Hi, my name is
I am a PhD graduate in Photochemical Sciences, a desktop and frontend developer with strong user interface design skills.
BGSU Ph.D. graduate with expertise in gamma spectroscopy, positron annihilation spectroscopy, microscopy, and nuclear physics. Strong background in computational techniques, desktop software development, and web applications. More than five years in user interface and user experience design.
🗽 Permanent resident authorized to work in the USA.
Characterization facilities. Positron Lifetime and Doppler Broadening Annihilation Spectroscopy (PALS, DBAR). Atom Probe Tomography (ATP). Scanning Electron Microscopy (SEM). Transmission electron microscopy (TEM). Atomic Force Microscopy (AFM). UV-VIS Spectroscopy. Fourier Transform Infrared Spectroscopy (FTIR).
Materials processing. High-temperature annealing. Wet chemical etching. Electrical Contact Fabrication. Sample polishing.
Thomas Jefferson National Accelerator Facility
• Newport News, VA, USA
Catholic University of America
• Washington, DC, USA
Remote Positions
Center for Photochemical Sciences
• Bowling Green, OH, USA
Gridnine Systems
• Moscow, Russia
Yunium Educational Center at MIPT
• Moscow, Russia
Provided instructions and guidance to middle school students on the following computer courses:
Institute for Theoretical and Experimental Physics (ITEP)
• Moscow, Russia
Ph.D. Doctor of Philosophy in photochemical sciences. Occupation: materials science, interaction of ionizing radiation with matter, radiation defects in solids, radiation chemistry, gamma-spectroscopy, positron annihilation spectroscopy.
Dissertation topic: New developments in positron annihilation spectroscopy techniques: from experimental setups to advanced processing software. Download manuscript with corrections.
Under the guidance of Dr. Selim I have successfully assembled and maintained Doppler and lifetime positron spectrometers from ORTEC and Canberra fast-timing units. My research was aimed at the application of Doppler and lifetime positron spectroscopy techniques to study the following effects in materials:
My research required a good understanding of single-photon counting techniques with HPGe and scintillation-based detector systems. I manufactured sources of positron radiation and was responsible for inventorying the radioactive materials.
I have developed several open-source desktop GUI software solutions for fitting and interpreting the raw positron experimental spectra. Software is written in C++, it extensively utilizes the CERN ROOT and RooFit frameworks.
Additionally, I created was responsible for creating websites for the research groups and international conferences.
B.S. M.S. Bachelor and Master of Science in solid state physics. Monte-Carlo particle simulations with Fortran 95. Maintaining software for CAMECA tomographic atom probe (MSVC). Application of CERN ROOT libraries for fitting and analysis of experimental data.
Thesis topic: Radiation defect studies of nuclear power plant vessel steels by means of positron lifetime annihilation spectroscopy.
Hands-on sessions on supercomputer operation. Got familiar with the newest developments in the supercomputer services: network use with SSH, job control with SLURM scripts, RedHat and CentOS operating systems, CMake compiling platform, parallel environments and more.
Three-month intensive: graphical design and visual communications.
Introduction to the major tricks and instruments of visual communication; learning fundamental rules of illustrations, typography, fonts, and lettering. Intensives on brand identity, graphical language, and advertising campaigns.
Website that features a collection of vinyl stickers for cars.
Figma HTML SCSS Hexo JS
Feel free to check out more of my user interface designs, logos and creative artwork on Dribbble.
During my post-doctorate researcher role at the CUA I was responsible for carrying out Monte Carlo particle simulations in High Energy Physics (HEP). The gold standard simulation toolkit in physics is Geant4. On the other hand, ROOT framework is utilized for the data analysis and processing. Geant4 and ROOT are massive C++ libraries. Delivery of the production-ready software that incorporates these frameworks requires a proper project setup on a local computer.
Please refer to my guidelines on setting up a ROOT and Geant4-based projects in Eclipse IDE below:
I utilized Geant4 framework to collaborate on the Electron-Ion Detector (EIC) project. Additionally, I developed a Geant4-based simulation for studying the performance of scintillation materials. The program reconstructs energy deposition, light yield, and detector response.
