1s sigma molecular orbital ionisation in asymmetric ion-atom collisions by direct Coulomb interaction

K X-ray production by 12C4+ ion impact on selected elements

“…In particular, the production of K X-rays by heavy ions (such as 12 C or 16 O) was studied by several authors (Gray et al, 1976;Wheeler et al, 1976;Knaf et al, 1977;Zelazny and Hornshoj, 1984;Paul and Muhr, 1986;Geretschla¨ger and Benka, 1986;Geretschla¨ger et al, 1990;Geretschla¨ger et al, 1992;Fazinic et al, 1996;Tong et al, 1996;Sun et al, 1996;Mitra et al, 1997;Kubala-Kukus et al, 1999;Ozafra´n et al, 2003). Nevertheless, the development of theoretical models that describe and predict the X-ray production cross sections by heavy ion impact has not seen a strong advancement in the past 10 years, at least (Montenegro and Sigaud, 1985;Benka et al, 1987). Existing theories are focused on K lines rather than to L or M lines, while the symmetry in the collisions is an important factor within the models.…”

“…In contrast, Montenegro and Sigaud (1985) developed analytical expressions for computing the ionization cross sections through adiabatic perturbations, which they called a direct MO model. In the adiabatic limit, the ionization is predominant at internuclear distances smaller than the K-shell radius.…”

L-shell X-ray production of molybdenum and niobium induced by 1500–3500keV Xe26+ ions

“…In this model, the inner-shell electron will be ionized from the united-atom state [18][19][20]. Hence, for the present experiment, the theoretical production cross sections values will be calculated in the united-atom limit by using the bindingenergy-modified BEA model, within the quasi-molecular frame.…”

Target and projectile K x-ray production by 100, 160, and 200 MeV Nb collisions with thick solid targets

“…[1]), while data for heavier collision systems is rather limited [2]. In this investigation we test generally accepted theories of K vacancy production for collision systems involving heavier ions.…”

“…In particular, K-shell ionization has been studied extensively for light [1] and heavy projectiles [2], at both low [3] and relativistic velocities [4]. However, even today, a complete theory that can predict K-vacancy production cross-sections for all collision systems, based on first principles, is still lacking [5].…”