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We describe two-photon photoassociation (PA) experiments operated in anultracold gas of metastable $^4$He$^*$ atoms in the $2^3S_1$ state.Atom-molecule dark resonances as well as Raman signals provide information onthe exotic molecule in the least bound vibrational J=2, $v=14$ state of the$^5\Sigma_g^+$ interaction potential of two spin-polarized metastable atoms.The physical origin of the various two-photon PA signals is first discussed.Their linewidths are interpreted in term of processes limiting the lifetime$\tau$ of the exotic molecule. A value of $\tau=1.4\pm0.3 \mu$s is found, whichis discussed in view of two recent calculations of the Penning ionization rateinduced by spin-dipole coupling and of the atom-molecule inelastic collisions

Lifetime of weakly bound dimers of ultracold metastable helium studied by photoassociation