Figure 2: Formation of the rotational envelope.
From: Site-selective photoemission from delocalized valence shells induced by molecular rotation
The rotational envelope of the v=3 vibrational sub-state (see Fig. 3) consists of a narrow Cl contribution (blue solid line) and a broad pedestal related to the H contribution (black solid line). The Cl contribution is formed by the P and R rotational branches related to the angular momentum transfer from the X-ray photon to the molecule, while the broad H band is mainly due to the angular momentum transfer from the fast photoelectron ejected from the hydrogen atom to the molecule.
