Azimuthal angular dependence of the K-x-ray emission in swift Ne7+-Ne collisions
In swift near symmetric heavy ion atom collisions the inner shell excitation is well described in the framework of electron promotion between quasi-molecular orbitals transiently formed during the collision process . For K-shell excitation the vacancy transfer via 2pπ-2pσ-rotational coupling plays a dominating role and yields a characteristic dependence of the 2pσ-vacancy production probability P2pσ(b) on the impact parameter (b). The conservation of angular momentum, where angular momentum of the nuclear motion is transfered into electronic angular momentum, creates a significant shape of P2pσ(b). Systematic experimental investigations [1,2] have shown nice agreement with theory [3,4]. Because of the rotational coupling mechanism the 2pσ-electron should be promoted only into the 2pπx-orbital (its angular momentum vector is perpendicular to the scattering plane). If all other 2pπ-states would be vacant, a subsequent x-ray emission from the 2pπx into the isotropic Is state should reflect by its dipole emission pattern directly this selective 2pπx-promotion.
- 3.K.Taulbjerg, J.S.Briggs, J.S.Vaaben J.Phys. B9 (1976) 170Google Scholar