Hydrogen Collisions Research Articles

Errata: Experimental Results on Charge-Changing Collisions of Hydrogen and Helium Atoms and Ions at Kinetic Energies above 0.2 kev

Errata: Experimental Results on Charge-Changing Collisions of Hydrogen and Helium Atoms and Ions at Kinetic Energies above 0.2 kev

Experimental Results on Charge-Changing Collisions of Hydrogen and Helium Atoms and Ions at Kinetic Energies above 0.2 kev

Experimental results on charge-changing collisions of hydrogen and helinum are reviewed. Theoretical attempts to compute the charge-changing cross sections are not discussed, but a list of theoretical papers is given as a separate bibliography. (W.D.M.)

On the detection of microwave spectral lines in radio astronomy.

On the detection of microwave spectral lines in radio astronomy.

The Detachment of Electrons from Negative Hydrogen Ions by impact with Neutral Atoms

Born's approximation is applied to calculate the cross section for detachment of an electron from a negative ion of hydrogen in collision with a helium atom as a function of the energy of the ion. The results are compared with observed data and show agreement to within a factor of two or so over an energy range from 100 to 20 000 eV.

SLOW π-MESONS IN COSMIC-RAY STARS AND THE NEGATIVE–POSITIVE π-MESON RATIO

In a survey of mesons ending in the emulsion no τ- or κ-mesons have been observed so far. The variation of the negative–positive π-meson ratio with energy shows up the effect of the Coulomb barrier on π-meson production at very low energies. The variations of this ratio at mountain and balloon altitudes are discussed. Examples have been obtained of the emission of slow π-mesons in hydrogen collisions in the emulsion, and also in energetic stars with several shower particles and few evaporation particles.

Proton Production by Electron Collisions in Molecular Hydrogen

The collision processes leading to the production of protons by single electron collisions with molecular hydrogen were investigated. A mass spectrometer was used for the analysis. The electron beam, along which ions were produced, was coaxial with a cylindrical conductor, and the radial field within this conductor due to the electron space charge was used as an energy selector for the ions. The ions measured were those moving initially at right angles to the electron beam. The "fast" protons (ions having several electron volts of energy) found by Bleakney were observed, and a rough measurement of the cross section for their production was made. The cross section was found to reach a maximum of about 0.015 ${\mathrm{cm}}^{2}$/${\mathrm{cm}}^{3}$ for 110-volt electrons. No evidence was found for the slow protons observed by Bleakney. It is believed that these were formed by secondary collision processes. From the theory developed by Smith, it is possible to compute roughly the initial energy distribution of the ions. The distributions are in accord with the potential energy curves of the hydrogen molecule..

XXXVI. The ionization by collision of hydrogen, nitrogen and argon

XXXVI. <i>The ionization by collision of hydrogen, nitrogen and argon</i>

Societies and Academies

Societies and Academies