J/A+AS/133/257 J/A+AS/133/257 Recombination coefficients for NeII lines R Kisielius P J Storey A R Davey L T Neale Astron. Astrophys. Suppl. Ser. 133 257 1998 1998A&AS..133..257K VI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995) Atomic physics atomic data HII regions planetary nebulae: general We calculate total recombination coefficients for Ne^2+^ + e^-^ and effective recombination coefficients for the formation of selected lines of Ne II. New photoionization data are calculated which accurately map the near threshold resonances and are used to derive recombination coefficients for principal quantum numbers, n<=15, including radiative and dielectronic recombination. Cascading from higher states is included, allowing for the effects of finite electron density in a hydrogenic approximation. The effects of population in the excited states of the recombining ion are investigated.

Config Electronic configuration --- Term State term --- Epresent Present calculation energy of term Ry Eexperimental Experimental energy of term Ry T Electron temperature K Case Plasma state case number=1 In Case A, all emission lines are assumed to be optically thin. In Case B, lines terminating on the ^2^P^o^ term are assumed to be thick and no radiative decays to this state arte permitted when calculating the population structure. See Baker & Menzel, (1938ApJ....88...52B) for more details. --- RC2 Recombination coefficients at N_e_=10^2^cm^-3^ 10-12cm3/s RC4 Recombination coefficients at N_e_=10^4^cm^-3^ 10-12cm3/s RC5 Recombination coefficients at N_e_=10^5^cm^-3^ 10-12cm3/s RC6 Recombination coefficients at N_e_=10^6^cm^-3^ 10-12cm3/s SP1 2S+1 of upper state parent term --- LP1 L of upper state parent term --- PP1 Parity of upper state parent term number=1 0 for even, 1 for odd --- n1 Principal quantum number of outer electron --- l1 Orbital quantum number of outer electron --- S1 2S+1 of upper state term --- L1 L of upper state term --- P1 Parity of upper state term number=1 0 for even, 1 for odd --- SP2 2S+1 of lower state parent term --- LP2 L of lower state parent term --- PP2 Parity of lower state parent term number=1 0 for even, 1 for odd --- n2 Principal quantum number of outer electron --- l2 Orbital quantum number of outer electron --- S2 2S+1 of lower state term --- L2 L of lower state term --- P2 Parity of lower state term number=1 0 for even, 1 for odd --- Case Plasma state case number=2 In Case A, all emission lines are assumed to be optically thin. In Case B, lines terminating on the ^2^P^o^ term are assumed to be thick and no radiative decays to this state arte permitted when calculating the population structure. See Baker & Menzel, (1938ApJ....88...52B) for more details. --- lambda Transition wavelength in nm nm ECR1 Te= 1000K effective recombination coefficient 10-14cm3/s ECR2 Te= 2000K effective recombination coefficient 10-14cm3/s ECR3 Te= 3000K effective recombination coefficient 10-14cm3/s ECR5 Te= 5000K effective recombination coefficient 10-14cm3/s ECR75 Te=75000K effective recombination coefficient 10-14cm3/s ECR100 Te=10000K effective recombination coefficient 10-14cm3/s ECR125 Te=12500K effective recombination coefficient 10-14cm3/s ECR150 Te=15000K effective recombination coefficient 10-14cm3/s ECR200 Te=20000K effective recombination coefficient 10-14cm3/s SP1 2S+1 of upper state parent term --- LP1 L of upper state parent term --- PP1 Parity of upper state parent term number=1 0 for even, 1 for odd --- n1 Principal quantum number of outer electron --- l1 Orbital quantum number of outer electron --- S1 2S+1 of upper state term --- L1 L of upper state term --- P1 Parity of upper state term number=1 0 for even, 1 for odd --- SP2 2S+1 of lower state parent