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A new phase of a gas of pairs of electrons bounded in a singlet state is found in the one-dimensional t -J model for J )2t and the density of electrons less than 0.2. This phase was conjectured in the study of the diagonalization of small lattices [Phys. Rev. Lett. 66, 2388 (1991)]. The existence of this new phase for much larger lattice sizes is demonstrated by a combination of two numerical methods, the variational Monte Carlo and the power method. A trial wave function for this phase isdoi:10.1103/physrevb.47.11548 pmid:10005307 fatcat:2gwbqabjmvcnznwxd5sckls76m