Publications by authors named "Evangelia Sakkoula"

In molecular beam scattering experiments, an important technique for measuring product energy and angular distributions is velocity map imaging following photoionization of one or more scattered species. For studies with cold molecular beams, the ultimate resolution of such a study is often limited by the product detection process. When state-selective ionization detection is used, excess energy from the ionization step can transfer to kinetic energy in the target molecular ion-electron pair, resulting in measurable cation recoil.

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Article Synopsis
  • - The study explores the photodissociation of CO molecules at 157 nm, focusing on the O(D) + CO(Σ) product channel using velocity map imaging to capture detailed fragment behavior.
  • - Utilizing resonance enhanced multiphoton ionization (REMPI), both O(D) and CO(Σ) products were analyzed for their energy and angular distributions, revealing how these distributions vary with the vibrational state of CO.
  • - Results indicate that changes in the angular distribution of CO fragments correlate with the rotational quantum number, supporting theoretical models of CO dissociating into a bent excited state that impacts the dissociation process.
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Short-chain fatty acids (SCFAs) are important metabolites produced by the gut microbiome as a result of the fermentation of non-digestible polysaccharides. The most abundant SCFAs are acetic acid, propionic acid, and butyric acid which make up 95% of this group of metabolites in the gut. Whilst conventional analysis SCFAs is done using either blood or fecal samples, SCFAs can also be detected in exhaled breath using proton transfer reaction-time-of-flight- mass spectrometry (PTR-ToF-MS) using HO for ionization.

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In this work, the CO Vacuum Ultraviolet (VUV) photodissociation dynamics of the dominant O(D) channel near 155 nm have been studied using Velocity Map Imaging (VMI) technique. Correlations among the transition dipole moment of the parent molecule, recoil velocity vector and rotational angular momentum vector of the photofragments were extracted from the anisotropic angular distributions of the images. The vector correlations extracted indicated a picture of photodissociation mainly the excited 2A' (A) state.

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