The Gas Phase Photoemission (GAPH) beamline is the only one at Elettra specifically devoted to research on gaseous systems.
GAPH offers a multi-technique approach for investigation of electronic properties of free atoms, molecules and clusters in the photon energy range 13-900 eV.

The broad energy range, the high resolving power and flux together with the purpose built end-stations, make this facility ideal for investigating the spectroscopy and dynamics of basic processes like inner-shell and multiple excitations and ionisation, as well as for characterising key processes relevant to several areas of science and technology (for example atmospheric chemistry, material science and biomedical sciences).

Gas Phase highlights | Publications

Vibrationally resolved high-resolution NEXAFS and XPS spectra of phenanthrene and coronene

 C1s Near-Edge X-rayAbsorption Fine-Structure (NEXAFS) spectroscopy and X-ray Photoelectron Spectroscopy in the gas phase of two polycyclic aromatic hydrocarbons (phenanthrene and coronene) have been measured and compared to vibrationally resolved theoretical spectra. G. Fronzoni et al JCP 141 (2014).

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Production of excited H at C1s edge of the methane molecule studied by VUV-photon-photion and metastable-fragment-photion coincidence experiments

Core ionization of a molecule just above the 1s ionization potential leads to recapture processes where the photoelectron is pushed back to a high Rydberg orbital of the molecular ion. Upon dissociation highly excited neutral fragments can be produced together with ions. 
Kivimaki A et al.  Phys. Rev. A 88 (2014) 043412

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"Position” does matter: The photofragmentation of the nitroimidazole isomers

Experimental and theoretical spectroscopic methods have been combined to disentangle the fundamental mechanism of VUV induced fragmentation of the three isomers of nitroimidazole. P. Bolognesi et al.  J. Chem. Phys., (2016)
 

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Enhanced Ionization of Embedded Clusters by Electron-Transfer-Mediated Decay in Helium Nanodroplets

 We report the observation of electron-transfer-mediated decay (ETMD) involving magnesium (Mg) clusters embedded in helium (He) nanodroplets.. A. C. LaForge et al.; PRL 116, 203001 (2016)

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Negative-Ion/Positive-Ion Coincidence Yields of Core-Excited Water

The analysis of negative-ion/positive-ion (NIPICO) and negative-ion/positive-ion/positive-ion coincidence (NIPIPICO) events provides new information on pathways leading to negative ion production in water.
C. Stråhlman et al.; J. Phys. Chem. (2016)

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Elucidating the 3d Electronic Configuration in Manganese Phthalocyanine

To shed light on the metal 3d electronic structure of manganese phthalocyanine we performed photoelectron measurements both in the gas phase and as thin film.  J.Bramboiu et al. JPCA 2014.

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Proposal Sumission

We invite users and collaborators to discuss their proposals with the beamline local contacts well in advance before the submission deadline. This is crucial for a careful assesment of the experiment feasibility and may lead to improvements in the proposed experimental plan. Our website provides a wealth of informaiton on experiment feasibilty and proposal submission. For more info, please vist the user info section.

Call for proposals