  The collective emission from a one-dimensional chain of interacting two-level
atoms is investigated. We calculate the light scattered by dissipative
few-excitation eigenstates in the far-field, and in particular focus on
signatures of a lattice two-body bound state. We present analytical results for
the angle-resolved, temporal decay of the scattered light intensity. Moreover,
we find that the steady-state emission spectrum that emerges when the system is
probed by a weak, incoherent driving field exhibits a distinct signature for
the existence of a bound state, and allows to determine the momentum
distribution of the two-body relative wavefunction. Intriguingly, our study
does not rely on single-atom addressability and/or manipulation techniques.
