Edward Doomes |
|Department of Physics, Room 229, James Hall
Southern University and A&M College, Baton Rouge, LA 70813
|225-771-4130 Ext. 22
- 2002: Louisiana State University, Baton Rouge, Louisiana
Ph.D., Experimental Physical Chemistry;
X-Ray Spectroscopy of geometrically constrained systems
- 1993: Morehouse College, Atlanta, GA
B.S., Chemistry (Cum laude)
- 2002-2004: Postdoctoral Research Associate
J. Bennett Johnston, Sr. Center for Advanced Microstructures and Devices;
Beamline Manager, X-ray Microprobe Beamline
- Characterized samples for CAMD Nanoparticle group with X-ray Absorption Spectroscopy
Managed samples and assigned beam time for external users
Data analysis and assistance with manuscript preparation
Supervised CAMD Research Associates and REU students
FUNDED RESEARCH PROJECTS
2007: Principal Investigator: “Educational Expansion and Research Enhancement with a Dispersive X-ray Fluorescence Spectrometer”; Louisiana Board of Regents; $133,385
2007: Co-Principal Investigator “Advancing the Southern University Partnership with LIGO in Materials Research and Science Education”; National Science Foundation; $200,000
2006: Co-Principal Investigator: “The Enhancement of X-ray Powder Diffractometer Capabilities in the Material Sciences for Research and Teaching”; Louisiana Board of Regents; $80,000
2005: Principal Investigator: “Molecular Simulations of Electronic Scattering”; SUBR Chancellor’s Start-up Grant; $2899.84
My research interests are focused on using synchrotron radiation for element specific characterization (spatial, electronic, quantitative) of novel materials including optical coating-substrate systems, functionalized nanoparticles, and hydrogen fuel-cell cathode/anode materials using a hard x-ray techniques including extended x-ray absorption fine structure (EXAFS), x-ray absorption near-edge spectroscopy (XANES), x-ray diffraction, and x-ray fluorescence.
In addition to experimentation, there is also molecular modeling and multiple-scattering calculations of x-ray absorption spectra and electronic structure. FEFF, an ab initio multiple scattering code that utilizes Green’s function to simulate the absorption coefficient of model atomic systems is one of the tools used to simulate novel chemical systems. In these calculations we utilize the code to generate XANES spectra and to calculate the local density of states about the absorbing atom. For ordered systems, we use standard crystallographic data to generate coordinates of a central absorbing atom and its neighbors. The area of interest is the spectral region near the absorption threshold of a core electron of a central atom. The simulated XANES spectra represent the excitation a core electron, its promotion to quasi-bound states and its eventual ejection into the continuum. These data lend insight into the local chemical environment of the system of interest.
One of the systems of interest is titania (TiO2)-doped tantala (Ta2O5) multilayers fabricated via ion beam sputtering on SiO2 substrates. These dielectric multilayers play a major role as mirror coatings in high power laser applications such as laser interferometric gravity-wave detectors where noise in the mirrors must be kept to a minimum. At present, exactly how the microscopic features of the coatings influence their macroscopic mechanical loss properties is poorly understood. The goal of our work is to obtain correlations between chemical impurities and/or dopants and the optical absorption and mechanical loss characteristics of these multilayer coatings. To this end we are employing synchrotron-based X-ray absorption Spectroscopy (XAS) techniques including Extended X-ray Absorption Fine Structure (EXAFS), X-ray Absorption Near Edge Structure (XANES) and X-ray Fluorescence (XRF) to examine our samples. The figure below displays XRF spectra taken on the DCM beamline at CAMD.
Figure 1a. and 1.b. Partial X-ray fluorescence spectra taken on multilayer coating samples at the CAMD Double Crystal Monochromator (DCM) beamline.
BELOW ARE SELECTED PUBLICATIONS IN PHYSICS, IN EDUCATION, AND OTHERS
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Physics Publications: 17. Search for gravitational waves associated with 39 gamma-ray bursts using data from the second, third, and fourth LIGO runs,The LSC: E.E. Doomes, et al., Physical Review D 77 (2008) 062004. (2008).
16. All-sky search for periodic gravitational waves in LIGO S4 data,The LSC: E.E. Doomes, et al;Phys. Rev. D77, 022001. (2008).
15. First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds,The LSC: E.E. Doomes, et al; Physical Review D 76 (2007) 022001. (2007).
14. Upper limits on gravitational wave emission from 78 radio pulsars,The LSC: E.E. Doomes, et al., Physical Review D 76 (2007) 042001. (2007).
13. Searching for a Stochastic Background of Gravitational Waves with the Laser Interferometer Gravitational-Wave Observatory,The LSC: E.E. Doomes, et al; The Astrophysical Journal 659 (2007) 918-930. (2007).
12. Upper limit map of a background of gravitational waves, The LSC: E.E. Doomes, et al; Phys. Rev. D76(2007) 082003. (2007).
11. Search for gravitational-wave bursts in LIGO data from the fourth science run;The LSC: E.E. Doomes, et al;2007Class. Quantum Grav.245343-5369 doi:10.1088/0264-9381/24/22/002. (2007).
