The electron-capture and excitation processes in slow collisions of protons
with He*(1s3l) are studied using the close-coupling method within the semi
classical approximation. The Stark splitting of electron-capture states on
H is explicitly taken into account and the coupling-matrix elements between
these states and the initial angular-momentum states on He are calculated
analytically. The cross sections for excitation (de-excitation) and single-
electron capture to specific spherical hydrogen states have been calculated
in the relative velocity range 2 x 10(6)-1.3 x 10(8) cm s(-1). The cross s
ection values for both types of processes in the considered velocity range
are found to be large (10(-14)-10(-13) cm(2)) due to the large values of el
ectron-exchange couplings at large internuclear distances. The excitation (
de-excitation) processes are controlled by two-step exchange (capture and r
e-capture) transitions rather than by direct coupling among the states cent
red on He.