Description ----------- Charge transfer recombination reactions. This table contains rate coefficients (in cm^3/s) for reactions of the form X^+n + He --> X^+(n-1) + He^+. We have fit all rate coefficients with the function adopted by Kingdon & Ferland (Astrophys. J. Suppl. 106, 205 (1996)), alpha(t4) = a*t4^b[1 + c*exp(d*t4)], where t4 is the temperature in units of 10^4 K, and a, b, c, and d are the parameters of the fit, with a in units of 10^-9 cm^3/s. In the table below, column 1 gives the reactant (parent) ion (X in the reaction above), columns 2-5 give the four fit parameters, columns 6 and 7 give the minimum and maximum temperature, respectively, over which the fit is valid. The last column is a note for the source of the data. Charge Transfer Rate Coefficients for He Targets --------------------------------------------------------------------- Ion a(10^-9 cm^3/s) b c d tlo thi Note --------------------------------------------------------------------- Li^2+ 1.01 -0.40 -0.79 -2.22e-3 1e+3 1e+7 1 Li^3+ 1.89e-1 2.90e-2 2.65 -0.18 1e+3 1e+7 1 Be^3+ 3.78 0.16 -0.54 -0.12 1e+3 1e+7 1 Be^4+ 8.10e-4 1.97 4.03e1 -1.06e1 1e+3 1e+5 1 Be^4+ 1.46e-1 0.66 -0.84 -9.08e-3 1e+5 1e+7 1 B^2+ 2.58e-2 8.44e-2 0.33 -0.27 1e+3 5e+5 1 B^2+ 7.59e-5 1.62 0.58 -0.49 5e+5 1e+7 1 B^3+ 1.60 0.33 -0.72 -1.67e-2 5e+3 1e+7 1 B^4+ 8.80e-4 1.94 3.93e1 -1.14e1 1e+3 1e+5 1 B^4+ 9.10e-2 0.73 -0.79 -1.14e-2 1e+5 1e+7 1 C^3+ 1.12 0.42 -0.69 -0.34 1e+3 1e+7 1 C^4+ 3.12e-7 -7.37e-2 3.50e1 2.40 1e+3 1e+4 1 C^4+ 1.49e-5 2.73 5.93 -8.74e-2 1e+4 3.5e+5 1 C^4+ 5.80e-2 0.73 -0.86 -9.60e-3 3.5e+5 1e+7 1 N^2+ 4.84e-1 0.92 2.37 -1.02e1 1e+3 4e+4 1 N^2+ 3.17 0.20 -0.72 -4.81e-2 4e+4 1e+7 1 N^3+ 2.05 0.23 -0.72 -0.19 1e+3 1e+7 1 N^4+ 1.26e-2 1.55 1.12e1 -7.82 1e+3 9e+4 1 N^4+ 3.75e-1 0.54 -0.82 -2.07e-2 9e+4 1e+7 1 O^2+ 7.10e-3 2.60 8.99 -0.78 1e+3 5e+4 1 O^2+ 6.21e-1 0.53 -0.66 -2.22e-2 5e+4 1e+7 1 O^3+ 1.12 0.42 -0.71 -1.98e-2 1e+3 1e+7 1 O^4+ 9.97e-1 0.40 -0.46 -0.35 1e+3 1e+7 1 F^2+ 1.00e-5 0.00 