A Geant4-based simulation that studies the performance of a novel scintillation material "SciGlass". Simulation reconstructs detector response from the interaction of the scintillation crystals with high energy ionizing particles.
Contributions of the scintillation and Cherenkov-produced light are individually detected. Two types of visible light detectors are supported: Photo-Multiplier tubes (PMT) and Multi-Pixel Photon Counters (MPPC/SiPM). Energy deposition studies in the sensitive part of the detector are carried out.
C++, CMake, Geant4, CERN ROOT framework
My PhD research in physics at BGSU was interdisciplinary with computer science. I developed several desktop software products for data analysis and experimental spectra interpretation. I utilized and contributed to the development of the CERN ROOT framework. ROOT ecosystem offers a variety of tools for histogram manipulation, plotting, fitting, and data storage. The framework allows for building standalone graphical user interface (GUI) software.
Software is designed to process two-dimensional energy spectra and output one-dimensional coincidence broadened Doppler spectrum.
A background fitting and subtraction technique is developed and implemented.
C++, CERN ROOT framework, GNU Automake
Program calculates S and W parameters of the 511 keV peak of the annihilation radiation. Software estimates values of the binding electron energies by fitting the CDB spectrum with contributions from e+ annihilation on electrons with different wave functions.
Electrons from the conduction band contribute to the spectrum as an inverted parabola. Upon the shape of the parabola, we calculate Fermi energy.
C++, CERN ROOT framework, GNU Automake
A flexible terminal-based positron lifetime fitting software. A graphical user interface is in progress.
Software supports deconvolution of lifetime spectra into the conventional multiexponential model as well as trapping model. Supports integration of models with custom fitting parameters.
C++, CERN ROOT framework, GNU Automake
Revealing the Structure of Light Pseudoscalar Mesons at the Electron-Ion Collider.
Arrington, J.; Gayoso, C. A.; Barry, P. C.; Berdnikov, V.; Binosi, D.; Chang, L.; Diefenthaler, M.; Ding, M.; Ent, R.; Frederico, T.; Furletova, Y.; Hobbs, T. J.; Horn, T.; Huber, G. M.; Kay, S. J. D.; Keppel, C.; Lin, H.-W.; Mezrag, C.; Montgomery, R.; Pegg, I. L.; Raya, K.; Reimer, P.; Richards, D. G.; Roberts, C. D.; Rodríguez-Quintero, J.; Romanov, D.; Salmè, G.; Sato, N.; Segovia, J.; Stepanov, P.; Tadepalli, A. S.; Trotta, R. L. J. Phys. G: Nucl. Part. Phys. 2021, 48 (7), 075106. DOI: 10.1088/1361-6471/abf5c3.
Interaction of positronium with dissolved oxygen in liquids.
Stepanov, P. S.; Selim, F. A.; Stepanov, S. V.; Bokov, A. V.; Ilyukhina, O. V.; Duplâtre, G.; Byakov, V. M. Physical Chemistry Chemical Physics 2020, DOI: 10.1039/C9CP06105C
A Model for Joint Processing of LT and CDB Spectra of Dielectric Nano-sized Powders.
Stepanov, P. S.; Selim, F. A.; Stepanov, S. V.; Byakov, V. M. AIP Conference Proceedings 2019, 2182 (1), 040004. DOI: 10.1063/1.5135836
Positron and positronium in Al2O nanopowders.
Stepanov, P. S.; Selim, F. A.; Stepanov, S. V.; Byakov, V. M. AIP Conference Proceedings 2019, 2182 (1), 050008. DOI: 10.1063/1.5135851
Defects and solarization in YAG transparent ceramics.
Zhang, L.; Wu, J.; Stepanov, P.; Haseman, M.; Zhou, T.; Winarski, D.; Saadatkia, P.; Agarwal, S.; Selim, F. A.; Yang, H.; et al. Photonics Research 2019, 7 (5), 549-557 DOI: 10.1364/prj.7.000549
Photoconductivity of bulk SrTiO3 single crystals at room temperature.
Saadatkia, P.; Stepanov, P.; Selim, F. A. Materials Research Express 2018, 5 (1), 016202 DOI: 10.1088/2053-1591/aaa094
Track Effects in Positronium Formation.
