  Pure electronic Raman spectra with no phonon structures superimposed to the
electronic continuum, are reported, in optimally doped
HgBa_{2}CaCu_{2}O_{6+\delta } single crystals (T_{c }=126 K). As a consequence,
the spectra in the A_{1g }, B_{1g } and B_{2g } symmetries, including the
crucial low energy frequency dependence of the electronic scattering, are
directly and reliably measured. The B_{2g } and, most strikingly, the B_{1g }
spectra exhibit a strong intrinsic linear term, which suggests that the nodes
are shifted from the [110] and [1\bar{1}0] directions, a result inconsistent
with a pure d_{x^{2}-y^{2}} model.
