Solid Carbon Targets Research Articles

Collisional Atomic Physics with Molecular Projectiles

Many collisional atomic physics processes are altered when solid targets are bombarded by molecular, compared to atomic, projectiles. We present energy and angular distribution measurements of exiting particles when 50-300 keV H+2 and HeH+ molecules are incident on thin (1.8-5 ?g/cm2) solid carbon targets. We find that the ratio of molecular to atomic projectile energy loss is velocity and transit time dependent, and ranges from ~ 0.8 to 1.3. The energy distribution of the exiting charged, neutral, and molecular particles are compared and found to be consistent with the assumption that protons of a velocity ? v0 do not have bound states while moving in solids.

Analysis of experimental velocity distributions of convoy electrons

Abstract Available data on the properties of velocity distributions of electrons accompanying ions in the velocity range from 1 to 5 au emerging from gas and solid carbon targets, for incident H+ and H+2 beams, are presented in a consistent manner and compared with the theories of charge transfer to the continuum and of electrons in wake riding states trailing ions in solids.

Continuous electron energy spectra ejected from solid carbon targets bombarded with light and heavy ions

Energy distributions of electrons were measured under an observation angle of 42.3° by bombarding thin carbon foils with protons of 0.5 to 2.5 MeV and with Neon of 10 MeV energies. Comparison of the experimental results with binary-encounter-approximation calculations, taking into account the electron energy loss in the solid, show that the spectra from proton bombardment can be described by this model.

X-ray emission from a CO2-laser-produced plasma

A 0.3-GW, 60-ns TEA CO2 laser has been used to create plasma from a solid carbon target. Studies of the x-ray emission from the plasma at 4×1011 W/cm2 indicate the existence of a high-energy electron component with an equivalent temperature of ∼ 2 keV.