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NEXAFS spectroscopy and site-specific fragmentation of N-methylformamide, N,N-dimethylformamide, and N,N-dimethylacetamide

Journal article
Authors P. Salen
Vasyl Yatsyna
L. Schio
Raimund Feifel
R. Richter
M. Alagia
S. Stranges
Vitali Zhaunerchyk
Published in Journal of Chemical Physics
Volume 144
Issue 24
Pages artikel nr 244310
ISSN 0021-9606
Publication year 2016
Published at Department of Physics (GU)
Pages artikel nr 244310
Language en
Links dx.doi.org/10.1063/1.4954704
https://gup.ub.gu.se/file/206829
Keywords x-ray-absorption, fine-structure spectroscopy, inner-shell excitation, transform mass-spectrometry, pmma thin-film, amino-acids, coincidence, spectroscopy, selective dissociation, core excitation, ion desorption, Chemistry, Physics
Subject categories Physical Sciences, Chemical Sciences

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. Published by AIP Publishing.

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