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- ItemImaging molecular structure through femtosecond photoelectron diffraction on aligned and oriented gas-phase molecules(Cambridge [u.a.] : Royal Society of Chemistry, 2014) Boll, R.; Rouzée, A.; Adolph, M.; Anielski, D.; Aquila, A.; Bari, S.; Bomme, C.; Bostedt, C.; Bozek, J.D.; Chapman, H.N.; Christensen, L.; Coffee, R.; Coppola, N.; De, S.; Decleva, P.; Epp, S.W.; Erk, B.; Filsinger, F.; Foucar, L.; Gorkhover, T.; Gumprecht, L.; Hömke, A.; Holmegaard, L.; Johnsson, P.; Kienitz, J.S.; Kierspel, T.; Krasniqi, F.; Kühnel, K.-U.; Maurer, J.; Messerschmidt, M.; Moshammer, R.; Müller, N.L.M.; Rudek, B.; Savelyev, E.; Schlichting, I.; Schmidt, C.; Scholz, F.; Schorb, S.; Schulz, J.; Seltmann, J.; Stener, M.; Stern, S.; Techert, S.; Thøgersen, J.; Trippel, S.; Viefhaus, J.; Vrakking, M.; Stapelfeldt, H.; Küpper, J.; Ullrich, J.; Rudenko, A.; Rolles, D.This paper gives an account of our progress towards performing femtosecond time-resolved photoelectron diffraction on gas-phase molecules in a pump-probe setup combining optical lasers and an X-ray free-electron laser. We present results of two experiments aimed at measuring photoelectron angular distributions of laser-aligned 1-ethynyl-4-fluorobenzene (C8H5F) and dissociating, laser-aligned 1,4-dibromobenzene (C6H4Br2) molecules and discuss them in the larger context of photoelectron diffraction on gas-phase molecules. We also show how the strong nanosecond laser pulse used for adiabatically laser-aligning the molecules influences the measured electron and ion spectra and angular distributions, and discuss how this may affect the outcome of future time-resolved photoelectron diffraction experiments.