Cl K$\beta$ and Cl K$\alpha$ resonant x-ray Raman

K$\beta$ and K$\alpha$ x-ray emission has been measured after core Cl 1{\it s} resonant excitation of gas phase HCl. Dispersive asymmetrical K$\alpha$ emission lines were observed. This new effect is described in terms of resonant x-ray Raman scattering. In the case of the K$\beta$, we observed a dynamical emission explained, thanks to theoretical calculations, by the nuclear dynamics on a sub-femtoseconde time scale. Work was partly supported by NSF grant PHY-01-40375.