Swift ion

Our particular interest lies in the calculation of the linear energy deposition, or stopping power, of swift ions in materials, 5o(v). In the first Born approximation, and for a fully stripped projectile, this quantity can be written [2-4]... 

SWIFT) Ion Excitation in Trapped-Ion Mass Spectrometry Theory and Applications. Int. J. Mass Spectrom. Ion Proc. 1996,157/158, 5-37. 

Over the years, Jens Oddershede has written extensively on various aspects of energy deposition by swift ions in material targets. In many cases, he has been concerned with the orientational effects of target molecules with respect to the projectile beam direction, and has explained these differences in the context of the relevant oscillator strength distribution of the target [1-8]. It is in the spirit of Jens work that we carried out this study of the orientational aspects of the energy deposition by swift protons in water, and we report them now in celebration of his the-third-times-twentieth birthday. 

R. Cabrera-TmjiUo and J. R. Sabin (eds.) Theory of the Interaction of Swift Ions with Matter. Part I. Advances in Quantum Chemistry, Elsevier, Amsterdam, 2004. 

SWIFT excitation affords another method of resonance selection or ejection and has been applied in ICP-IT-MS by C. I. Frum to effect both ion isolation and collision-induced dissociation of ions sampled from an ICP [58]. An example of the isolation of 142Ce from a mixture containing all the lanthanide isotopes is shown in Fig. 9.14. In the absence of SWIFT excitation (Fig. 9.14a) space charge effects on both the lanthanides and Y+ are evident (space charge for Th+ is reduced by the prior ejection of lighter ions during the mass scan). Space charge effects are eliminated on application of SWIFT ion isolation. 

During irradiation by swift ions, latent ion tracks are formed along the path of the ions. After irradiation, the material is subjected to chemical treatment leading to formation of the hollow channel from the latent ion track. The size and shape of the etched ion track is determined by the chemical processing. The etch process depends on the energy deposition density of the ion along its path, on the radiation... 

High energy radiation exists under many forms, but the most important types for the potential applications they have in polymer science and technology are X-rays and gamma rays on the one hand, and accelerated electrons on the other. The recent development of swift ion beam accelerators that induce reactions exhibiting some common features with widespread radiation treatments cited at first will be also accounted for. 

During the past decade, there has been a revitalization of theoretical interest in energy deposition. This interest has been supported by the availability of extensive computational resources and stimulated by new and more accurate measurement techniques, so that details of the interactions between swift ions and materials can now be both measured and computed. 

The final problem that we will discuss here refers to a basic aspect of the interaction of swift ions with solids, which is the relation between the charge state of ions moving inside a solid and the effective charge values deduced from stopping power measurements. This question has been analyzed recently in Refs. [49,50], based on different non-linear models and reaching similar results. Hence, the approach provides a convenient framework to clarify some seeming contradictions which have been under discussion for many years. 

THEORY OF THE INTERACTION OF SWIFT IONS WITH MATTER. PART 1... 

Abstract The effects of energy transfer from swift ion radiation to biomolecules are... 

The summary of these studies [5-10] reviewed here is that the amino acids and the nucleic acids all have similar properties with regard to absorption of energy from swift ions. All of fhe biomolecules reported here, including water, have mean excitation energies in the neighborhood of 70 eV. Thus, neither malevolent nor therapeutic radiation would be expected to preferentially interact with any particular class of biomolecules. 

S. Bruun-Ghalbia, S.P.A. Sauer, J. Oddershede, J.R. Sabin, Comparison of the Directional Characteristics of Swift Ion Excitation for Two Small Biomolecules Glycine and Alanine, Eur. Phys. J. D 60 (2010) 71. 

J.R. Sabin, J. Oddershede, Status of the Calculation of the Energy Loss of Swift Ions in Molecules, Nucl. Inst. Meth. B 64 (1992) 678. 

The time dependent variational principle is used to study energy deposition by swift ions in material targets. One important aspect of this process is charge exchange between the projectile and the target in single collisions. Preliminary results are reported for the model system He2+ — Ne. 

R. Cabrera-Trujillo, E. Deumens, Y. Ohrn and J.R. Sabin, Impact parameter dependence of electronic and nuclear energy loss of swift ions H+ — He and H+ — H, Nucl. Instrum. Methods, B168 (2000) 484. 

Apel P. Swift ion effects in polymers Industrial applications. Nucl Instrum Methods Phys... 

Rothard, H. 2004. Track formation and electron emission in swift ion collisions with condensed matter. Radiotherapy and Oncology, 73(Suppl. 2) S105-S109. 

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