10. E.E. Doomes and S.C. McGuire,X-ray absorption spectroscopy of doped and undoped multilayer (SiO2/Ta2O5) coatings on fused silica (SiO2) substrates, Nuclear Instruments and Methods in Physics Research A,582(2007) 245-247.. (2007).
9. Yujun Song, Hartwig Modrow, Laurence L. Henry, Cheng K. Saw, E. E. Doomes, Vadim Palshin, Josef Hormes, and Challa S. S. R. Kumar,Microfluidic Synthesis of Cobalt Nanoparticles, Chemistry of Materials;2006;18(12) 2817 - 2827. (2006).
8. H. Modrow, N. Palina, Ch.S.S.R. Kumar, E.E. Doomes, M. Aghasyan, Vadim Palshin, J.C. Jiang, J. Hormes,Characterization of size dependent structural and electronic properties of CTAB-stabilized Cobalt nanoparticles by X-ray absorption spectroscopy,Physica Scripta, Vol. T115, 790-793, 2005. (2005).
7. Displacement synthesis of Cu shells surrounding Co nanoparticles, Guo, ZH.; Kumar, CSSR.; Henry, LL.; Doomes, EE.; Hormes, J.; Podlaha, EJ.; Journal of the Electrochemical Society. 152(1):D1-D5, 2005.. (2005).
6. Yujun Song, E. E. Doomes, John Prindle, Roland Tittsworth, Josef Hormes and Challa S.S.R. Kumar,Investigations into Sulfobetaine-Stabilized Cu Nanoparticle Formation: Toward Development of a Microfluidic Synthesis. Journal of Physical Chemistry B,109(19), 9330 -9338, 2005. (2005).
5. Efficacy of Lytic Peptide-Bound Magnetite Nanoparticles in Destroying Breast Cancer Cells; Challa S.S.R. Kumar, Carola Leuschner, E.E. Doomes, Larry Henry, Martha Juban, and Josef Hormes;Journal of Nanoscience and Nanotechnology,4(3);245-249, 2004. (2004).
4. Synthesis and characterization of S-Au interaction in gold nanoparticle bound polymeric beads, C.S.S.R. Kumar, M. Aghasyan, H. Modrow, E.E. Doomes, C. Henk, J. Hormes, Journal of Nanoparticle Research 6(4), 369-376 2004.. (2004).
3. Doomes E.E., McCarley R.L., Poliakoff E.D., Correlations between heterocycle ring size and x-ray spectraJournal of Chemical Physics119(8): 4399-4404.
2. Doomes E.E., Floriano P.N., Tittsworth R.W., McCarley R.L., Poliakoff E.D., Anomalous XANES spectra of octadecanethiol adsorbed on Ag(111),Journal of Physical Chemistry B107(37): 10193-10197.
1. Floriano P.N., Schlieben O., Doomes E.E., Klein I., Janssen J., Hormes J., Poliakoff E.D., McCarley R.L., A grazing incidence surface X-ray absorption fine structure (GIXAFS) study of alkanethiols adsorbed on Au, Ag, and CuChemical Physics Letters321(1-2): 175-181
Other Publications:7. LIGO Mirror Coatings X-ray Absorption Measurements,E.E. Doomesand S.C. McGuire, LIGO Scientific Collaboration Meeting, Louisiana State University, August 16 2006.. (2006).
6. Initial X-ray Spectroscopy Measurements in LIGO Mirror Coatings,E.E. Doomes, S.C. McGuire, and R.C. Tittsworth, Laser Interferometer Gravitational Observatory Scientific Collaboration Meeting, Hanford Washington, August 13th, 2005.. (2005).
5. E.E. Doomes, X-ray Absorption Studies of Tailored Chemical Systems, Department of Physics Weekly Seminar, Southern University, Baton Rouge; April 21st 2004.. (2004).
4. Phase-Controlled synthesis of Cobalt Nanoparticles Using a Microfluidic Reactor,Yujun Song,Edward Doomes, Zhanhu Guo, Challa Kumar and Josef Hormes; Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana. 2004 Materials Research Society Fall Meeting, Boston Massachusetts, November 29th-December 3rd.. (2004).
3. E.E. Doomes, Mher Aghasyan, Vadim Palshin, Roland Tittsworth, Josef Hormes and Challa Kumar: X-ray Absorption Spectroscopy - A Unique Tool for Characterization of Nanoparticles, NSF-EPSCOR meeting, LaTech, Ruston December 2002. (2002).
2. E. E. Doomes, E. D. Poliakoff, R. W. Tittsworth, and R. W. Zurales, Bond-angle Dependent Photoionization Effects: XANES Studies of Tailored Heterocyclic Systems at the Gordon Conference on Photoions, Photoionization, and Photodetachment, Williams College, Williamstown, Massachusetts July 2001.. (2001).
1. E.D. Poliakoff, G.J. Rathbone, J.S. Miller,E.E. Doomes, R.R. Lucchese and J.D. Bosek, Resonantly amplified vibronic symmetry breaking valence-shell studies and implications for x-ray spectroscopy, Invited talk at 221st American Chemical Society National Meeting, San Diego, California, 1-5 April 2001. (2001).