[en] Emerging charge state distributions of 44 MeV/amu ¹²⁹Xe⁴⁴⁺ and 29 MeV/amu ²⁰⁸Pb⁵⁶⁺ transmitted through various solid targets have been measured and analyzed using the GANIL facility. (orig.)

[en] During the last five years, a powerful technique emerged which led to a new insight of Ion-Atom collision dynamics: the Recoil Ion Momentum Spectroscopy (RIMS). Its high momentum resolution makes it act as a dynamical microscope. Its 4π detection solid angle allows additional coincident analysis such as electron spectroscopy. The way towards a multifragment 4π detector for atomic collisions is open. CIRIL is one of the pioneer laboratories in which this technique has been developed and is now used to investigate the whole collision energy range available at GANIL through several collaborations (CIRIL/LSA, GSI/CIRIL, CIRIL/LSA/LCAM). The latest achievements of the RIMS in the field of Ion-Atom or Molecule collisions are presented. (author)

[en] Noting the lack of and the increasing need for information concerning heavy ion stripping in the intermediate velocity regime, the authors have studied a large number of ion-target systems experimentally. They present experimental charge state distributions obtained at the GANIL accelerator for several projectiles (36 ≤ Z_p ≤ 92) with energies ranging from 18 MeV/u to 44 MeV/u, emerging from various target foils (4 ≤ Z_t ≤ 79) of natural isotopic composition. The target thicknesses (from 1 microg/cm² up to several mg/cm²) are chosen to cover the pre- and post-charge-state equilibrium regimes. Charge state fractions, mean charge state, charge distribution width, and emerging ion energy are tabulated for each of the 107 projectile-target element-target thickness combinations. They also present an improvement of the semi-empirical formulae proposed by Baron et al. to predict the mean charge states and the distribution widths at equilibrium. These formulae are compared with the available experimental data

[en] Diode-pumped crystals provided recently new compact laser devices. We report the first end pumping of a La_xNd_1-xMgAl₁₁O₁₉(LNA) crystal using a 200mW diode array (Spectra Diode Lab). We also report the first results obtained with a 1mW diode (SONY). This C.W. laser can be tuned from 1.048μm to 1.086μm. Without selective elements in the cavity, the laser emits around 1.054μm with a threshold of 24mW and a slope efficiency of 4.4% (output mirror of transmission T = 1%) when pumped by the diode array. With the selective elements, the threshold increases to 100mW and we obtain a power of 4mW for a pump power of 200mW

[en] We present a detailed study of the two collisional systems: He²⁺ (11 keV/u) and O⁷⁺ (4 keV/u) on CO molecule. We measured in coincidence the full momentum vector of the two fragments of the dissociated molecule and the projectile charge state. It is thus straightforward to access the dependence of the capture process on the angle between the beam and the internuclear axis of the molecule. The KER (kinetic energy release) distribution for each fragmentation channel is obtained for each outgoing projectile charge state associated to single capture, stabilized and autoionizing double capture,.. It has to be noted that, contrarily to ion-atom collisions, Auger decay of the target plays an important role: double capture by He²⁺ on CO may lead to four-fold ionization of the target. (orig.)

[en] ⁴He (2 ³S₁) metastable atoms are optically pumped with intensity modulated light. The use of a single mode diode-pumped LNA laser as the pumping source, allows the study of resonance signals predicted by the optical pumping theory but not yet observed. Resonances are detected on the transmitted pumping beam at the modulation frequency and its harmonics. Application of this method to high sensitivity magnetometers is suggested

[en] Radiative emission, in the 300-600 nm wavelength range of Ar II recoil ions produced by the impact of a 6.8 MeV amu^-1 Xe⁴²⁺ pulsed ion beam on an argon target has been studied using a time resolved fluorescence technique. Excited states in Ar II are found to be due to the primary impact but also to secondary charge exchange collisions. Radiative lifetimes and secondary relaxation times are determined from fluorescence decays. (author)

[en] The O and C 1s photoelectron satellites for the CO₂ molecule fixed in space parallel to the electric vector of the incident radiation E are found to be more intense, in general, than those perpendicular to E and are enhanced at the photon energy in the vicinity of the shape resonance for the single-hole ionization cross section. This suggests that the excitation of the valence electron may be caused by the internal inelastic scattering of a primary 1s photoelectron with a valence electron

[en] Cross sections for electron emission in the energy range from 2--300 eV were measured for 60 MeV/u Kr³⁴⁺ ions impacting on H₂ . Model calculations are introduced to guide the search for interference effects in the electron spectra produced by the coherent emission of electrons from the two H atoms in analogy with Young's two-slit experiment. Experimentally, a full sinusoidal-like oscillation was observed in the energy range up to 250 eV in good agreement with the calculations. The oscillatory structure is found to be similar for the observation angles 20^o , 30^o , 150^o , and 160^o

[en] We demonstrate the use of a multiparticle coincidence technique to image the diffraction of an electron wave whose source is placed at a specific site in a free molecule. Core-level photoelectrons are used to illuminate the molecule from within. By measuring the vector momenta of two molecular fragments and the photoelectron, a richly structured electron diffraction pattern is obtained in a body-fixed frame of the randomly oriented molecule in the gas phase. We illustrate this technique for CO, creating a photoelectron from the C(1s) shell and scanning its energy from zero to 30eV