2015
DOI: 10.1088/0953-4075/48/23/234004
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Auger electron and photoabsorption spectra of glycine in the vicinity of the oxygen K-edge measured with an X-FEL

Abstract: Abstract. We report the first measurement of the near oxygen K-edge Auger spectrum of the glycine molecule. Our work employed an X-ray free electron laser as the photon source operated with input photon energies tunable between 527 and 547 eV. Complete electron spectra were recorded at each photon energy in the tuning range, revealing resonant and non-resonant Auger structures. Finally ab initio theoretical predictions are compared whit the measured above the edge Auger spectrum and an assignment of Auger deca… Show more

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Cited by 10 publications
(14 citation statements)
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“…The IAM is based on the fact that for sufficiently high electron kinetic energies, elastic and inelastic electron scattering cross‐sections can be approximated using the single‐atom cross‐sections of the molecular constituents. The Auger electron spectrum for gas‐phase glycine has been measured very recently and is dominated by a broad, structured band between 225 and 260 eV that is centered at about 250 eV and we assume this to be a good approximation for carbon 1s Auger electrons from a protein as well. For electron energies exceeding 200 eV, deviations of IAM inelastic scattering cross‐sections from experimental data for molecules such as CO 2 are typically smaller than 10 % .…”
Section: Figurementioning
confidence: 99%
“…The IAM is based on the fact that for sufficiently high electron kinetic energies, elastic and inelastic electron scattering cross‐sections can be approximated using the single‐atom cross‐sections of the molecular constituents. The Auger electron spectrum for gas‐phase glycine has been measured very recently and is dominated by a broad, structured band between 225 and 260 eV that is centered at about 250 eV and we assume this to be a good approximation for carbon 1s Auger electrons from a protein as well. For electron energies exceeding 200 eV, deviations of IAM inelastic scattering cross‐sections from experimental data for molecules such as CO 2 are typically smaller than 10 % .…”
Section: Figurementioning
confidence: 99%
“…Depending on the final electronic state of the inner-shell excitation process and even more so, on the molecular orbitals involved in the subsequent Auger de-excitation, the electronic excitation of the melittin cations can cover a range of 50 eV or more, with an average of almost 20 eV [18,34].…”
Section: Small Neutral Lossesmentioning
confidence: 99%
“…However, as all proteins under study are composed from a wide range of amino acids, it is assumed that differences in the soft X-ray absorption induced excitation energy distributions average out. Sanchez-Gonzalez et al 22 have measured the kinetic energy distribution of Auger electrons emitted after C 1s ionization of gas phase glycine, the simplest amino acid, using 560 eV photons (Fig. 11).…”
Section: Electronic Excitation and Internal Temperaturementioning
confidence: 99%
“…Assuming a complete conversion of electronic excitation into vibrational excitation by IVR, the absolute internal temperature T depends on the excitation energy E exc as follows 23 T ¼ E exc cðT; nÞsk where s is the number of oscillators or degrees of freedom, k is the Boltzman constant, and c(T,n) a function that varies from 0 11 Auger-electron spectrum for core ionization of gas-phase glycine molecules using hn = 560 eV photons. 22 The top axis gives the excitation energy, as determined from the cutoff energy (here estimated as 269 eV). The inset sketches Auger electron emission involving the two most loosely bound electrons.…”
Section: Electronic Excitation and Internal Temperaturementioning
confidence: 99%