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Using the formula recently proposed, electron-impact ionization cross-sections for single ionization from the ground state of free atoms up toZ=108 are given for energies of the impact electron between threshold and 1 keV. The probable error is estimated to be approximately\(_{ - 30}^{ + 40} \% \), but near threshold the error is larger and no fine structures are accounted for.

An empirical formula with three free parameters is given for the representation of cross-sections for single ionization of atoms and ions from the ground state by electron-impact. Almost all experimental results can be approximated by this formula within 10% over the whole energy range between threshold and 10 keV; all experimental results can be approximated within experimental error. The formula proposed is not suitable to reproduce the exact contour of fine structures in the ionization cross-section curve.

Using the empirical formula recently proposed, electron-impact ionization cross-sections for single ionization from the ground state are given for free atoms and for all ionization stages from hydrogen to calcium (Z=20). Ionization rate coefficients are given for these species on the assumption of a Maxwellian distribution of the impacting electrons. Multiple ionization, lowering of ionization potential, or collision limit are not taken into account.

Using the empirical formula recently proposed, electron-impact ionization cross-sections for single ionization from the ground state are given for free atoms and for nearly all ionization stages from scandium (Z=21) to zinc (Z=30). For these species ionization rate coefficients are given under the assumption of a Maxwellian distribution of the impacting electrons. Multiple ionization, lowering of ionization potential, or collision limit are not taken into account.

Binding energies (ionization energies) of all subshells are given for free atoms up to Z = 108. X-ray data for solids have been combined with spectroscopic data and work functions, and have been smoothed, interpolated, and extrapolated.

Binding energies of electrons in all subshells of free atoms and of ions of all ionization stages of the elements hydrogen through zinc (Z = 30) are given with full regard to experimental values, in the sense that experimental values are preferred in all cases of doubt.

A complete set of ionization potentials of all ionization stages is given for the elements hydrogen through zinc (Z = 30). The ionization potentials are calculated along isoelectronic sequences with full regard to experimental values in the sense that experimental values are preferred in all cases of doubt. Along sequences that are well established experimentally the difference to the next higher species is calculated by interpolation or extrapolation of the second differences and the third differences. Sequences that are not so well established experimentally are calculated by interpolation or extrapolation of the difference to the same ionization stage of one of the better-known sequences. Similarities in the periodic table are taken into account.

Binding energies of electrons in the next inner subshell are given for most ionization stages of the elements boron through zinc (Z=30). The binding energies of (inner) 2s and 3s electrons are calculated along isoelectronic sequences with full regard to experimental values, in the sense that experimental values are preferred in all cases of doubt. Similarities in the periodic table are taken into account.