摘要:

The radial dose distribution from delta rays, fundamental to the delta ray theory of track structure, is recalculated. We now include the model of Rudd for the secondary electron spectrum in proton collisions. We include the effects of electron transmission through matter and the angular dependence of secondary electron emission. Empirical formulas for electron range versus electron energy are intercompared in a wide variety of materials in order to extend the track structure theory to arbitrary media. Radial dose calculations for carbon, water, silicon, and gold are discussed. As in the past, effective charge is used to scale to heavier projectiles. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50083

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

The elastic scattering model in the calculations of the double differential cross sections of the binary encounter electrons is described for fast ion collisions with light targets. There is an excellent agreement between theory and experiment when the electron exchange contribution is included in the calculations. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50084

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Auger electron spectra and Auger yields of free argon clusters in the Ar(2p) excitation regime are reported. The Auger yield spectra show characteristic changes as a function of cluster size. The results indicate that the Auger yield signal originates primarily from the surface of the clusters. The results are compared to bulk‐sensitive experimental techniques, such as total electron yields (TEY), zero kinetic energy electron (ZEKE) spectra for variable size clusters, as well as Auger yield spectra of condensed argon multilayers. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50085

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Explorations of the classical phase space for ion collisions with Rydberg atom targets provide insight into mechanisms for ionization and charge transfer. Thomas’s analysis of charge transfer at high impact energies [Proc. Roy. Soc. London114, 561 (1927)] is extended here to intermediate‐ and low‐energy ??? and ionization processes through numerical integration of the classical equations of motion. Parameter space maps correlating initial conditions with final outcomes have well‐defined zones corresponding to Thomas capture, direct capture, binary encounter ionization, saddle‐point ionization, and ionization bySsuperpromotion. The relative contributions to charge transfer (or ionization) cross sections from these distinct classical collision channels are qualitatively interpreted by analysis of the parameter space maps. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50086

出版商:AIP    

年代:1996

数据来源: AIP