  An obvious determination of the acceleration of gravity g can be deduced from
the measurement of the velocity of falling atoms using a pi-pi pulses sequence
of stimulated Raman transitions. By using a vertical standing wave to hold
atoms against gravity, we expect to improve the relative accuracy by increasing
the upholding time in the gravity field and to minimize the systematic errors
induced by inhomogeneous fields, owing to the very small spatial amplitude of
the atomic center-of-mass wavepacket periodic motion. We also propose to use
such an experimental setup nearby a Watt balance. By exploiting the g/h (h is
the Planck constant) dependence of the Bloch frequency, this should provide a
way to link a macroscopic mass to an atomic mass.
