Comment on “A proposed method for measuring the electric dipole moment of the neutron using acceleration in an electric field gradient and ultracold neutron interferometry”

We discuss the proposal of Freedman, Ringo and Dombeck (Nucl. Instr. and Meth. A 396 (1997) 181) to search for the neutron electric dipole moment using the acceleration of ultracold neutrons in an inhomogeneous electric field followed by amplification of the resulting displacement by several methods involving spin independent interactions (gravity) or reflection from curved (spin independent) mirrors. We show that the proposed technique is inferior to the usual methods based on magnetic resonance.