Electron-electron interaction in projectile ionization investigated by high resolution recoil ion momentum spectroscopy

Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

“…With the development of Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) [7,8], the sensitivity at which theoretical models can be tested has been significantly enhanced.…”

Search for isotope effects in projectile and target ionization in swiftHe+onH2orD2Trinter1, Waitz2, Schöffler3 et al. 2014Phys. Rev. ASelf Cite2010View full textAdd to dashboardCite

“…In our experiment we use the COLTRIMS (Cold Target Recoil Ion Momentum Spectroscopy) technique [19][20][21] to examine the electron loss process [22][23][24][25] yielding an acceptance angle of 4π for ions up to 5 a.u. momentum.…”

“…In the second process, termed ne, the projectile electron is ejected by an interaction with the target nucleus and a second, independent interaction between the projectile nucleus and one of the target electrons facilitates the ejection of the target electron. Depending on the impact energy one of these two processes dominates [13]. The ee process occurs at rather large impact parameters.…”

“…This threshold is due to the fact that the target electron, as seen from the projectile frame, must have sufficient kinetic energy that it can ionize the projectile and simultaneously escape from the target. For He a projectile energy of 0.4 MeV is equivalent to an electron energy of 54 eV, which is the projectile binding energy [13,14]. For the ne process on the contrary the impact parameters are much smaller leading to a larger transverse momentum transfer (perpendicular to the projectile beam direction) and in addition the longitudinal momentum (parallel to the projectile beam direction) is also compensated by the target nucleus [15].…”

Cold Target Recoil Ion Momentum Spectroscopy

“…and below, more than a factor of 10 better than e!usive or static target devices. An even colder gas target has been built using precooling of the target gas to 15 K [66,67]. The ionic momentum resolution in these devices was in most cases not limited by the internal target temperature but by the extension of the target in the ion momentum spectrometer.…”