[en] The atomic nuclear charge (Z) scaling for the dielectronic recombination (DR) rate coefficient (α) to the O⁴⁺, Ne⁶⁺, Mg⁸⁺, P¹¹⁺, Ar¹⁴⁺, Ca¹⁶⁺, V¹⁹⁺, Fe²²⁺ ions as well as the auger energy (ΔE), the radiative transition probability (Ar), and the autoionization rate (Aa) for the Be-like ions is studied. For the calculation of the energy levels, Ar, and Aa values, Cowan's code is employed. Not only the doubly excited 1s²2pnl states but also the 1s²3lnl'(l = s, p, d) are considered as the autoionization ones. In the DR processes, at low Z, only the 1s²2pnl → 1s²2snl and 1s²3pnl → 1s²2snl processes give a significant contribution. While, at high Z, the 1s²3s(or d)nl → 1s²2pnl and 1s²2pnl → 1s²2pn'l' processes also become important. The dielectronic recombination rate coefficient to the final excited 1s²2snl show weak Z-dependence, on the other hand, those to the final excited 1s²2pnl states have a strong Z-dependence. (author)

[en] Energy level(E), radiative transition probability(Ar), and autoionization rate(Aa) for Be-like Fe²²⁺ ion are calculated with use of Cowan's code. Using these atomic data, the dielectronic recombination rate coefficient(α) to the excited states and the intensity factor(Qd) of the dielectronic satellite lines have been calculated. The doubly excited states 1s²3lnl' as well as the 1s²2pnl of Fe²²⁺ ion are considered. The results are given in tables and figures. The n- and l-dependence for Ar, Aa, and α is studied. With use of it, Aa and Ar at large n are extrapolated. The dielectronic recombination processes from the 1s²2pnl and those from the 1s²3lnl' dominate at low and at high temperature, respectively. The qualitative different behaviors for E, Ar, and α between Be-like ions and He-like ions are discussed with use of atomic nuclear charge scaling. (author)

[en] We extend the study of the short wavelength X-ray emission from inner-shell excited states in high-density hot plasmas generated by high intensity laser irradiation on Xe clusters. We discuss the effects of electron densities and temperatures on the X-ray emission. The X-rays are emitted from the inner-shell excited state of highly charged ions (Xe³⁵⁺) only for the density of more than 3x10²³ cm^-3 and temperature of more than 5 keV though this density is much larger than that simulated by Ditmire et al. [Phys. Rev. A 53 (1996) 3379]. The X-ray intensity depends on the life-time of the inner-shell excited states

[en] A radial dose simulation model has been proposed in order to advance the treatment planning system for heavy particle cancer therapy. Here, the radial dose is the dose due to the irradiation of a heavy ion as a function of distances from this ion path. The model proposed here may overcome weak points of paradigms that are employed to produce the conventional radial dose distributions. To provide the radial dose with higher accuracy, this paper has discussed the relationship between the emission angles of secondary electrons and the radial dose. It is found that the effect of emission angles becomes stronger on the radial dose with increasing energies of the secondary electrons.

[en] This paper presents a theoretical study of the DNA damage due to the effect of the composite electric fields of H₂O⁺ ions produced from the irradiation of a heavy ion onto a cell. A model for atomic and molecular processes in strong electric fields is developed. It is found that the composite electric fields increase the number of the events of electron impact ionization processes. (author)

[en] The present simulation demonstrates the energy loss of each individual secondary electron due to the composite electric field formed from molecular ions. Both of the secondary electron and molecular ions are produced from an incident ion impact ionization process. The initial conditions of the secondary electron under which this electron is trapped near the trajectory are found for a proton and a carbon ion

[en] In this paper, electron impact ionization processes are incorporated in our Monte Carlo (MC) code for the calculation of the damage of the bio-molecules by the irradiation of x-ray free electron lasers (XFELs). The study of this damage is useful for the analysis of three-dimensional structure of the bio-molecules using x-ray free electron lasers because the damage appears as a noise for this analysis. The x-ray absorption and Compton scattering processes take place after the x-rays irradiate the target. Then, an electron is ionized from atoms and moves in the target. This electron also gives rise to an electron impact ionization process for the other atoms or ions. It is assumed that electron impact ionization processes occur only when the electrons cross a cross section, which is located at the place of the atomic nucleus and is perpendicular to the direction of the electron velocity. The x-ray flux, wavelength, and pulses of XFEL light pulses treated here are 10^20-21/pulse/mm², 10 fs, and 0.1 nm, respectively. We compare the frequencies of photo-electron impact ionization processes calculated by our MC code with those by rate equations. The relationship of these frequencies with shapes of targets using various ellipsoids as a target is discussed. (author)

[en] The dielectronic recombination (DR) processes of Be-like C, O, Mg, P, V, and Fe ions are studied. The doubly excited states 1s²3lnl''(l=s,p,d) as well as 1s²2pnl are considered as the autoionization ones. The final excited states are 1s²2snl and 1s²2pnl states. At low Z, only the 1s²2pnl → 1s²2snl and 1s²3pnl → 1s²2snl processes give a significant contribution to the DR process. While, at high Z, the 1s²3dnl → 1s²2pnl and 1s²2pnl → 1s²2pn''l'' processes also become important. The processes to the final excited 1s²2snl show weak Z-dependence, on the other hand, those to the final excited 1s²2pnl has a strong Z-dependence. (author)

[en] We have calculated FeXXIII spectral lines by using collisional-radiative model for Fe²²⁺ ion including levels with principal quantum number up to 50. We take into account the recombination processes from Fe²³⁺ ion which has not been studied in detail before. We calculate the dielectronic recombination rate coefficients to include them to the model. Using the model, we study the line intensities and the intensity ratios as a function of an electron temperature at an electron density of 10¹⁴ cm^-3 assuming an ion abundance ratio of Fe²³⁺ ion to Fe²²⁺ ion. The satellite lines and the radiative loss by Fe²²⁺ ion are also examined. (author)

[en] In this paper, electron impact ionization processes are incorporated in our Monte Carlo (MC) code for the calculation of the damage of the Bio-Molecules by the irradiation of X-Ray free electron lasers (XFELs). The study of this damage is useful for the analysis of three-dimensional structure of the Bio-Molecules using X-Ray free electron lasers because the damage appears as a noise for this analysis. The X-Ray absorption and Compton scattering processes take place after the X-Rays irradiate the target. Then, an electron is produced from atoms and moves in the target. This electron also gives rise to an electron impact ionization process for the other atoms or ions. It is assumed that electron impact ionization processes occur only when the electrons cross a cross section, which is located at the place of the atomic nucleus and is perpendicular to the direction of the electron velocity. The X-Ray flux, wavelength, and pulses of XFEL light pulses treated here are 10^20-21 /pulse/mm², 0.1 nm, and 10 fs, respectively. We compare the frequencies of photo-electron impact ionization processes calculated by our MC code with those by rate equations. The relationship of these frequencies with shapes of targets using various ellipsoids as a target is discussed. (author)