منابع مشابه
Ionization and positronium formation in noble gases
Absolute measurements are presented for the positron-impact cross sections for direct ionization and positronium formation of noble gas atoms in the range of energies from threshold to 90 eV. The experiment uses a cold, trap-based positron beam and the technique of studying positron scattering in a strong magnetic field. The current data show generally good, quantitative agreement with previous...
متن کاملStrong-field double ionization of rare gases.
We have studied the double ionization of helium and other rare gases using an electron-ion coincidence technique. With this scheme, the electron energy spectrum correlated to the creation of a doubly charged ion may be compiled. In all cases, the observed double ionization electron distributions are similar and enhanced at high energies, while the single ionization spectra exhibit distinct diff...
متن کاملHigher-order Kerr terms allow ionization-free filamentation in gases.
We show that higher-order nonlinear indices (n(4), n(6), n(8), n(10)) provide the main defocusing contribution to self-channeling of ultrashort laser pulses in air and argon at 800 nm, in contrast with the previously accepted mechanism of filamentation where plasma was considered as the dominant defocusing process. Their consideration allows us to reproduce experimentally observed intensities a...
متن کاملPhysics: F. Zwicky Ionization in Gases by Ions and Atoms
It has been assumed for a long time that the ionization of atoms by ions must in one form or another play an important r6le in the phenomena of gas discharges. This assumption found its mathematical expression in the well-known theory of Townsend. Only recently, however, have the elementary effects of the ionization by ions been experimentally investigated. The ionization of noble gas atoms by ...
متن کاملIonization defect for alpha particles in various gases
The ionization produced by the Li7* and o<-particles from the reaction BlO(njo<)Li7* as they were stopped in argonj argon-nitrogen~ and argoncarbon dioxide gas mixtures was measured. A gridded parallel-plate ionization chamber employing electron collection was used. Plutonium alpha particles were used for calibration and the ionization electron pulses were amplified and sorted-with an electroni...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1925
ISSN: 0031-899X
DOI: 10.1103/physrev.26.633