term --- LP2 L of lower state parent term --- PP2 Parity of lower state parent term number=1 0 for even, 1 for odd --- n2 Principal quantum number of outer electron --- l2 Orbital quantum number of outer electron --- S2 2S+1 of lower state term --- L2 L of lower state term --- P2 Parity of lower state term number=1 0 for even, 1 for odd --- Case Plasma state case number=2 In Case A, all emission lines are assumed to be optically thin. In Case B, lines terminating on the ^2^P^o^ term are assumed to be thick and no radiative decays to this state arte permitted when calculating the population structure. See Baker & Menzel, (1938ApJ....88...52B) for more details. --- Lambda Transition wavelength in nm nm a Fitting coefficient a number=3 Fit parameters and maximum deviations from the calculated data are given for the effective recombination coefficients at N_e_=10^4^cm^-3^. The coefficients are fitted by a least-squares algorithm to the functional form: {alpha}_eff_=10^-14^*at^f^(1+b(1-t)+c(1-t)^2^+d(1-t)^3^), where t=T_e_[K]/10^4^, and a, b, c, d and f are constants. Fitting is valid for the whole temperature range studied for all lines except those denoted by asterisk in the last column. 10-14cm3/s b Fitting coefficient b number=3 Fit parameters and maximum deviations from the calculated data are given for the effective recombination coefficients at N_e_=10^4^cm^-3^. The coefficients are fitted by a least-squares algorithm to the functional form: {alpha}_eff_=10^-14^*at^f^(1+b(1-t)+c(1-t)^2^+d(1-t)^3^), where t=T_e_[K]/10^4^, and a, b, c, d and f are constants. Fitting is valid for the whole temperature range studied for all lines except those denoted by asterisk in the last column. 10-14cm3/s c Fitting coefficient c number=3 Fit parameters and maximum deviations from the calculated data are given for the effective recombination coefficients at N_e_=10^4^cm^-3^. The coefficients are fitted by a least-squares algorithm to the functional form: {alpha}_eff_=10^-14^*at^f^(1+b(1-t)+c(1-t)^2^+d(1-t)^3^), where t=T_e_[K]/10^4^, and a, b, c, d and f are constants. Fitting is valid for the whole temperature range studied for all lines except those denoted by asterisk in the last column. 10-14cm3/s d Fitting coefficient d number=3 Fit parameters and maximum deviations from the calculated data are given for the effective recombination coefficients at N_e_=10^4^cm^-3^. The coefficients are fitted by a least-squares algorithm to the functional form: {alpha}_eff_=10^-14^*at^f^(1+b(1-t)+c(1-t)^2^+d(1-t)^3^), where t=T_e_[K]/10^4^, and a, b, c, d and f are constants. Fitting is valid for the whole temperature range studied for all lines except those denoted by asterisk in the last column. 10-14cm3/s f Fitting coefficient f number=3 Fit parameters and maximum deviations from the calculated data are given for the effective recombination coefficients at N_e_=10^4^cm^-3^. The coefficients are fitted by a least-squares algorithm to the functional form: {alpha}_eff_=10^-14^*at^f^(1+b(1-t)+c(1-t)^2^+d(1-t)^3^), where t=T_e_[K]/10^4^, and a, b, c, d and f are constants. Fitting is valid for the whole temperature range studied for all lines except those denoted by asterisk in the last column. 10-14cm3/s FitErr Maximum fitting error (in percent) % Note Asterisks denote line for which fitting is valid from T_e_=2000K. --- Trans Transition multiplet --- Si 2S+1 of upper term --- Li L of upper term --- --- --- Ji J of upper term --- Sf 2S+1 of lower term --- Lf L of lower term --- --- --- Jf J of lower term --- Lambda Wavelength of transition line nm b(Ji,Jf) Splitting factor b(Ji,Jf) defined by Eq.(10). --- Patricia Bauer CDS 1998Jul02Dr. Romas Kisielius <rk@aura.phys.ucl.ac.uk> J_A+AS_133_257.xml