europa environmental conditions," Thoms B. McCord, Thomas M. Orlando, Glenn Teeter, Gary B. Hansen, Matthew T. Sieger, Nikolay G. Petrik, and Lisa Van Keulen, J. Geophys. Res., 2001, 106, no. E2, 3311-3319.
"Role of excitons in electron- and photon-stimulated desorption of neutrals from alkali halides," A. Alexandrov, M. Piacentini, N. Zema, A. C. Felici, and T. M. Orlando, Phys. Rev. Letts., 2001, 86, no. 3, 536-539.