Grundlagen zur Erzeugung flaechiger Plasmen bei Atmosphaerendruck mit neuartigen, steuerbaren Elektrodensystemen. Teilvorhaben: Physikalische Grundlagen einer auf Mikrostruktur-Elektroden (MSE) basierenden Flaechen-Plasmaquelle Schlussbericht

SIGLEAvailable from TIB Hannover: F02B1625 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman

IKF - Jahresbericht 1982

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Dynamik der Einfach- und Doppelionisation von Helium in schnellen Protonenstoessen

SIGLEAvailable from TIB Hannover: RA 3692(91-28) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Cold-target recoil-ion momentum-spectroscopy: First results and future perspectives of a novel high resolution technique for the investigation of collision induced many-particle reactions

In order to investigate many-particle reaction dynamics in atomic collisions a novel high-resolution technique has been developed, which determines the momentum and the charge state of the slowly recoiling target ions. Using a very cold, thin, and localized supersonic gas jet target a momentum resolution of better than 0.05 a.u. is obtained by measuring the recoil-ion time-of-flight and the recoil-ion trajectory. Because of the very high detection efficiency of nearly 100% this technique is well suited for many-particle coincidence measurements in ionizing collisions. First experimental results for fast ion and electron impact on helium targets are presented. Future applications in atomic collision physics and related areas are discussed. (orig.)SIGLEAvailable from TIB Hannover: RO 801(94-63) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Recoil-ion momentum spectroscopy

High-resolution recoil-ion momentum spectroscopy (RIMS) is a novel technique to determine the charge state and the complete final momentum vector P_R of a recoiling target ion emerging from an ionising collision of an atom with any kind of radiation. It offers a unique combination of superior momentum resolution in all three spatial directions of #DELTA#P_R = 0.07 a.u. with a large detection solid angle of #DELTA##OMEGA#_R/4#pi##>=# 98%. Recently, low-energy electron analysers based on rigorously new concepts and reaching similar specifications were successfully integrated into RIM spectrometers yielding so-called ''reaction microscopes''. Exploiting these techniques, a large variety of atomic reactions for ion, electron, photon and antiproton impact have been explored in unprecedented detail and completeness. Among them first kinematically complete experiments on electron capture, single and double ionisation in ion-atom collisions at projectile energies between 5 keV and 1.4 GeV. Double photoionisation of He has been investigated at energies E_#gamma# close to the threshold (E_#gamma# = 80 eV) up to E_#gamma# = 58 keV. At E_#gamma#>8 keV the contributions to double ionisation after photoabsorption and Compton scattering were kinematically separated for the first time. These and many other results will be reviewed in this article. In addition, the experimental technique is described in some detail and emphasis is given to envisage the rich future potential of the method in various fields of atomic collision physics with atoms, molecules and clusters. (orig.)220 refs.Available from TIB Hannover: RO 801(96-46) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Intra-atomic double scattering of binary encounter electrons in collisions of fast heavy-ions with atoms and molecules

We present first experimental evidence for intra-atomic double scattering of Binary Encounter electrons produced in collisions of 5.9 MeV/u U"2"9"+ with neon, xenon and molecular gases. A broad distribution of electrons is observed at a velocity twice the velocity of the moving ion (v_P) at angles #theta#_e up to 135 . We attribute the emission pattern to well known target Binary Encounter electrons around 2v_P at extreme forward laboratory angles, that are subsequently elastically scattered in the target nuclear potential to the large angles observed. (orig.)Available from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Complete single ionization momentum spectra for strong perturbation collisions

The combination of recoil ion and ionized electron momentum spectroscopy provides an unparalleled method to investigate the details of ion-atom collision dynamics in kinematically complete experiments. To predict singleionization scattering behavior at the level now realized by experiment, the classical trajectory three-body Monte Carlo method has been used to obtain complete momenta information for the ionized electron, recoil ion, and projectile in the collision plane defined by the incident projectile and outgoing recoil ion. Strongly coupled systems were considered where the charge state of the projectile divided by the speed of the collision q/v is greater than unity. Illustrated are 3.6 MeV/u Se"2"8"+ and 9.5 MeV/u Ni"2"6"+ collisions on He where experimental data are available. The theoretical results are in good agreement with these data and calculations have been performed for 165 keV/u and 506 keV/u C"6"++He to compare results for the same q/v perturbation strengths. (orig.)Available from TIB Hannover: RO 801(97-47) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

The dynamics of target single and double ionization induced by the virtual photon field of fast heavy ions

The collision dynamics of helium single and double ionization after impact of 3.6 MeV/u Se"2"8"+ projectiles has been explored using the high resolution electron - recoil-ion momentum spectrometer at GSI. The complete three particle final state in momentum space was determined with a resolution of #DELTA#p#approx##+-#0.1 a.u. in the case of single ionization by measuring the three momentum components of both, the emitted electron and the recoiling target-ion in coincidence. For double ionization the longitudinal momenta of both individual electrons were determined in coincidence with the recoil-ion. The electrons final momenta reflect the correlated motion in the ground state of helium (neon) during a time interval (collision time) which is short compared to the average revolution frequency. The ionization of the target atom shows correspondence to photodisintegration by the equivalent photon field of the passing fast highly charged projectile. (orig.)23 refs.Available from TIB Hannover: RO 801(96-48) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Zur Spektroskopie des 1ssigma-Orbitals in superschweren Stosssystemen Messungen der Emissionswahrscheinlichkeiten fuer die quasi-molekulare K-Strahlung am Stosssystem Pb + Pb bei kleinen internuklearen Abstaenden

SIGLEDEGerman

Cold target recoil ion momentum spectroscopy

The experimental technique of Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) is described. It allows a three dimensional imaging of momentum space of the recoiling ion for all ionizing atomic reaction with 4#pi# solid angle for momentum measurement. The resolution presently achieved is #+-#0.035 a.u. Depending on the collision system this corresponds to a resolution in projectile energy loss of down to #DELTA#E/E=10"-"9 and a scattering angle resolution of down to 10"-"9 rad for fast heavy ion collisions. We discuss the experimental technique and some recent results on dynamics of recoil ion production for electron capture, target ionization and projectile electron loss. (orig.)24 refs.Available from TIB Hannover: RO 801(95-80) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman