Time-of-flight study of differential scattering in Li⁺-Na and Na⁺-Li collisions

Polarisation effects in electron transfer reactions with laser excited Na(3P) at medium energies

“…The differential cross sections for Li (2s) and Li (2p) production (reactions IV (a) and (b)) are plotted in Fig. 3c in reasonable agreement with the DCS measured by Okamoto et al [15]. The measured ratio of total cross sections for the dominant charge transfer reactions IV (a) and IV (c) in Li+-Na(3s) and Li + -Na (3 p) collisions respectively o-(o)/a(a ) : 0.6 + 0.1 is in good agreement with the very recent calculations for this system performed by Lewartovski et al [16] who find a value of a(c)/a(a ) = 0.66•…”

Fraunhofer Diffraction of Atomic Matter Waves: Electron Transfer Studies with a Laser Cooled Target

“…When a 6 Li 1 ion with a kinetic energy of a few keV hits a sodium atom in the Na͑3s͒ ground state with an impact parameter b less than about 10a 0 , the probability for transfer of the 3s valence electron into the Li͑2s͒ state is very high, as detailed in several experimental and theoretical studies [5][6][7][8][9][10]. As a result of this S-S transfer, a coherent Li͑2s͒ atom wave will emerge from a "hole" of radius r 10a 0 .…”

“…The diffraction rings have a characteristic angular spacing of about Du l dB ͞2r p͞kr 0.008 ± for 6 keV 6 Li 1 ions (y 0.2 a.u.). However, corresponding experimental studies using conventional scattering geometries [5][6][7] have been performed with angular resolutions of 0.01 ± (FWHM), or worse. As demonstrated below, our novel combination of laser cooling and 3D COLTRIMS spectroscopy enables us to achieve an angular resolution which is about an order of magnitude higher, and we clearly resolve a rich structure in the DCS which allows us to perform a detailed comparison of theory and experiment.…”

Superconducting YBa2Cu3O7-δ Particles Prepared from Freeze-Dried Nitrates

“…Melius and Goddard (1974) explained the Li(2p) population by the rotational coupling between the Na(3s ) and Li(2p ) molecular states in the vicinity of the crossing of their potential curves at R c = 5.1 au, but they did not calculate the DCS. The DCS was later measured by Wijnaends et al (1978) and Okamoto et al (1981). The electron transfer to Li(2p) gives rise to slightly larger scattering angles than for Li(2s).…”

“…The Li(2s ) potential curve has a deep well inside this avoided crossing and the molecular basis study of Machholm et al (1994, henceforth referred to as paper I) found that this well causes sharp oscillations in the calculated DCS for electron transfer to Li(2s) at 1 keV. The scattering angles are very small θ ≈ 0.05 • , therefore these oscillations are not resolved experimentally (Okamoto et al 1981). Nevertheless, the experimental and theoretical results compare well when the latter are convoluted with the experimental resolution.…”