THEORY OF ELECTRON CAPTURE TO THE CONTINUUM
FOR NON-0$^\circ$ PROJECTILE SCATTERING

J. Fiol$^\dag$, V. D. Rodr\'{\i}guez$^\ddag$ and R. O. Barrachina$^\dag$

$^\dag$Centro At\'omico Bariloche and Instituto Balseiro,
8400 S. C. de Bariloche, R\'{\i}o Negro, Argentina \\
$^\ddag$Departamento de F\'{\i}sica, Universidad de Buenos Aires, FCEyN,
1428 Buenos Aires, Argentina

We present a full quantum-mechanical calculation of the electron capture to
the continuum (ECC)  cusp  at  non-0$^\circ$ electron emission angles.  The
target ionization cross section triply differential in the energy and angle
of the emitted electron and  the  angle  of  the  scattered  projectile  is
evaluated and compared with recent experimental  data  by  Sarkadi  {\it et
al.} for 75 keV protons scattered by  Ar  at  3.7$^\circ$,  5.0$^\circ$ and
8.1$^\circ$.  The present theory accounts reasonably well  for the shape of
the observed ECC peak.