26ème Congrès Général de la SFP

Session

Mini-colloques: MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

5 juil. 2023, 08:30

Centre des Congrès de la Villette (Cité des sciences et de l'Industrie, Paris)

Présidents de session

Mini-colloques: MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse: 1

• Debora Scuderi (Institut de Chimie Physique, CNRS-Université Paris Saclay)

Mini-colloques: MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse: 2

• Debora Scuderi (Institut de Chimie Physique, CNRS-Université Paris Saclay)

212. Photoemission and state-selected fragmentation of “aromatic cyclo-dipeptides” in the gas-phase

Laura CARLINI (Istituto di Struttura della Materia - Consiglio Nazionale delle Ricerche)

05/07/2023 08:30

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Photoemission and state-selected fragmentation of “aromatic cyclo-dipeptides” in the gas-phase

Linear (ℓ-) and cyclo (c-) dipeptides built by linking two aminoacids via one/two peptide bonds, are the simplest peptides present in nature. They are the object of widespread interest since the 50s of the previous century due to their central role in several areas such as development of...

105. Identification of gas phase DNA bases specific isomers via high accuracy single photon ionization and ab initio computations

Majdi Hochlaf (U. Gustave Eiffel)

05/07/2023 09:00

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

DNA/RNA bases and amino acids are building blocks of life. The spectroscopy and stability of their ionic forms are relevant to their survival rate under interstellar conditions, and to the field of radiation damage, where ionizing radiation can lead to DNA/RNA strand breaking and production of hazardous by-products through processes involving nucleobases.
Several experimental works at BESSY...

31. XUV and X-ray spectroscopy of phthalocyanines in the gas-phase

Gildas GOLDSZTEJN (UMR8214)

05/07/2023 09:30

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Phthalocyanine are synthetic molecules closely related to the natural porphyrines. Thanks to their rich photophysics and photochemistry, they show promising potential in a wealth of applications, including biology or medicine. We are particularly interested in transition-metal containing molecules and, more precisely, to the interaction between 3d orbitals of the metal and its surrounding N 2p...

219. Toward Elucidating Solvation Effects in Photoelectron Circular Dichroism

Dominik Stemer (Fritz Haber Institute - Max Planck Society)

05/07/2023 09:50

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Photoelectron circular dichroism (PECD) — the forward-backward asymmetry in photoemission from chiral molecules photoionized by circularly polarized light — is an exquisitely sensitive experimental probe, capable of determining enantiomeric excess and electronic and molecular structures in chiral samples. Although the use of PECD to study chiral biomolecules under physiologically relevant...

413. Condensation Effects on Electron Chiral Asymmetries in the Photoionization of Serine

Gustavo GARCIA-MACIAS (Synchrotron SOLEIL)

05/07/2023 10:10

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Structural changes at the molecular level, occurring at the onset of condensation, can be probed by angle-resolved valence photoelectron spectroscopy, which is inherently sensitive to the electronic structure. For larger condensed systems like aerosol particles, the observation of intrinsic angular anisotropies in photoemission (β parameters) is challenging due to the strong reduction of their...

412. Molecular structure identification in mass spectrometry by Free-Electron Laser-based IR ion spectroscopy

Jos Oomens (Radboud University)

05/07/2023 14:00

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Mass spectrometry (MS) is one of the primary analytical methods in the characterization of complex mixtures, samples that contain thousands of molecular constituents in concentrations that vary by many orders of magnitude. Both sensitivity and resolving power of MS are unparalleled by other analytical methods. However, determination of molecular structures on the basis of MS data is...

300. Activation and spectroscopy of mass and charge selected ions

Alexandre GIULIANI (Synchrotron SOLEIL)

05/07/2023 14:30

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Gas phase spectroscopy provides unique advantages by allowing access to intrinsic properties of matter in the absence of solvents, making it an excellent means to test theoretical methods. However, this approach requires placing the sample in the gas phase, which can be challenging for large or fragile species such as biomolecules. Modern ionization techniques, such as electrospray ionization...

249. Mapping the electronic transitions of protonation sites in peptides using soft X-ray radiation

Juliette Leroux

05/07/2023 15:00

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

Proton transfer is a fundamental charge transfer process in Chemistry, and it is particularly important for biological molecules, since they usually contain basic groups. Therefore, in order to study charge dynamics in isolated biomolecules, it is crucial to determine the initial location of protons. Although it is now well established that protonation occurs primarily at nitrogen atoms of the...

274. New opportunities for THz-XUV pump-probe experiments after upgrading the FEL at Hamburg (FLASH)

Ekaterina Zapolnova (DESY)

05/07/2023 15:20

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

FLASH at DESY in Hamburg has a unique FEL scheme, which includes XUV and THz undulators, providing soft X-Ray and intense tunable THz pulses at a high repetition rate simultaneously with low jitter [1]. The combination of XUV and THz pulses at FLASH enables time-resolved pump-probe experiments to study structural and electron dynamics of molecules[2,3], coherent control of magnetization...

225. Host-guest complexes between beta-cyclodextrins and small drugs for SERS detection in drinking water

Nicolas Nieuwjaer (Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, CNRS)

05/07/2023 15:40

MC14 Sources de photons sur accélérateurs pour l'étude des biomolécules en phase gazeuse

Contribution orale

beta-CycloDextrin (b-CD) is a macrocyclic oligosaccharide composed of seven D-glucopyranoside units linked in alpha-(1,4) bonds. b-CD has a truncated cone tri-dimensional structure. Its central cavity is hydrophobic, allowing low-polarity molecules to be encapsulated partially or entirely by host-guest interaction, meanwhile the external part is hydrophilic because of the presence of 21...