A gas target with built-in slit geometry for scattering experiments with charged particles - Morsch, H.P.; Becker, T.; Fitz, W. (Elsevier)
A gas cell has been built with radial shielding strips and slits at fixed angles. The 1sinθ dependence of the effective target volume is compensated by different slit widths.
http://linkinghub.elsevier.com/retrieve/pii/0029-554X(69)90685-5
Keywords: ZP; U