Calculation of fully relativistic cross sections for electron excitation of cesium atom and its application to the diagnostics of hydrogen-cesium plasma. (January 2017)

• Record Type: Journal Article
• Authors: Priti, ; Dipti, ; Gangwar, R.K.; Srivastava, R.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 187(2017)
• Page Start: 426
• Page End: 442
• Publication Date: 2017-01
• Subjects: Electron impact excitation -- Cross-sections -- Relativistic distorted wave theory -- Hydrogen-cesium plasma and collisional radiative model; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2016.10.020
• Languages: English
• ISSNs: 0022-4073

Abstract

Abstract: Electron impact excitation cross-sections and rate coefficients have been calculated using fully relativistic distorted wave theory for several fine-structure transitions from the ground as well as excited states of cesium atom in the wide range of incident electron energy. These processes play dominant role in low pressure hydrogen-cesium plasma, which is relevant to the negative ion based neutral beam injectors for the ITER project. As an application, the calculated detailed cross-sections are used to construct a reliable collisional radiative (CR) model to characterize the hydrogen-cesium plasma. Other processes such as radiative population transfer, electron impact ionization and mutual neutralization of Cs + ion with negative hydrogen ion along with their reverse processes are also taken into account. The calculated cross-sections and the extracted plasma parameters from the present model are compared with the available experimental and theoretical results. Highlights: Relativistic distorted wave theory is used to calculate the electron-impact excitation of cesium . Electron impact excitation rate-coefficients are calculated as a function of electron temperature . A collisional radiative (CR) model has been developed using the obtained cross-sections and the characterization of the hydrogen-cesium plasma has been done .