Preliminary Discussion - The second section provides the background information concerning the nature of the hyperfine orbitals in the resurrected theory, and thereafter, the development of the quantum number status et al, of these orbitals themselves.

Hyperfine Transitions - The nature of electron transitions, including their unique Selection Rules, between the hyperfine orbitals within an orbit shell, is explored in the third Section. It is shown that the only such transition that exists, is that in the first orbit shell to produce the 21.1cm spectral line in inter-stellar hydrogen.
Details of the permitted additional electron inter-shell transitions, again including the extension to their Selection Rules, resulting from the additional hyperfine orbitals, is also included in this Section.

Mathematical Representation - The fourth Section provides the mathematical theory that predicts the 21.1cm specral line in inter-stellar hydrogen. It is shown that no new analysis is required, because the final orbital energy equation developed in the previous paper to this one, already contains the hyperfine orbital energy variations.

Conclusions - The concluding remarks cover the both hyperfine variations development, and the status of the overall resurrected theory, as presented in this series of papers.

Appendix A - The first Appendix provides calculated emission spectra for the hyperfine transitions, and an updated tabularisation of the fine structure spectra. A downloadable spreadsheet is included containing all such calculations for review and analysis as desired.

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