4s− 4pelectron collision excitation of the Ar I

Argon 4sand 4pExcited States Atomic Data Applied in ARC-JET Modeling

“…Experimental results were also obtained in the University of Ioannina [8] and compared to previous results described in the paper "Important Atomic Spectra" contained in the "American Institute of Physics Handbook" [9]. The excitation cross section evaluations of the GL to the 4s and 4p levels of Ar I and of 4s to 4p ones were based on calculations with various types of approximations-Distorted Wave (DW), born, relativistic distorted wave (RDW) and first order many body theory (FOMBT)-in comparison with the existing experiments and with results from quasiclassical formulas [3,4,10,11]. The latter were initially proposed by Drawin [12], both for the electron collision ionization and for the excitation of the neutral atoms, on the basis of previous studies by Gryziński [13] of the three-body problem.…”

“…As was explained previously, the Ar(4s) configuration is formed in four levels, two metastable and two transitory. In a first approximation, they are assembled in a sole level for which a collective reaction rate was evaluated as a weighted average of the separate transitions of the multiplet, evaluated by Katsonis and Berenguer [10,11]. The same approach was used for the Ar(4p) configuration, consisting of ten levels.…”