By Lewis D. (ed.)
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4 × 10−4 % and almost 100 % for the isotope 4 H e. m. 647 × 10−24 g. The natural occurrence of helium in the Earth crust is 8 × 10−7 . The helium atom in the ground state 1 S contains two 1s-electrons. Lower excited states of the helium atom with the electron shell 1s2s are metastable. 616 eV. 56 ns. 38, and the radiative lifetime with respect to transition in the ground state is τ = 5 ns. 0 nm. 98 ns relates to this transition. e. 988 cm−1 . Spectrum of the helium atom is given in Fig. 7, and spectrum for indicated states of the helium atom is represented in Fig.
In reality other excitation states may partake in this process if their excitation energy is below the electron energy and also excitation states with a higher excitation energies through resonances in electron-atom interaction. As a result, the excitation cross section has a not smooth dependence on the electron energy, as it follows from the example given in Fig. 5 where the excitation cross section of an argon atom by electron impact is represented near the threshold. From this threshold law it follows that the rate constant of quenching of an excited atom by electron impact kq is independent of the electron energy in the limit of low electron energies.
6ao for e − Ar scattering [119, 120], where ao = 2 /(m e e2 ) is the Bohr radius. We note that determination of the electron scattering length L on the basis of the Schrödinger equation is not reliable even with using contemporary computer methods. Therefore information about the scattering lengths follow from direct and indirect experiments. 2) where r is a distance of the scattering electron from the atom center. e. the wave function of a scattering electron is entangled with the wave functions of atomic electrons, and a resultant exchange interaction has a complex form.