Total electron impact excitation cross sections of Ar and Kr

Abstract

A simple accurate method for normalizing the absolute magnitude of measured relative rare-gas excitation cross-section data to published measurements of the first Townsend coefficient is presented. Using a code which solved the Boltzmann equation we have determined that the predicted first Townsend coefficient is a very sensitive function of the electron impact excitation cross section. In Ar and Kr we have found that a 10% change in the cross section results in a 30% change in the first Townsend coefficient.

Investigation About Stepwise Excitation Cross Sections in Rare Gases

“…creasing of the cross section maximum may be observed in comparison to the Born approximation. It is to remark our set of stepwise excitation cross sections for argon has turned out to be suitable for the balance of the 2pk-and 3pk-levels in a high current hollow cathode aro discharge in argon Stepwise excitation cross section of the transition Ar (la, -2p,) according to (3) in comparison with the Born- [16] and Born-Bethe-npproximation Table 8 Stepwise excitation cross section values for the 2pk and 3 p k levels of argon…”

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

“…They are completed by the well-known calculations of the parameters concerning the inverse processes (Einstein B i j coefficients, see, e.g., the Appendix in Ashida et al [33], collisional deexcitations, calculated using the principle of detailed balancing, see, e.g., Lieberman Our results are in a very good agreement with those reported by these authors around 1 eV and lower. This is not the case for higher energies, because the empirical formulas recommended for the excitation values were meant for low-energy evaluations; the empirical formula A(T e ) B exp(−ΔE/T e ) as reported by Kannari et al [35], based on earlier work [36][37][38][39], constitutes a handy approximation valid for the low-energy region, but cannot describe the high-energy part of the rate for a Maxwellian distribution, as important theoretical and experimental work was not available at this time.…”

Kinetic theory of very high-frequency and high-pressure continuous atomic discharges

“…where the inelastic processes are treated as a single one with a cross-section equal to the total inelastic cross-section and a single electron energy loss u x ; the coefficient and (22) corresponds to the representation of the tangent, at the point u = u lt to the representative curve of £l_!&j(w). Computer calculations by Jacob & Mangano (1976) have demonstrated this procedure to be quite legitimate in rare gases. This model was also used by Ferreira & Ricard (1983) and Ferreira & Loureiro (1983) in their numerical approach (see the numerical representations (74) and (75) in §5.1).…”