The kinetic Boltzmann equation is used to model the non-equilibrium ionization phase that initiates the evolution of atomic clusters irradiated with single pulses of intense vacuum ultraviolet radiation. The duration of the pulses is ≤ 50 fs and their intensity in the focus is ≤ 10 14 W/cm 2. This statistical model includes various processes contributing to the sample dynamics at this particula...

We report the first quantitative phase-sensitive measurement of ultrafast ionization rates in gases. Ultrafast probe depletion via frequency mixing in the ionization front is observed. The detailed dynamics of an atom in a strong laser field is rich in both interesting physics and potential applications. The source of both high-harmonic WVW-XW radiation [1] and ionization-based sources of tunab...

Ionizing radiation exposure can induce profound changes in intracellular components, potentially leading to diverse health effects in exposed individuals. Any cellular component can be damaged by radiation, but some components affect cellular viability more profoundly than others. The ionization caused by radiation lasts longer than the initial inciting incident, continuing as 1 ionization inci...

The gravitational ionization of a Keplerian binary system via normally incident periodic gravitational radiation of definite helicity is discussed. The periodic orbits of the planar tidal equation are investigated on the basis of degenerate continuation theory. The relevance of the KolmogorovArnold-Moser theory to the question of gravitational ionization is elucidated, and it is conjectured tha...

Radiation damage observed on a number of cables in the storage ring has triggered a series of radiation measurements inside the storage ring to assess dose levels during injection and during stored beam conditions. Photon dose rates have been measured in different locations, using small ionization chambers. The results show a strong spatial variation of the measured dose rates and indicate that...

Experimental results are presented from an experiment in which ionization created by a highenergy x-ray synchrotron radiation beam intersecting an ethylene diffusion flame is measured.The ionization signal is believed to arise from x-ray absorption by aggregated soot particles.Comparisons are made between these ionization profiles and those due to natural flameionization. Visibl...

-Two parallel-plate ionization chambers were projected, constructed and evauated for use in high energy electron beams. They were constructed using the two plastic materials recommended for clinical dosimetry protocols, i.e. acrylic and polystyrene. Both chambers have cylindrical shape with entrance windows in aluminized Mylar and they are open to the air. The acrylic chamber has a 2 mm air gap...

As part of the database for building up a biochemical model of DNA radiation damage, electron impact ionization cross sections of sugar-phosphate backbone and DNA bases have been calculated using the improved binary-encounter dipole (iBED) model. It is found that the total ionization cross sections of C3’and C5’-deoxyribose-phosphate, two conformers of the sugar-phosphate backbone, are close to...

The first sources of ionizing radiation to condense out of the dark and neutral IGM sent ionization fronts sweeping outward through their surroundings, overtaking other condensed objects and photoevaporating them. This feedback of universal reionization on cosmic structure formation is demonstrated here by gas dynamical simulations, including radiative transfer, for a cosmological minihalo of d...