0.00 0.00 1e+3 1e+4 2 F^2+ 1.00e-5 3.00 -0.10 7.50e-2 1e+4 3.0e+5 1 F^2+ 3.24e-2 0.26 -1.00 -4.91 3e+5 1.0e+7 1 F^3+ 9.93e-2 1.02 -0.84 -0.80 1e+3 5.0e+4 1 F^3+ 4.48e-1 0.52 -0.79 -7.72e-2 5e+4 1.0e+7 1 F^4+ 4.50e-1 0.00 0.00 0.00 1e+3 2.0e+5 1 F^4+ 5.67e-2 0.76 1.34e1 -0.50 2e+5 1.0e+7 1 Ne^2+ 1.00e-5 0.00 0.00 0.00 1e+3 5e+3 3 Ne^2+ 8.48e-3 3.35 -1.92 -1.50 5e+3 8e+3 1 Ne^2+ 2.52e-2 0.14 -1.99 -0.91 8e+3 1e+7 1 Ne^3+ 1.00e-5 0.00 0.00 0.00 1e+3 2.5e+4 3 Ne^3+ 1.34e-4 2.33 -2.55 -0.37 2.5e+4 9.5e+4 1 Ne^3+ 1.00e-1 0.24 -1.09 -2.47e-2 9.5e+4 1e+7 1 Ne^4+ 1.77 0.14 4.88e-2 -3.35 1e+3 5e+4 1 Ne^4+ 2.67e-1 0.54 0.91 -1.88e-2 5e+4 1e+7 1 Na^2+ 5.98e-6 -0.29 1.34e-2 4.58 1e+3 2e+4 2 Na^2+ 1.30e-2 0.17 -1.38 -0.20 2e+4 1e+7 1 Na^3+ 1.00e-5 0.00 0.00 0.00 1e+3 5e+3 2 Na^3+ 3.64e-6 8.00 1.44e3 -2.96 5e+3 2e+4 1 Na^3+ 6.45e-2 0.20 -0.93 -3.83e-2 2e+4 1e+7 1 Na^4+ 3.97 0.13 -0.59 -0.13 1e+3 1e+7 1 Mg^3+ 1.88e-2 0.13 0.83 -4.94 1e+3 7e+3 1 Mg^3+ 3.41e-2 0.15 -0.45 -4.83e-2 7e+3 1e+7 1 Mg^4+ 1.37 0.21 -0.59 -5.94e-2 1e+3 1e+7 1 Al^3+ 1.53e-6 1.60e-2 -0.25 -9.71 1e+3 1e+7 1 Al^4+ 3.16 0.27 -0.64 -2.47e-2 1e+3 1e+7 1 Si^3+ 1.03 0.60 -0.61 -1.42 1e+2 1e+6 4 Si^4+ 5.75e-1 0.93 1.33 -0.29 1e+3 5e+5 5 P^3+ 8.75e-3 0.00 -0.23 -1.13e1 1e+3 1e+7 1 P^4+ 2.73 0.38 1.83 -7.01 1e+3 5e+5 1 S^3+ 3.58 7.77e-3 -0.94 -0.30 1e+3 3.1e+4 3 S^4+ 7.44e-4 0.34 3.74 -5.18 1e+3 3.1e+4 3 Cl^3+ 1.94e-1 0.98 -0.61 -1.02 1e+3 5e+4 1 Cl^3+ 1.69 0.38 -0.79 -2.43e-2 5e+4 1e+7 1 Cl^4+ 1.48 0.39 0.40 -0.13 1e+3 1e+7 1 Ar^2+ 1.30e-1 0.00 0.00 0.00 1e+3 3.1e+4 3 Ar^3+ 1.00e-5 0.00 0.00 0.00 1e+3 3.1e+4 3 Ar^4+ 9.72e-1 -0.14 1.05 -4.80 1e+3 1e+7 1 K^2+ 1.00e-5 0.00 0.00 0.00 1e+3 1e+4 2 K^2+ 1.43e-6 3.60 1.73e1 -0.14 1e+4 2e+5 1 K^2+ 1.67e-1 0.64 -0.96 -8.00e-3 2e+5 1e+7 1 K^3+ 1.00e-5 0.00 0.00 0.00 1e+3 3.3e+4 2 K^3+ 2.58e-7 3.01 5.90e1 -5.46 3.3e+4 3e+5 1 K^3+ 4.46e-3 0.94 -1.08 -5.08e-3 3e+5 1e+7 1 K^4+ 9.55e-1 0.11 0.11 -2.41 1e+3 7e+5 1 K^4+ 1.73e-1 0.52 1.08 -4.64 7e+5 1e+7 1 Ca^3+ 1.00e-5 0.00 0.00 0.00 