Search results for "laser photodetachment"

showing 2 items of 2 documents

Preparation of negative ion beams for the determination of the electron affinity of polonium by laser photodetachment

2021

A letter of intent submitted to the ISOLDE and Neutron-Time-of-flight Committee (INTC) at CERN to prepare the negative ion beam as a step towards measuring the electron affinity of polonium at CRIS (ISOLDE).

CRISelectron affinityPhysics::Accelerator Physicsnegative ionlaser photodetachment spectroscopyDetectors and Experimental TechniquesNuclear ExperimentpoloniumISOLDE
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Production of hydrogen negative ions in an ECR volume source: balance between vibrational excitation and ionization

2018

International audience; The operation of an ECR-driven (2.45 GHz) hydrogen negative ion source is studied. Electron densities and temperatures are investigated with electrostatic probes and negative ion densities are measured with laser photodetachment. Vacuum ultraviolet irradiance measurements are focused on molecular transitions to the ground state while high-resolution visible emission spectroscopy is used to study the transitions between excited states for both molecules and atoms. The standalone operation of the source is found to be more efficient in higher pressures (12 mTorr) where negative ion densities are as high as 4×109 cm−3. Further investigation on the operation of the sou…

Materials scienceECR sourcesHydrogenchemistry.chemical_elementElectronplasmafysiikka7. Clean energy01 natural sciences010305 fluids & plasmasIonPhysics::Plasma PhysicsIonization0103 physical sciencesMoleculeEmission spectrumVDFs010302 applied physics[PHYS]Physics [physics]EEDFsH- ionsCondensed Matter PhysicsVUV irradiancechemistryExcited statehigh-resolution visible emission spectroscopyAtomic physicsGround statelaser photodetachment
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