Search results for "photoelectrons"

showing 2 items of 2 documents

Radiation controlled energy of photoelectrons produced by two-color short pulses.

2008

We report on numerical results of energy spectra of photoelectrons emitted by irradiating a hydrogen atom with the superposition of two pulses. The spectra have been obtained by numerical integration of the time dependent Schr¨odinger equation. The highest frequency component of the pulse has been assumed to have low intensity and such a frequency that a single photon may ionize the atom. Its duration has been assumed to lie in the range of subfemtoseconds. The lowest frequency component that redistribute the energy of the ionized electrons has an higher intensity and duration of few femtoseconds. We find that when the field are aligned, the electron energy spectra strongly depend on the ti…

PhysicsRange (particle radiation)PhotonField (physics)General Physics and AstronomyElectronRadiationPhotoelectric effectPulse (physics)energy spectra photoelectrons Schr¨odinger equationIonizationGeneral Materials SciencePhysical and Theoretical ChemistryAtomic physics
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Photoelectron emission experiments with ECR-driven multi-dipolar negative ion plasma source

2017

Photoelectron emission measurements have been performed using a 2.45 GHz ECR-driven multi-dipolar plasma source in a low pressure hydrogen discharge. Photoelectron currents induced by light emitted from ECR zone and H− production region are measured from Al, Cu, Mo, Ta, and stainless steel (SAE 304) surfaces as a function of microwave power and neutral hydrogen pressure. The total photoelectron current from the plasma chamber wall is estimated to reach values up to 1 A for 900 W of injected microwave power. It is concluded that the volumetric photon emission rate in wavelength range relevant for photoelectron emission is a few times higher in arc discharge. peerReviewed

plasma sourcesta114HydrogenWavelength rangeChemistryPhysics::Instrumentation and DetectorssyklotronitMicrowave powerAnalytical chemistrychemistry.chemical_elementPlasmaplasmatekniikkaelektronitIonElectric arcECR ion sourcesDipolePhysics::Plasma PhysicsPhysics::Atomic and Molecular ClustersphotoelectronsCurrent (fluid)Atomic physicsemissio (fysiikka)
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