“…Therefore, CH bond properties of alkane radical cations would differ from those of alcohols, ethers, and amine, in which the ejection from the nonbonding orbital of the heteroatom preferentially occurs in ionization and hyperconjugation with the nonbonding orbital plays a key role in the properties of the acidic CH bond. Alkane radical cations are often seen as precursors and reaction intermediates in synthetic chemistry, electrochemistry, radiation chemistry, and interstellar chemistry. − Therefore, microscopic level understanding of their properties would contribute to elucidate such chemical processes involving alkane cations. Alkanes have undergone photoelectron spectroscopy and theoretical investigations. − Low-energy features in their photoelectron spectra have been interpreted as ejection of an electron from delocalized orbitals through pseudo π orbitals (π-type orbitals) of CH bonds and σ orbitals of C–C bonds.…”