after VUV + NIR photoabsorption*

Using the COLTRIMS technique, we investigated the dissociation of vibrationally excited H₂ and D₂ molecules after 2-color (VUV + NIR) absorption. The Advanced Light Source synchrotron provided VUV radiation to photoionize H₂ (D₂), leaving H₂⁺ (D₂⁺) ions in specific vibrational states. A synchronized 1030-nm NIR 12 ps laser pulse then dissociated these ions at a controlled time delay. We report on electron emission in the molecular frame, retrieved from the recoil ion lab-frame momentum, and its dependance on the orientation of the VUV and NIR polarizations. For some vibrational states, we observed an asymmetric photoelectron angular distribution that depends on the VUV/IR time delay. This asymmetry could be related to photoelectron retroaction with the dissociating ion.