Fragmentation of H$_{2}^{+}$ molecules irradiated by intense 395 nm femtosecond laser pulses: a coincidence 3D momentum imaging study.

As the most fundamental molecule, H$_{2}^{+}$ is the natural choice of study to understand fast molecular response to intense ($>$ 10$^{12}$ W cm$^{-2})$ short pulse ($<$ 100 fs) laser fields. Previously this molecular ion, prepared as a fast ($\sim $10 keV) target, has been explored by our group using a 790 nm Ti:Sapphire laser revealing, for example, interesting structure in the ionization channel attributed to above-threshold Coulomb explosion. Using the second harmonic of this frequency (395 nm light) provides better energy resolution of photon-order dependent processes. As such we present here a coincidence 3D momentum imaging study of H$_{2}^{+}$ at this wavelength and compare the results to those using 790 nm light centering the discussion on both the ionization and dissociation channels. A theoretical interpretation of the results is offered.