Abstract
K-, L andM-shell ionization cross sections have been measured for 23 elements, 12≦Z≦92, after bombardment with relativistic electrons, 15≦E 065MeV, by means of high resolution semiconductor detectors and a recently developed gas-scintillation proportional counter. For constant electron bombarding energyE 0 the ionization cross sections follow a power law dependence,σ∽Z −α, and forE 0=50MeV we deducedα =2.45±0.02 for theK shell andα=3.00 ±0.09 for theL shell. The observedZ dependence exhibits significant systematic deviations from theoretical predictions which exceed the experimental values up to 15 % at lowZ elements for theK shell and on the average about 11% for theL andM shell. The same behaviour of too low experimental values, i.e. an overestimation by the theory, is observed for the energy dependence of the cross sections for all shells. A scaling behaviour describing theZ andE 0 dependence for allK-, L andM-shell data points is observed which also predicts the experimental values by other groups at lower and higher energies correctly. The comparsion of the measuredLΒ/Lα, andLγ/Lα intensity ratios for highZ elements with the values obtained by other groups in the energy range 0.3≦E0≦1,000 MeV exhibits an increase with bombarding energy that cannot merely be explained by the energy dependence of the subshellionization cross sections for theL shell. An attempt to explain this effect with the change of the Coster-Kronig transition probability is described.
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Middleman, L.M., Ford, R.L., Hofstadter, R.: Phys. Rev. A2, 1429 (1970)
Ishii, K., Kamiya, M., Sera, K., Morita, S., Tawara, H., Oyamada, M., Chu, T.C.: Phys. Rev. A15, 906 (1977)
Hoffmann, D.H.H., Genz, H., Löw, W., Richter, A.: Phys. Lett.65 A, 304 (1978)
Jaruis, O.N., Whitehead, C., Shah, M.: Phys. Rev. A5, 1198 (1972)
Anholt, R., Nagamiya, S., Rasmussen, J.O., Bowman, H., Ioannou, J.G., Rauscher, E.: Phys. Rev. A14, 2103 (1976)
Anholt, R., Ioannou, J., Bowman, H., Rauscher, E., Nagamiya, S., Rasmussen, J.O., Shibita, T., Ejiri, H.: Phys. Lett.59 A, 429 (1977)
Madison, D.H., Merzbacher, E.: Atomic inner-shell process. (B. Crasemann, ed.) p. 1. New York: Academic Press 1975
Quarles, C.A.: Electronic and atomic collisions. IX ICPEAC (J.F. Risley and R. Geballe, eds.) p. 898. Seattle: University of Washington Press 1975
Morita, S.: Int. Conf. Inner Shell Ionization Phenomena. (R. Brenn and W. Mehlhorn, eds.) p. 339. Freiburg: University Press 1976
Powell, C.J.: Rev. Mod. Phys.48, 33 (1976)
Tawara, H.: Electronic and atomic collisions. X ICPEAC (G. Watel ed.) p. 311. Amsterdam: North Holland 1978
Kolbenstvedt, H.: J. Appl. Phys.38, 4785 (1967);46, 2771 (1975)
Scofield, J.H.: Phys. Rev. A18, 963 (1978)
Fermi, E.: Phys. Rev.57, 485 (1940)
Crispin, A., Fowler, G.N.: Rev. Mod. Phys.42, 290 (1970)
Dangerfield, G.R., Spicer, B.M.: J. Physik B8, 1744 (1975)
Hink, W., Ziegler, A.: Z. Physik226, 222 (1969)
Bambynek, W., Crasemann, B., Fink, R.W., Freund, H.U., Mark, H., Swift, C.D., Price, R.E., Rao, P.V.: Rev. Mod. Phys.44, 716 (1973)
GrÄf, H.D., Miska, H., Spamer, E., Titze, O., Walcher, Th.: Nucl. Instr. and Meth.153, 9 (1978)
Walcher, Th., Frey, R., GrÄf, H.D., Spamer, E., Theissen, H.: Nucl. Instrum. Methods.153, 17 (1978)
