Projectile Charge and Velocity Dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>-Subshell Ionization Cross Section Ratios for Heavy Elements

Li, T.K.; Clark, D. L.; Greenlees, G.W.

doi:10.1103/physrevlett.37.1209

Cited by 48 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the L2 subshell, however, the ECPSSR theory underpredicts the experimental results by a factor of more than 4 near the lowest bombarding energy with a ratio of 3•81 ± O' 51 over the entire range. Similar deviations for the L2 shell have been observed for some time for He+ bombardment of heavy nuclei, although usually for higher bombarding energies (> 1'0 MeV) (Chang et al 1975;Li et al 1976;Sarkadi and Mukoyama 1980). For Au (Table 3), if we compare the mean of the thick and thin target results, the Uexp/Ulheory ratios obtained are similar to those for W for L3 and Ltot (1, 30±0'05 and 1• 37 ±0•13 respectively).…”

Section: Discussionsupporting

confidence: 71%

L-subshell X-ray Production by 100?250 keV/a.m.u. Ions

Harrigan¹,

Spicer²,

Cohen³

1984

Aust. J. Phys.

View full text Add to dashboard Cite

Individual L-subshell ionization cross sections have been measured for bombardment of 100-200 keY H+ ions in 10 keY steps upon a thick Gd (Z = 64) target and for bombardment of 600-1000 keY He+ ions in 100 keY steps upon thick W (Z = 74) and thick and thin Au (Z = 79) targets. Experimental results for the individual L subshells are compared with the theoretical predictions of the ECPSSR theory as developed by Brandt and Lapicki. The differences are discussed as a function of the reduCi:,d ion velocity. The occurrence of collision induced intra-shell transitions is discussed as a possible source for the discrepancy between experiment and theory.

show abstract

Section: Discussionsupporting

confidence: 71%

L-subshell X-ray Production by 100?250 keV/a.m.u. Ions

Harrigan¹,

Spicer²,

Cohen³

1984

Aust. J. Phys.

View full text Add to dashboard Cite

show abstract

“…9 in Ref. [36]) and heavier ions [50] or shows up as a minimum in L 1 / L 2 ratios measured with protons and heavier ions [51]. Since Gray and his earlier co-workers saw no discernable plateau in L␥ 23 x-ray production by oxygen ions in the same 0.5-2 MeV/ u range on six other elements [19], Shingal et al [52] attempted to explain these facts with target-centered coupled channel calculations by fully stripped heavy ions.…”

Section: Ecusar Hencementioning

confidence: 87%

Effects of multiple ionization and intrashell coupling inL-subshell ionization by heavy ions

et al. 2004

View full text Add to dashboard Cite

L-subshell ionization cross sections are extracted from measured L␣, L␤, L␥, L␥ 1 , L␥ 23 , and L␥ 44 x-ray production cross sections in thin targets of 75 Re, 78 Pt, and 79 Au bombarded by 4 -8 MeV C 3+ ions. For each projectile energy, using the fluorescence and Coster-Kronig yields recently recommended by Campbell with an amendment for multiple ionization effects, a mutually consistent set of ionization cross sections is extracted from L␣ and six pairs of other L-line x-ray production cross sections. Extracted L 1 -, L 2 -, L 3 -ionization cross sections are compared with the predictions of the ECPSSR theory-which accounts for the energy ͑E͒ loss and Coulomb ͑C͒ deflection of the projectile as well as for perturbed-stationary state (PSS) and relativistic ͑R͒ nature of L subshells-and its modification, ECUSAR-IS. In the ECUSAR-IS theory, the PSS effect is calculated with a united and separated atom (USA) treatment and the intrashell (IS) coupling is accounted for by multiplicative factors of Sarkadi and Mukoyama normalized so that the sum of L-subshell ECUSAR-IS cross sections equals ECUSAR L-shell ionization cross section without the IS correction. Further improvement of this theory to account for better wave functions in its evaluation is made by scaling it with ratios of DiracHartree-Slater cross sections to the screened hydrogenic formulas used in the ECPSSR theory. Very good agreement is obtained with L 2 and L 3 ionization data. For the L 1 subshell, the data are in good agreement with the ECPSSR theory but are by factors of 2 to 3 above the results of its modifications.

show abstract

“…In a recent work Padhi et al (1995) studied the ionization of the L subshell of Au and Bi through the impact of B ions in the energy range 0.48-0.88 MeV amu −1 . Their goal was to investigate further the anomalies which have been found in previous L-shell ionization works using heavy projectile ions (Li et al 1976, Sarkadi and Mukoyama 1980, Jitschin et al 1983a, b, 1985, Pálinkás et al 1983, Berinde et al 1984, Papp et al 1984, Dexheimer et al 1986, Kambara et al 1989, Semaniak et al 1994, Dhal et al 1995a. In these works large deviations (up to one order of magnitude in some cases) were observed between the measured cross section values (subshell cross section ratios) and the predictions of the first-order ionization theories.…”

Section: Introductionmentioning

confidence: 94%

Investigation of the vacancy sharing process in L-shell ionization of gold and bismuth by boron ions

Sarkadi

Mukoyama

Šmit

1996

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

Coupled-states calculations have been made to interpret the L-subshell ionization cross section data measured by Padhi et al for collisions of B ions with Au and Bi in the energy range 0.48-0.88 MeV amu −1 . The calculated cross sections are in a reasonable agreement with the measured values. It has been shown that simple static Stark mixing of the target 2s and 2p atomic wavefunctions is inadequate for the description of the ionization process, and the dynamical treatment of the subshell couplings based on the solution of the coupled equations of the problem is necessary for the satisfactory description of the process.

show abstract

Projectile Charge and Velocity Dependence ofL-Subshell Ionization Cross Section Ratios for Heavy Elements

Cited by 48 publications

References 10 publications

L-subshell X-ray Production by 100?250 keV/a.m.u. Ions

L-subshell X-ray Production by 100?250 keV/a.m.u. Ions

Effects of multiple ionization and intrashell coupling inL-subshell ionization by heavy ions

Investigation of the vacancy sharing process in L-shell ionization of gold and bismuth by boron ions

Contact Info

Product

Resources

About