The extremely neutron-rich nucleus C-19 has been studied by Coulomb dissoci
ation into C-18 + n at 67 A MeV. A large E1 strength of 0.71 +/- 0.07 e(2)
fm(2) has been observed at low excitation energies. An analysis of the angu
lar distribution of C-18 + n Center Of mass has led to a determination of t
he neutron separation energy of C-19 to be 530 +/- 130 keV. The El strength
distribution can be well reproduced for a C-19 ground state structure with
a dominant s-wave valence neutron, providing a consistent picture of the n
eutron halo structure of C-19.