The spectral distribution of intermediate L-K molecular-orbital radiation in symmetric heavy-ion collisions

Abstract

Two distinct X-ray continuaC1 and C2 above the characteristic lines are observed in high-energy collisions between atoms with atomic numbers of 28 to 57. This structure is explained by a superposition of K molecular-orbital (KMO) radiation and of an intermediate L-K molecular-orbital (ILKMO) radiation of high intensity which is due to 2p sigma vacancies. In the framework of the dynamical theory of intermediate molecular phenomena and using a scaling of the H2 + correlation diagram with screened state-dependent charges good agreement between the shapes of the measured and calculated spectra is obtained.

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

“…Similarly the lower energy, rapidly falling continuum has been identified as 2pa MO X-rays. Calculations of the 1 sa and 2pa MO X-ray production cross sections are in good agreement with experiment [2,3]. Recently, Stoller et al [4] (and others [5,6]) measured the angular distribution of 2pa MO X-rays.…”

“…Our calculations include, for the first time, the Coriolis coupling between both the 2ptr and 2pn MOs and the 3do, 3dn, and 3d6 MOs. For high X-ray energies, calculations including electron-slip predict smaller MO X-ray intensities than previous calculations that neglected the electron slip [2,3,13]. The continuum spectrum observed above the 2pa MO Xray spectrum in asymmetric collisions and in collisions with gaeous targets where the two-collision lsa MO X-ray intensity is small [-17, 12], are probably not 2per-line tails, though our calculations are not sufficiently accurate to ascertain this.…”

“…The anisotropy of MO X-ray emission is calculated from the A 0 parameter The essential difference between this calculation of 2pa MO X-rays and previous ones [2,3,12,13] is the consistent inclusion of electron slip, Eqs. (2)- (5).…”

Emission of X-ray continua by bombardment of thick Al, Si and Ti targets with protons and14N ions

“…For the asymmetric diatomic systems considered here this radiation should arise in the target materials by adiabatic collisions between recoil atoms and atoms at rest [15]. Using the formulae given by Heinig et al [16] we constructed the correlation diagrams of the (neutral) collision systems Si + Si and Ti+Ti by scaling the H~ diagrams with state dependent screened nuclear charges. We further calculated the maximum recoil energies and distances of closest approach for the secondary collision partners Si +Si and Ti +Ti as a function of the projectile energy.…”

Impact Parameter Dependence of K‐Shell Vacancy Production in Collisions of 1 MeV/a. m. u. Cu lons with Cu, Ge and Ag Atoms

“…The theoretical curve was calculated using a coinputer code of JAGER [24], written for homonuclear collisions, and a scaling according to TAULBJERG et al [13] for Cu-Ge and Cu-Ag systems. The theoretical valnes should be multiplied by a factor v, the nuinber of vacancies in the 2 p z z orbital created prior to the collision or in the early stage of the same collision.…”