processes

Phelps database

Ar⁺ / Ar

Characteristic energy (D_x/K_o) (Tgas = 294.5 K) | Drift velocity: From Eq. B(9) of Z. Lj. Petrovic and A. V. Phelps, Plasma Sources Sci. Technol. 8, R21 (1999), the drift velocity W+ data is fit by W+ = 4.00 (E/n)/[1+(0.007*E/n)^1.5]^0.33 (m/s) where E/n is in Td. This formula is based on a review of published data and is somewhat different in detail from that of L. S. Frost, Phys. Rev. 105, 354 (1957). In addition to being fits to older data, the two ion mobility formulas suggested by A. L. Ward, J. Appl. Phys. 33, 2789 (1962) have the disadvantage that many models require switching between formulas in the middle of the calculation. Transverse diffusion coefficient: See the DT/mu data of T. Stefansson, Joint Symposium on Electron and Ion Swarms and Low Energy Electron Scattering, Trondheim, July 1991. I have not tried to fit this data with an empirical relation. The number of significant figures is determined by the digitizing software. The accuracy claimed is +- 5% for E/n < 1200 Td decreasing to +- 10% for E/n = 4000 Td. Note that his theoretical Ar+ - Ar scattering model yields DT/mu values only slightly above these values. Longitudinal diffusion coefficient: apparently, there are no published experimental values for DL*N or DL/mu for Ar+ in Ar. Formulas for estimating DL/mu for charge exchange dominated inteactions are given by H. R. Skullerud, J. Phys. B 2, 86 (1969). However, Mason and McDaniel, "The Mobility and Diffusion of Ions in Gases", (Wiley, 1973, New York), page 212 appear to correct a numerical error in Skullerud's Eq. (22). Updated: 17 April 2012.
Mobility (K_o) (Tgas = 300 K) | Drift velocity: From Eq. B(9) of Z. Lj. Petrovic and A. V. Phelps, Plasma Sources Sci. Technol. 8, R21 (1999), the drift velocity W+ data is fit by W+ = 4.00 (E/n)/[1+(0.007*E/n)^1.5]^0.33 (m/s) where E/n is in Td. This formula is based on a review of published data and is somewhat different in detail from that of L. S. Frost, Phys. Rev. 105, 354 (1957). In addition to being fits to older data, the two ion mobility formulas suggested by A. L. Ward, J. Appl. Phys. 33, 2789 (1962) have the disadvantage that many models require switching between formulas in the middle of the calculation. Transverse diffusion coefficient: See the DT/mu data of T. Stefansson, Joint Symposium on Electron and Ion Swarms and Low Energy Electron Scattering, Trondheim, July 1991. I have not tried to fit this data with an empirical relation. The number of significant figures is determined by the digitizing software. The accuracy claimed is +- 5% for E/n < 1200 Td decreasing to +- 10% for E/n = 4000 Td. Note that his theoretical Ar+ - Ar scattering model yields DT/mu values only slightly above these values. Longitudinal diffusion coefficient: apparently, there are no published experimental values for DL*N or DL/mu for Ar+ in Ar. Formulas for estimating DL/mu for charge exchange dominated inteactions are given by H. R. Skullerud, J. Phys. B 2, 86 (1969). However, Mason and McDaniel, "The Mobility and Diffusion of Ions in Gases", (Wiley, 1973, New York), page 212 appear to correct a numerical error in Skullerud's Eq. (22). Updated: 17 April 2012.
Mobility (K_o) (Tgas = 300 K) | The following Ar+ + Ar data are taken from A. V. Phelps, J. Phys. Chem. Ref. Data 20, 557 (1991). Table 8: Calculated drift velocities, steady-state energies and reaction coefficients for Ar+ in Ar. Updated: 13 September 2010.
Temperature (T_ion) (Tgas = 300 K) | The following Ar+ + Ar data are taken from A. V. Phelps, J. Phys. Chem. Ref. Data 20, 557 (1991). Table 8: Calculated drift velocities, steady-state energies and reaction coefficients for Ar+ in Ar. Updated: 13 September 2010.

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Phelps database

Ar⁺ / Ar

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Ar+ / Ar

Ar⁺ / Ar