Abstract
Since spring 2019 an experimental setup consisting of an electron spectrometer and an ion time-of-flight mass spectrometer for diluted samples has been available for users at the FinEstBeAMS beamline of the MAX IV Laboratory inLund, Sweden. The setup enables users to study the interaction of atoms, molecules, (molecular) microclusters and nanoparticles with short-wavelength (vacuum ultraviolet and X-ray) synchrotron radiation and to follow the electron and nuclear dynamics induced by this interaction. Test measurements of N2 and thiophene (C4H4S) molecules have demonstrated that the setup can be used formany-particle coincidence spectroscopy. The measurements of the Ar 3p photoelectron spectra by linear horizontal and vertical polarization show that angle-resolved experiments can also be performed. The possibility to compare the electron spectroscopic results of diluted samples with solid targets in the case of Co2O3 and Fe2O3 at the Co and Fe L2,3-absorption edges in the same experimental session is also demonstrated. Because the photon energy range of the FinEstBeAMS beamline extends from 4.4 eV up to 1000 eV, electron, ion and coincidence spectroscopy studies can be executed in a very broad photon energy range.
Highlights
IntroductionThe recent emergence of new light sources such as low-emittance storage rings, soft and hard X-ray free-electron lasers has stimulated studies of the electronic structure and dynamics of atoms, molecules, clusters and liquids, by photoelectron spectroscopy, ion spectroscopy and X-ray spectroscopy techniques (Piancastelli et al, 2010; Berrah et al, 2010)
The recent emergence of new light sources such as low-emittance storage rings, soft and hard X-ray free-electron lasers has stimulated studies of the electronic structure and dynamics of atoms, molecules, clusters and liquids, by photoelectron spectroscopy, ion spectroscopy and X-ray spectroscopy techniques (Piancastelli et al, 2010; Berrah et al, 2010).Molecular photofragmentation is one of the important branches of studies concerning molecular reaction dynamics
We have presented the gas-phase endstation with multicoincidence setup at the FinEstBeAMS beamline in the MAX IV 1.5 GeV storage ring
Summary
The recent emergence of new light sources such as low-emittance storage rings, soft and hard X-ray free-electron lasers has stimulated studies of the electronic structure and dynamics of atoms, molecules, clusters and liquids, by photoelectron spectroscopy, ion spectroscopy and X-ray spectroscopy techniques (Piancastelli et al, 2010; Berrah et al, 2010). The simplest example of photodissociation processes is a twobody reaction of diatomic molecules, in which a parent ion breaks into just two pieces In this case the kinematic and energetic information about one single fragment is sufficient to acquire almost complete knowledge of the dynamics of the whole photodissociation event. The data from the TOF spectrometer allows us to retrieve the final state momentum of the ion in all three spatial dimensions This coincidence spectroscopy technique was first mentioned in 1987 (Eland, 1987) and nowadays photoelectron–photoion–photoion coincidence (PEPIPICO) spectroscopy and Auger electron–photoion– photoion coincidence (AEPIPICO) are important spectroscopic methods, especially since the introduction of multi-hit position-sensitive delay-line detectors (Jagutzki et al, 2002a,b). The selected examples of measurements are not given as novel scientific results, but to illustrate the capabilities of the present setup
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