title: Investigation of the amino acids glycine, proline, and methionine by photoemission spectroscopy.
abstract: The valence and core level photoelectron spectra of glycine, proline, and methionine in the gas phase have been investigated by VUV and soft X-ray radiation. The outer valence band photoemission spectra are similar to previously reported He I spectra, although relative peak intensities are different due to the different photon energy. We extended the spectral range to include the inner valence region. The carbon, nitrogen, and oxygen 1s as well as the sulfur 2p core level spectra of these amino acids have been measured and the states identified. Valence band spectra of proline have been recorded as a function of temperature, and they provide information about the relative populations of the lowest energy conformers.
authors.affiliation: Sincrotrone Trieste, Area Science Park, I-34012 Basovizza (Trieste), Italy. Oksana.Kudelich@elettra.trieste.it
authors.forename: Oksana
authors.initials: O
authors.lastname: Plekan
authors.forename: Vitaliy
authors.initials: V
authors.lastname: Feyer
authors.forename: Robert
authors.initials: R
authors.lastname: Richter
authors.forename: Marcello
authors.initials: M
authors.lastname: Coreno
authors.forename: Monica de
authors.initials: Md
authors.lastname: Simone
authors.forename: Kevin C
authors.initials: KC
authors.lastname: Prince
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Carravetta
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D005740:Gases / Q000737:chemistry; D008715:Methionine / Q000737:chemistry*; D008956:Models, Chemical; D017785:Photons; D011392:Proline / Q000737:chemistry*; D013053:Spectrophotometry; D013696:Temperature; D014466:Ultraviolet Rays; D014965:X-Rays
chemical_list: D000596:Amino Acids; D005740:Gases; D011392:Proline; D008715:Methionine