Corrections to the first-order semiclassical description of the electr
omagnetic breakup of B-8 in heavy-ion collisions are studied. Second-
and third-order corrections to the Coulomb dissociation of light proje
ctiles in heavy-ion collisions are calculated in an approximation for
small adiabaticity parameters, Quantum mechanical diffraction effects
are investigated in a simple approximation obtained from Glauber theor
y. The methods are applied to the B-8 breakup at projectile energies o
f 46.5 and 250 A . MeV, Implications on the extraction of the astrophy
sical S-factor of the inverse Be-7(p,gamma)B-8 reaction, which is rele
vant to the solar neutrino problem, are discussed.