Stepanov, S.; Byakov, V.; Duplâtre, G.; Stepanov, P.; Bokov, A. Acta Physica Polonica A 2017, 132 (5), 1461-1466 DOI: 10.12693/APhysPolA.132.1461
Developing new routine for processing two-dimensional coincidence doppler energy spectra and evaluation of electron subsystem properties in metals.
Stepanov, P.; Stepanov, S.; Byakov, V.; Selim, F. Acta Physica Polonica A 2017, 132 (5), 1628-1633 DOI: 10.12693/APhysPolA.132.1628
ZnO Luminescence and scintillation studied via photoexcitation, X-ray excitation, and gamma-induced positron spectroscopy.
Ji, J.; Colosimo, A. M.; Anwand, W.; Boatner, L. A.; Wagner, A.; Stepanov, P. S.; Trinh, T. T.; Liedke, M. O.; Krause-Rehberg, R.; Cowan, T. E.; et al. Scientific reports 2016, 6 (1), 31238 DOI: 10.1038/srep31238
Premelting as studied by positron annihilation and emission Mössbauer spectroscopies.
Stepanov, S. V.; Byakov, V. M.; Zvezhinskiy, D. S.; Duplâtre, G.; Dubov, L. Y.; Stepanov, P. S.; Perfiliev, Y. D.; Kulikov, L. A. Journal of Physics: Conference Series 2016, 674, 012018 DOI: 10.1088/1742-6596/674/1/012018
Scintillation of Un-doped ZnO Single Crystals.
Colosimo, A. M.; Ji, J.; Stepanov, P. S.; Boatner, L. A.; Selim, F. A MRS Advances 2016, 1 (2), 121-126 DOI: 10.1557/adv.2015.60
Early processes in positron and positronium chemistry: possible scavenging of epithermal e by nitrate ion in aqueous solutions.
Stepanov, S. V.; Byakov, V. M.; Duplâtre, G.; Zvezhinskiy, D. S.; Stepanov, P. S.; Zaluzhnyi, A. G. Journal of Physics: Conference Series 2015, 618, 012003 DOI: 10.1088/1742-6596/618/1/012003
The use of positron spectroscopy for revealing the nanosized structures in liquid mixtures. Identification of n-propanol nanoagglomerates in aqueous solutions.
Stepanov, P. S.; Byakov, V. M.; Zaluzhnyi, A. G. Russian Journal of Physical Chemistry A 2014, 88 (4), 685-690 DOI: 10.1134/s003602441404027x
@Orlando, FL, USA
Oral talk “Positions and Ps in Al2O3 Nanopowders”.
@Jefferson Lab, Newport News, VA, USA
Poster “A routine of background subtraction from two-dimensional Doppler broadened spectra”.
@Maria Curie-Sklodowska University, Lublin, Poland
Poster “Developing new routine for processing two-dimensional coincidence Doppler energy spectra”.
@Maumee Bay Lodge & Conference Center, Maumee, OH, USA
Poster “Developing new routine for background subtraction in two-dimensional coincidence Doppler broadening spectroscopy”.
@University of Delaware, Newark, DE, USA
Oral talk “High-Sensitivity Measurements of Defects in ZnO by Means of Digital Coincidence Doppler Broadening of Positron Annihilation Spectroscopy”.
@University of Delaware, Newark, DE, USA
Oral talk “Identification of chemical environment of defects in ZnO by means of digital coincidence Doppler broadening of positron annihilation radiation”.
@Bowling Green State University, OH, USA
Poster “Approaching Structural Defect Characterization and their Chemical Identification by Means of Coincidence Doppler Broadening of Annihilation Radiation”.
@Maria Curie-Sklodowska University, Lublin, Poland
Oral talk “Application of positron spectroscopy for detection of nanostructures in alcohol―aqueous mixtures”.
💻 Linux and open-source software.
🛠 Working on cars and motorcycles.
Currently I am looking for new full-time job opportunities. I am a permanent resident and can lawfully work in the United States.
Get in touchMy inbox is always open. Whether for a potential project or just to say hi, I'll try my best to answer your email!