1e+3 3e+4 2 Ca^3+ 2.61e-8 4.69 1.52e6 -4.65 3e+4 8e+4 1 Ca^3+ 1.96e-2 0.43 -1.09 -1.23e-2 8e+4 1e+7 1 Ca^4+ 5.21 0.24 -0.51 -6.43e-2 1e+3 1e+7 1 Sc^4+ 3.69 0.30 -0.58 -3.41e-2 1e+3 1e+7 1 Ti^3+ 1.00e-5 0.00 0.00 0.00 1e+3 1e+7 2 Ti^4+ 2.32e-1 0.90 2.76 -7.32 1e+3 7e+4 1 Ti^4+ 1.99 0.24 -0.74 -3.09e-2 7e+4 1e+7 1 V^3+ 2.56e-4 0.00 0.00 0.00 1e+3 1e+7 1 V^4+ 1.41 0.43 -0.64 -1.85e-2 1e+3 1e+7 1 Cr^3+ 7.40e-2 0.00 0.00 0.00 1e+3 1e+7 1 Cr^4+ 1.01 0.51 2.11 -2.31 1e+3 1e+7 1 Mn^3+ 4.28e-1 8.81e-2 -0.60 -0.22 1e+3 1e+7 1 Mn^4+ 9.71e-1 0.50 1.79 -0.62 1e+3 1e+7 1 Fe^3+ 3.05e-2 0.00 0.00 0.00 1e+3 1e+7 1 Fe^4+ 1.38 0.43 1.12 -0.16 1e+3 1e+7 1 Co^3+ 7.10e-1 0.19 0.63 -4.91e-3 1e+3 1e+7 1 Co^4+ 1.75 0.31 1.25 1.14e2 1e+3 1e+6 1 Co^4+ 7.14e3 -1.18 -1.25 -4.83e-3 1e+6 1e+7 1 Ni^3+ 1.59 0.26 -0.63 -0.19 1e+3 1e+6 1 Ni^3+ 4.05e3 -1.16 -1.25 -5.34e-3 1e+6 1e+7 1 Ni^4+ 2.96 0.29 -0.25 -0.13 1e+3 1e+7 1 Cu^3+ 6.40e-2 1.05 -0.92 -0.78 1e+3 9e+4 1 Cu^3+ 1.09 0.28 -0.85 -2.46e-2 9e+4 1e+7 1 Cu^4+ 2.27 0.33 -0.35 -4.33e-2 1e+3 1e+7 1 Zn^3+ 7.49e-2 0.51 -0.95 -1.20e-2 1e+3 1e+7 1 Zn^4+ 3.68 0.30 -0.55 -2.78e-2 1e+3 1e+7 1 -------------------------------------------------------------------- Charge transfer ionization reactions: He^+ + X -> He + X^+ Charge Transfer Rate Coefficients for He^+ on Neutral Targets --------------------------------------------------------------------- Neutral a(10^-9 cm^3/s) b c d tlo thi Note --------------------------------------------------------------------- Si 1.30 0.00 0.00 0.00 1e+1 1e+4 6 --------------------------------------------------------------------- Notes: 1. New multichannel Landau-Zener calculations, Wang et al. (2001) 2. Radiative charge transfer, Wang et al. (2001) 3. 2-channel Landau-Zener calculations, Butler & Dalgarno (1980, ApJ, 241, 838) 4. QMOCC, Stancil et al. (1999, J. Phys. B, 32, 1523) 5. QMOCC, Stancil et al. (1997, Phys. Rev. A, 55, 1064) 6. Estimate, 4/9*Langevin rate, Wang et al. (2001) Last modified: March 19, 2001.