Abstract
A metastable orthorhombic form of ${\mathrm{KC}}_{60}$ is identified from synchrotron x-ray powder-diffraction measurements. Structure analysis reveals ${\mathrm{C}}_{60}$ dimers with a 9.34 \AA{} center-to-center separation. This structure competes with equilibrium phase separation (\ensuremath{\alpha}-${\mathrm{C}}_{60}$ plus ${\mathrm{K}}_{3}$${\mathrm{C}}_{60}$) and with polymer formation; it is obtained by quenching from above 420 K to 298 K and immediately cooling below 270 K. If the polymer is indeed a one-dimensional metal, the dimer structure should be a Peierls insulator.
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