Energy systematics of single and doubleK-shell-vacancy production in titanium bombarded by chlorine ions

Abstract

The energy systematics of single and double K-shell-vacancy production in titanium have been investigated near the limit of zero target thickness for incident chlorine ions over an energy range of 7 -15 MeV/amu. Single and double K-shell-vacancy production cross sections have been measured for projectiles incident with zero, one, and two initial K-shell vacancies. Single and double K-shellto-E-shell electron-transfer cross sections have been obtained indirectly using differencing procedures based on the projectile-charge-state dependence of single and double K-shell-vacancy production. The measured cross sections have been compared to theoretical models for direct ionization and inner-shell electron transfer. Together with previously reported data, these cross sections also have been used to investigate the relative importance of these mechanisms for K-shell-vacancy production in heavy-ionatom collisions over a range of scaled velocities of 0.24 (Vl /V2K & 1.29.

K-K-electron transfer andK-shell-vacancy production cross sections for Ti bombarded bySi28andTribedi1, Prasad2, Tandon3 1993Phys. Rev. A231140View full textAdd to dashboardCite

“…A similar constant value (0.27) of cox for Ti using a Cl beam was reported by Tanis et al [7]. The co+ values as estimated by Hall and co-workers [8,9,22], from the available high-resolution x-ray data of Sc induced by heavy ions, are about 10% lower with respect to our values. All the x-ray production cross-section (o xx) data were converted to ionization cross sections (axl) by using the measured value of~z which was found to be independent of target thickness and the initial charge states of the beam.…”

“…5 (here the subscripts 1 and 2 refer to the projectile and the target, respectively) while the agreement becomes progressively worse as Z, /Z2 approaches unity, even when v, /v2x =0.3 (v, is the projectile velocity and v2x the mean velocity of the target K electrons). The relative importance of direct ionization and electron transfer in K-shell ionization by heavy ions has been extensively investigated for Ti bombarded with a number of heavy ion beams up to Cl and over a wide energy range of 0.5 to 6.5 MeV/amu [8,9]. These investigations show that direct ionization plays a dominant role for the asymmetric collision system (Zi/Z2 +0.…”

“…The existing data for Ti with various ion beams in Refs. [8,9] are for a vanishing thin (about 1 pg/cm ) target though the thickness variations were not investigated. We report in this work systematic measurements of single and double E-K-electron transfer and the E-shell-vacancy production cross sections in nearly symmetric collision systems of Ti bombarded by Si (Z, /Z2=0.…”

Double-K-shell ionization of Mg and Si induced in collisions with C and Ne ions

“…For not completely stripped projectiles, however, single-electron capture probabilities can be assumed to be proportional to the number of electrons in the projectile's K shell. This dependence of the capture cross section on the projectile's charge has already been confirmed [6][7][8].…”

“…A detailed investigation of the relative importance of the two main ionization mechanisms has been made for Ti bombarded by heavy ions by Hall et al [6,7]. A similar experimental procedure has also been used by Tribedi et al [8] to obtain double-K-shell ionization and electron transfer cross sections for Fe and Ni targets.…”