Cryan, James P.Glownia, J. M.Andreasson, J.Belkacem, A.Berrah, N.Blaga, C. I.Bostedt, C.Bozek, J.Buth, C.DiMauro, L. F.Fang, L.Gessner, O.Guehr, M.Hajdu, J.Hertlein, M. P.Hoener, M.Kornilov, O.Marangos, J. P.March, A. M.McFarland, B. K.Merdji, H.Petrović, V. S.Raman, C.Ray, D.Reis, D.Tarantelli, F.Trigo, M.White, J. L.White, W.Young, L.Bucksbaum, P. H.Coffee, R. N.2023-12-072023-12-072010-08-20https://hdl.handle.net/2097/43810The Linac Coherent Light Source free electron laser is a source of high brightness x rays, 2×1011 photons in a ∼5 fs pulse, that can be focused to produce double core vacancies through rapid sequential ionization. This enables double core vacancy Auger electron spectroscopy, an entirely new way to study femtosecond chemical dynamics with Auger electrons that probe the local valence structure of molecules near a specific atomic core. Using 1.1 keV photons for sequential x-ray ionization of impulsively aligned molecular nitrogen, we observed a rich single-site double core vacancy Auger electron spectrum near 413 eV, in good agreement with ab initio calculations, and we measured the corresponding Auger electron angle dependence in the molecular frame.© American Physical Society (APS). This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).Text