title: NEXAFS spectroscopy and site-specific fragmentation of N-methylformamide, N,N-dimethylformamide, and N,N-dimethylacetamide.
abstract: Near-edge X-ray absorption fine-structure (NEXAFS) spectra measured at the C, N, and O K-edges for three molecules containing the amide moiety, N-methylformamide (HCONHCH3), N,N-dimethylformamide (HCON(CH3)2), and N,N-dimethylacetamide (CH3CON(CH3)2) are presented. These molecules have similar structures and differ by the number of methyl groups located at the molecular ends. The fragmentation of these molecules after resonant excitation at different K-edge resonances is also investigated, using a 3D-ion imaging time-of-flight spectrometer. A comparison between the molecules with respect to the relative contributions of the fragments created upon excitation at distinct resonances reveals site-specific fragmentation. Further information about the character of the core-excitation and dissociation process is obtained from the angular distributions of the ion fragments.
authors.affiliation: Department of Physics, Stockholm University, 106 91 Stockholm, Sweden.
authors.forename: Peter
authors.initials: P
authors.lastname: Salén
authors.affiliation: Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden.
authors.forename: Vasyl
authors.initials: V
authors.lastname: Yatsyna
authors.affiliation: IOM-CNR Tasc, SS-14, Km 163.5 Area Science Park, Basovizza, I-34149 Trieste, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Schio
authors.affiliation: Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden.
authors.forename: Raimund
authors.initials: R
authors.lastname: Feifel
authors.affiliation: Elettra - Sincrotrone Trieste, Area Science Park, 34149 Basovizza, Trieste, Italy.
authors.forename: Robert
authors.initials: R
authors.lastname: Richter
authors.affiliation: IOM-CNR Tasc, SS-14, Km 163.5 Area Science Park, Basovizza, I-34149 Trieste, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: Alagia
authors.affiliation: IOM-CNR Tasc, SS-14, Km 163.5 Area Science Park, Basovizza, I-34149 Trieste, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Stranges
authors.affiliation: Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden.
authors.forename: Vitali
authors.initials: V
authors.lastname: Zhaunerchyk