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We calculate the energy level shift of a static ground state two-level atom interacting with fluctuating massless scalar fields in the Hartle-Hawking vacuum outside a Schwarzschild black hole.It is found that the energy level shift is position-dependent and gives rise to a force on the atom besides the classical gravitational force. This force behaves like r- 1(r - 2M)-1 for r approaching 2M,whereas it behaves like r-2 for large r.