Regular threshold-energy increase with charge for neutral-particle emission in collisions of electrons with oligonucleotide anions.
نویسندگان
چکیده
Electron-DNA anion collisions were studied using an electrostatic storage ring with a merging electron-beam technique. The rate of neutral particles emitted in collisions started to increase from definite threshold energies, which increased regularly with ion charges in steps of about 10 eV. These threshold energies were almost independent of the length and sequence of DNA, but depended strongly on the ion charges. Neutral particles came from breaks of DNAs, rather than electron detachment. The step of the threshold energy increase approximately agreed with the plasmon excitation energy. It is deduced that plasmon excitation is closely related to the reaction mechanism.
منابع مشابه
Symmetric versus asymmetric collisions in ion-induced Auger emission from silicon
We investigate the production of Si 2p Auger electrons during bombardment of Si surfaces by 1.0-5.1 keV Ar+ ions. Yields of Auger electrons emitted at 146 a with respect to the ion beam are measured as a function of ion energy. We observe a threshold of 3.8 keV for formation of a double L vacancy in Si, which is due to Ar-Si collisions. This value is higher than those of previous studies, which...
متن کاملResonant neutral-particle emission in collisions of electrons with peptide ions in a storage ring.
Electron-biomolecular ion collisions were studied using an electrostatic storage ring with a merging beam technique for singly protonated peptides (angiotensin I, II, and III). A strong neutral-particle emission at around 6.5 eV was found in addition to neutrals from recombination at low energies. The rates of the high-energy peak greatly decreased with a slight decrease in the number of amino-...
متن کاملThe Role of Secondary Electrons in Low Pressure RF Glow Discharge
We concerned on the role of secondary electrons in low pressure rf glow discharge. The Particle in Cell/Monte Carlo computer simulations (PIC/MC) was applied to simulate the discharge. The influence of secondary electron emission yield (SEY) on the plasma density was studied. Furthermore the relative density and the electron energy probability function of secondary particles, i.e., secondary el...
متن کاملQSAR relationships The changes in the ratio of electrons to the natural charge of atoms in the complexes of glycine and alanine amino acids with intermediates
In this paper, the quantum chemistry calculations related to the structural parameter of the three anions and the resulting complexes with glycine and alanine have been performed. The calculations were carried out using the HF and DFT method and in the base series 6-31G *. Natural Transplantation Orbital (NBO), hybrid capacity for bindings and is obtained. The ratio of the internal electrons, V...
متن کاملComparison of hybrid Hall thruster model to experimental measurements
A two-dimensional hybrid particle-in-cell numerical model has been constructed in the radial-axial plane with the intent of examining the physics governing Hall thruster operation. The electrons are treated as a magnetized quasi-one-dimensional fluid and the ions are treated as collisionless, unmagnetized discrete particles. The anomalously high electron conductivity experimentally observed in ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 93 4 شماره
صفحات -
تاریخ انتشار 2004