نتایج جستجو برای: positron impact excitation
تعداد نتایج: 850785 فیلتر نتایج به سال:
The penetration of charged particles through matter is determined by the outcomes of countless Coulomb collisions with atoms and atomic electrons. It is a useful schematization to classify these collisions as soft and hard. Soft collisions, with impact parameters large compared to atomic dimensions are extremely numerous, and give rise to small energy losses and deflections. Hard collisions, wi...
Simple model for the resonant vibrational excitation of molecules and its application to Li2 and N2.
Wadehra JM, Drallos PJ. Simple model for the resonant vibrational excitation of molecules and its application to Li2 and N2. Phys. A simple model for the resonant vibrational excitation of a molecule by electron impact is proposed in which the potential curves of the electronic states of the molecule and its resonant anion are replaced by those of linear harmonic oscillators of arbitrary freque...
To solve the problem of resonance during quasi-static calibration of high-g accelerometers, we deduce the relationship between the minimum excitation pulse width and the resonant frequency of the calibrated accelerometer according to the second-order mathematical model of the accelerometer, and improve the quasi-static calibration theory. We establish a quasi-static calibration testing system, ...
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Abstract We calibrate the distorted wave Born approximation (DWBA) for electron impact excitation processes empirically. Differential cross sections (DCSs) for the excitation of the 2p53s, 2p53p, 2p54s and 2p54p configurations of Ne and the 3p54s and 3p54p configurations of Ar by electron impact are calculated using DWBA for incident energies between 20 and 100 eV. The calculated results are co...
Optogalavanic technique has been used widely in laser spectroscopy. In this paper we have presented the results of an experimental three- step photo- excitation of Gd atom, using optogalvanic technique. Three tunable dye laser pulses were applied to excite the Gd atom in a three-step photo – excitation process. The optogalvanic signal was used to monitor the laser wavelength and efficiency of...
Tumor hypoxia can be identified by [F]FAZA positron emission tomography, or invasively using oxygen probes. The impact of anesthetics on tumor hypoxia remains controversial. The aim of this comprehensive study was to investigate the impact of isoflurane and ketamine/xylazine anesthesia on [F]FAZA uptake and partial oxygen pressure (pO2) in carcinoma and muscle tissue of airand oxygen-breathing ...
چکیده ندارد.
Relativistic heavy ions are copious sources of virtual photons. The large photon flux gives rise to a substantial photonuclear interaction probability at impact parameters where no hadronic interactions can occur. Multiple photonuclear interactions in a single collision are possible. In this Letter, we use mutual Coulomb excitation of both nuclei as a tag for moderate-impact-parameter collision...
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