Schüll, D., Foh, J., GrÄf, H.D., Miska, H., Schneider, R., Spamer, E., Theissen, H., Titze, O., Walcher, Th.: Nucl. Instrum. Methods.153, 29 (1978)
Foh, J., Frey, R., Schüll, D., Schwierczinski, A., Theissen, H., Titze, O.: Nucl. Instrum. Methods.153, 43 (1978)
Conde, C.A.N., Policarpo, A.J.P.L.: Nucl. Instrum. Methods.53, 7 (1967)
Müller, S.: Staatsexamensarbeit, Technische Hochschule Darmstadt 1978 (unpublished)
Brendel, C.: Diplomarbeit, Technische Hochschule Darmstadt 1979 (unpublished)
Krause, M.O., Nestor, C.W., Sparks, C.I. Ricci, E.: ORNL-5399, Distribution Category UC-4. US Dept. of Commerce, National Technical Information Center 1978
Fink, R.W., Rao, P.V.: ORO-3346-202 (1977) (unpublished)
Scofield, J.H.: Lawrence Livermore Laboratory Report. UCLR-51326 (1973)
Scholz, W., Li-Scholz, A., Collé, R., Preiss, I.L.: Phys. Rev. Lett.29, 761 (1972)
Seif el Nasr, S.A.H., Berenyi, D., Bibock, G.: Z. Phys.267, 169 (1974)
Davis, D.V., Mistry, V.D., Quarles, C.A.: Phys. Lett.38 A, 169 (1972)
Schlenk, B., Berenyi, D., Ricz, S., Valek, A., Hock, G.: J. Physik B10, 1303 (1977)
Kamiya, M., Kuwako, A., Kinefuchi, Y., Ishii, K., Morita, S., Oyamada, M.: Res. Report Lab. Nucl. Science, Tohoku Univ.12, 100 (1979)
Perlman, H.S.: Proc. Phys. Soc. (London)76, 623 (1960)
Anholt, R.: Phys. Rev. A19, 1004 (1979)
Bethe, H.: Ann. Phys. (Leibzig)5, 325 (1930)
Quarles, C.A.: Phys. Rev. A13, 1278 (1976)
Annegarn, H.J., Madiba, C.C., Sellschop, J.P.F., Genz, H., Hoffmann, D.H.H., Löw, W., Richter, A., van Grieken, R.E.: Phys. Rev. C16, 379 (1977)
Hoffmann, D.H.H, Brendel, C., Löw, W.: To be published
Mehlhorn, W.: Phys. Lett.26 A, 166 (1968)
Berezhko, E.G., Kabachnik, N.M.: J. Physik B10, 2467 (1977)
Cleff, B., Mehlhorn, W.: Phys. Lett.37 A, 3 (1971)
Sandner, W., Schmitt, W.: J. Physik B11, 1833 (1978)
Doebelin, E., Sandner, W., Mehlhorn, W.: Phys. Lett.49 A, 7 (1974)
Salem, S.I., Clark, D.C., Tsutsui, R.T.: Phys. Rev. A5, 2390 (1972)
McCrary, J.H., Singmann, L.V., Ziegler, L.H., Loomey, L.O., Edmonds, C.M., Harris, C.E.: Phys. Rev. A5, 1587 (1972)
Chen, J.R., Reber, J.D., Ellis, D.J., Miller, T.E.: Phys. Rev. A13, 941 (1976)
Scofield, J.H.: Phys. Rev. A10, 1507 (1974)
Park, Y.K., Smith, M.T., Scholz, W.: Phys. Rev. A12, 1358 (1975)
Genz, H., Hoffmann, D.H.H., Löw, W., Richter, A.: Phys. Lett.73A, 313 (1979)
Heinrichs, H., Klein, U., Müller, G., Piel, H., Proch, D., Weingarten, W., Genz, H., GrÄf, H.D., Grundey, T., Richter, A., Spamer, E.: Design of a proposed 130 MeV superconducting recyclotron for electrons, in: Lecture Notes in Physics Berlin, Heidelberg, New York: Springer 1979 Vol. 108, 176, 1979
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Work supported by Deutsche Forschungsgemeinschaft
We are grateful to P. Eschwey, B. Fricke and K.O. Groneveld for many useful discussions and suggestions, to W. Bambynek for the preparation of the uranium target and to H.U. Freund for the55Fe and109Cd sources and his assistance during the development of the X-ray fluorescence method. We also thank E. Spanier for the preparation of excellent accelerator beams.
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Hoffmann, D.H.H., Brendel, C., Genz, H. et al. Inner-shell ionization by relativistic electron impact. Z Physik A 293, 187–201 (1979). https://doi.org/10.1007/BF01435588
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DOI: https://doi.org/10.1007/BF01435588