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Simulations show that CO 2 adsorbed in the groove sites of carbon nanotubes displays unique quasi-onedimensional behavior. Clusters containing only odd numbers of molecules are formed at finite CO 2 coverages and low temperatures. The molecules are orientationally ordered with respect to the nanotube groove axis and azimuthally ordered in the plane perpendicular to the groove axis. This ordering is a result of a delicate balance between solid-fluid and fluid-fluid forces; the CO 2 quadrupoledoi:10.1103/physrevlett.94.125701 pmid:15903938 fatcat:gcypdsk34bcc3ml3kdwol66fia