Journal of Chromatography & Separation Techniques
Open Access

Fully Relativistic Electron Impact Excitation Cross-sections and Plasma Modeling

International Summit on Current Trends in Mass Spectrometry

July 13-15, 2015 New Orleans, USA

Rajesh Srivastava

Posters-Accepted Abstracts: J Chromatogr Sep Tech

Abstract :

There is need to develop collisional radiative (CR) models for both inert gases and tungsten plasma. Addition of inert gases in trace amounts does not perturb the plasma and its non-invasive feature makes it attractive option for plasma diagnostics. Tungsten in planned to be used in the divertor region of International Thermonuclear Experiment Reactor (ITER) due to advantage of its lower erosion rate and longer life time. Optical emission spectroscopy coupled with a population kinetic model provides very effective route to plasma diagnostic. To extract basic plasma parameters viz. electron temperature, electron density and species populations an appropriate population kinetic model accounting the various population and depopulation mechanisms is needed. The accuracy of such approach highly depends upon the cross sections of various processes used in the model. We have developed CR models by incorporating our detailed fine structure excitation cross sections calculated by using fully relativistic distorted wave (RDW) theory for argon and krypton plasma. For tungsten ions, we have performed fully relativistic calculations to obtain the electron impact excitation cross-section for the transitions in Zr-like W34+ through Se-like W40+ ions in the light of wavelength measurements in the range 45-82�? carried out at electron beam ion trap at NIST. Different results along with the theoretical details will be presented.