Quasimolecular KX-ray excitation by bombarding As, Zr, Nb, Mo and Rh target with Nb ions

The anisotropy of the MO-2p?-radiation observed in symmetric heavy ion collisions

“…These authors showed that the anisotropies reach a maximum at an X-ray energy which can only be explained by transitions into the 2p a-minimum. Evidence for the quasimolecular nature of this continuum also is given by the fact that the Dopplershift-determined following the method of Meyerhof et al [1][2][3][4][5]-is due to the center-of-mass-motion of the colliding system. In our measurements described below we determined the energies of the peak centroids of the 2p a-aniso- tropies in five symmetric systems in order to investigate the Z-dependence of the effect.…”

“…This radiation has been interpreted as being due the transitions into the minimum of the 2pa-orbital [2]. This latter continuum was denoted C1 and the lsa-continuum C2 by Gippner et al [2]. This notation has also been used in the insertion of Figure 1.…”

“…The X-ray continuum is composed of two parts: a high energy-continuum-extending up to energies above the united atom K-limit-which can be attributed to MO-lsa-radiation [1] and a more steeply decreasing low energy part which does not fit into the quasiatomic picture since it reaches energies which are much higher than the united atom L-limit. This radiation has been interpreted as being due the transitions into the minimum of the 2pa-orbital [2]. This latter continuum was denoted C1 and the lsa-continuum C2 by Gippner et al [2].…”

Theory of the angular distribution of 2p? molecular orbital X-rays

“…In heavy-ion-atom collisions two distinct continua have been observed beyond the projectile and target K X-ray lines [1,2]. The higher energy continuum, stretching at least to the position of the united-(projectile+target) atom K~ and Kfi X-ray lines, has been identified as l sa molecular orbital (MO) Xrays, electronic transitions to vacancies in the l sa MO occurring during the collision.…”

“…Recently, Stoller et al [4] (and others [5,6]) measured the angular distribution of 2pa MO X-rays. (1) where da(O, Ex)/dE x is the MO X-ray production cross section measured at an angle 0 from the beam direction at an X-ray energy Ex, is sharply peaked at E~ =Epeak =(1.5 +0.04) UK, where U K is the separatedatom K-shell binding energy. Their experiments were done with Fe, Ge, Br, Nb, and Ag ions.…”