What is the volume of a sigma bond?

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Yuri Mirgorod

Juan-Sebastián Gómez-Jeria

Calculate the volume of a methane molecule and divide this volume by 4. You will get an approximate volume sp3.

Jürgen Weippert

The answer to this question is highly definition-dependent. If you do not work with the old hybridization model, but instead the full MO set, you will get three σ orbitals in the valence, of which one is antibonding, not just one:

Article The Rotational Barrier in Ethane: A Molecular Orbital Study

The questions of definitions involve: do you only consider the σx orbital or also the σs and σs* into your consideration? Do you set the cutoff for the "end" of the orbital at an expected value of half the electron density, a quarter or less?