A strong gravitational field resulted in the sedimentation of isotope atoms in monatomic liquid. The concentration ratio ~(82)Se/~(76)Se increased by greater than 3.5% in specimen ultracentrifuged at (0.7-0.9) ×10~6 G and at 300℃. The recovered sample had a feather-shaped crystalline morphology. The concentration gradient was nearly twice that of the steady state analytical result (ideal gas system), indicating a nonideal system diffusion. The present result is evidence of sedimentation of substitutional atoms in condensed matter via self-diffusion and suggestes its possible application to isotope separation, crystalline control, and matter dynamics in massive star.
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