期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 9, 页码 1962-1965出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.1962
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We present the first measurement of the polarizability and the permanent dipole moment of isolated KC60 molecules by molecular beam deflection technique. We have obtained a value of 2506 +/- 250 Angstrom(3) for the polarizability at room temperature. The addition of a potassium atom enhances by more than a factor of 20 the polarizability of a pure C-60 molecule. This very high polarizability and the lack of observed permanent dipole show that the apparent polarizability of KC60 is induced by the foe skating of the potassium atom on the C-60 surface, resulting in a statistical orientation of the dipole. The results are interpreted with a simple model similar to the Langevin theory for paramagnetic systems.
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