نتایج جستجو برای: ionization potential
تعداد نتایج: 1101370 فیلتر نتایج به سال:
Strong field photoelectron holography has been proposed as a means for interrogating the spatial and temporal information of electrons and ions in a dynamic system. After ionization, part of the electron wave packet may directly go to the detector (the reference wave), while another part may be driven back and scatters off the ion(the signal wave). The interference hologram of the two waves may...
Photoelectron spectroscopy and ab initio calculations employing a nonequilibrium polarizable continuum model were employed for determining the vertical ionization potential of aqueous protonated imidazole. The experimental value of 8.96 eV is in in excellent agreement with calculations, which also perform quantitatively for ionization of aqueous alkali cations as benchmark species. The present ...
Surface Penning ionization (SPI) in the process He*(2lS, 23S) + CO + He(llS) + CO+ + eis investigated theoretically for CO molecules chemisorbed on a Pd(ll1) surface at low collision energy of metastable He*-beams. The actual process can well be explained in terms of Auger deexcitation. The entire SPI process occurs at the topmost layer, thereby increasing the surface sensitivity. The potential...
Radiative recombination transitions into the ground state of cooled bare and hydrogenlike uranium ions were measured at the storage ring ESR. By comparing the corresponding x-ray centroid energies, this technique allows for a direct measurement of the electron-electron contribution to the ionization potential in the heaviest He-like ions. For the two-electron contribution to the ionization pote...
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 structure of glycine, alanine, serine and cysteine radical cations, as well as their Ca–R fragmentations have been studied at the B3LYP/6-31CCG(d,p) level of theory. For all systems the loss of COOH is found to be the most favourable process. However, when R1 size increases, fragmentations that lead to R1 % or R1 start become competitive. The energy of a Ca–R fragmentation can be related to...
We present a systematic study of the molecular-frame photo-electron angular distributions produced by multiphoton double ionization of H2 using circularly polarized 800 nm, femtosecond laser pulses. We compare experimental results to numerical results obtained from a reduced-dimensionality time-dependent Schrödinger equation (TDSE) model. In addition, we implement a TDSE-like version of the str...
Resonance ionization laser ion sources (RILIS) are applied for the production of exotic ion beams with high isotopic and isobaric purity [1], limited only by surface ionization of unwanted atomic species. A new type of resonance ionization laser ion source is presently being deve-loped and tested at the RISIKO mass separator at Mainz University [2] for future use at on-line radioactive ion beam...
The ionization dynamics of an aminopyridine dimer (AP)(2) has been investigated by means of the direct ab initio molecular dynamics (MD) method. It was found that the reaction process was composed of three steps after the vertical ionization of (AP)(2): dimer approach, proton transfer and energy relaxation. The timescales of these processes were 50-100, 10-20, and 200 fs, respectively. The time...
Combined data of photoelectron spectra and photoionization efficiency curves in the near threshold ionization region of isolated ion pairs from [emim][Tf(2)N], [emim][Pf(2)N], and [dmpim][Tf(2)N] ionic liquid vapors reveal small shifts in the ionization energies of ion-pair systems due to cation and anion substitutions. Shifts toward higher binding energy following anion substitution are attrib...
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