We have developed a new kind of recoil ion momentum spectroscopy technique, using a precooled supersonic gas jet target, to determine state selective, scattering angle dependent cross sections for swift ion-atom collisions ( 0. 25 , ..., , 1 MeV He2+ on He), by measuring the transverse and longitudinal momentum of the recoil ion. A longitudinal momentum resolution of ± 0.13 a. u. was achieved, about a factor of 30 better than ever obtained before, which enables a clear separation of K and L shell capture. In the transverse direction a resolution corresponding to a projectile scattering angle uncertainty of Δ ϑ P = ±1 μ rad was obtained.
V. Mergel and R. Dorner and J. H. Ullrich and O. Jagutzki and S. Lencinas and S. Nuttgens and L. Spielberger and M. Unverzagt and C. L. Cocke and R. E. Olson and M. Schulz and U. Buck and E. Zanger and W. Theisinger and M. Isser and S. Geis and H. Schmidt-Bocking, "State Selective Scattering Angle Dependent Capture Cross Sections Measured by Cold Target Recoil Ion Momentum Spectroscopy," Physical Review Letters, vol. 74, no. 12, pp. 2200-2203, American Physical Society (APS), Mar 1995.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.74.2200
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