A novel expansion of the Thomas-Fermi potential for a weakly ionized atom is presented. It is employed in calculating the ionization energies of neutral atoms as they are predicted by an extended version of the Thomas-Fermi model which includes the exchange energy and the leading quantum correction. The ionization energy, I, can be split into a smooth part, /stat, that is here obtained by the s...

Relative measurements of the photoionization by line absorption in caesium vapor with and without foreign gases were made by the space-charge method. If the effect of a collision with a gas molecule is to change the probability of ionization from E to Ef, then the probability E v at a gas pressure p is given by E -Ev E -EfV^ Aa*T'pJ where A is a known constant, a is the distance between atom ce...

Ters faz sıvı kromatografi (RPLC) yöntemi asidik ve bazik fonksiyonel grup içeren bileşiklerin iyonlaşma/protonasyon (pKa) sabitlerinin tayini için tercih edilmektedir. pKa değeri, ilaçların absorpsiyon, dağılım, metabolizma, atılım, toksitite (ADMET) özelliklerini tahmin etmeye yarayan önemli bir parametredir. Sunulan bu çalışmada, pravastatinin su-asetonitril ikili karışımında değerinin RPLC ...

The applicability of high-resolution electrospray ionization mass spectrometry (HR ESI-MS) to measurements of the average oxygen to carbon ratio (O/C) in secondary organic aerosols (SOAs) was investigated. Solutions with known average O/C containing up to 10 standard compounds representative of low-molecular-weight SOA constituents were analyzed and the corresponding electrospray ionization eff...

We present time-dependent numerical hydrodynamic models of line-driven accretion disk winds in cataclysmic variable systems and calculate wind mass-loss rates and terminal velocities. The models are 2.5-dimensional, include an energy balance condition with radiative heating and cooling processes, and includes local ionization equilibrium introducing time dependence and spatial dependence on the...

background: in order to deliver the precise dose to the target in radiotherapy, absorbed dose to water at the reference point should be assessed. when the calibration procedure is performed for a reference dosimeter in the 60co beam of a secondary standard dosimetry laboratory (ssdl), the total uncertainty in absorbed dose to water (dw) is estimated to be approximately 1.5%. this study attempts...

The periodic changes in the physical and chemical properties of elements are caused by change ionization energies, which constant for each element that manifested Periodic Table. However, as has been recently shown modification electromagnetic field photonic crystals gives rise to electron mass. We show effect can significantly energy atoms placed voids consisting metamaterials with a highly tu...

A semitheoretical approach for the ionization constant of water, KW , is used to fit the available experimental data over wide ranges of density and temperature. Statistical thermodynamics is employed to formulate a number of contributions to the standard state chemical potential of the ionic hydration process. A sorption model is developed for calculating the inner-shell term, which accounts f...