  We report the observation of cyclotron resonance (CR) in a metal possessing
pure quasi-one-dimensional Fermiology - namely, the organic linear-chain
compound (TMTSF)2ClO4, whose Fermi surface consists of a pair of weakly warped
sheets. The CR phenomenon is related to weak inter-chain coupling, which allows
electrons constrained on open trajectories to acquire small transverse
velocities. Application of an appropriately oriented magnetic field induces
periodic motion transverse to the chain direction and, hence, to a resonance in
the AC conductivity. The field orientation dependence of the resonance is
related simply to the Fermi velocity and lattice periodicity.
