0000000000243204

AUTHOR

Klaas Bergmann

showing 4 related works from this author

Roadmap on STIRAP applications

2019

STIRAP (stimulated Raman adiabatic passage) is a powerful laser-based method, usually involving two photons, for efficient and selective transfer of populations between quantum states. A particularly interesting feature is the fact that the coupling between the initial and the final quantum states is via an intermediate state, even though the lifetime of the latter can be much shorter than the interaction time with the laser radiation. Nevertheless, spontaneous emission from the intermediate state is prevented by quantum interference. Maintaining the coherence between the initial and final state throughout the transfer process is crucial. STIRAP was initially developed with applications in …

PhotonAtomic Physics (physics.atom-ph)Digital storageStimulated Raman adiabatic passage02 engineering and technologyStimulated Raman adiabatic passage (STIRAP)01 natural scienceslaw.inventionPhysics - Atomic PhysicsFTIR SPECTROSCOPYstimulated Raman adiabatic passage (STIRAP)lawStereochemistryRare earthsStatistical physicsMetal ionsmolecular Rydberg statesQCparity violationPhysicseducation.field_of_studyQuantum PhysicsElectric dipole momentsCoherent population transfer021001 nanoscience & nanotechnologyCondensed Matter Physicsacoustic waves; molecular Rydberg states; nuclear coherent population transfer; parity violation; spin waves; stimulated Raman adiabatic passage (STIRAP); ultracold moleculesADIABATIC PASSAGEAtomic and Molecular Physics and OpticsChemical DynamicsMolecular beamsVIOLATING ENERGY DIFFERENCEResearch group A. Pálffy – Division C. H. KeitelStimulated emission0210 nano-technologyCoherence (physics)Experimental parametersPopulationFOS: Physical sciencesacoustic waves530spin wavesMolecular Rydberg statesELECTROMAGNETICALLY INDUCED TRANSPARENCYSINGLE PHOTONSQuantum statePhysics - Chemical Physics0103 physical sciencesUltracold moleculesSpontaneous emissionddc:530Nuclear coherent population transfer010306 general physicseducationStimulated Raman adiabatic passageChemical Physics (physics.chem-ph)Rare-earth-ion doped crystalsPhotonsQuantum opticsnuclear coherent population transferBROAD-BANDControlled manipulationsPOLAR-MOLECULESMoleculesRydberg statesLaserSuperconducting quantum circuitAcoustic wavesParity violationstimulated Raman adiabatic passage (STIRAP); ultracold molecules; parity violation; spin waves; acoustic waves; molecular Rydberg states; nuclear coherent population transferDewey Decimal Classification::500 | Naturwissenschaften::530 | Physikultracold moleculesQuantum Physics (quant-ph)QUANTUM GASSpin waves
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Dissociative charge transfer from highly excited Na Rydberg atoms to vibrationally excited Na2 molecules

2001

Abstract We report the observation of the vibrational dependence of dissociative charge transfer (DCT), Na2(X1Σg+, v″) + Na∗∗(nl) → Na− + Na + Na+, in a single Na/Na2 supersonic beam at low intrabeam collision energies (1.6 meV) using the STIRAP technique for selective vibrational excitation of Na2 in the electronic ground state and time-of-flight mass analysis of the ions. The efficiency of this process increases by about an order of magnitude in the range 13 ≤ v″ ≤ 22. Some perspectives are discussed regarding the implementation of a field-free ion-imaging technique for the detection of ions that will allow the direct determination of the kinetic energy distributions of product negative i…

ChemistryPhotodissociationCondensed Matter PhysicsKinetic energyIonExcited stateRydberg atomMoleculePhysical and Theoretical ChemistryAtomic physicsGround stateInstrumentationSpectroscopyExcitationInternational Journal of Mass Spectrometry
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Vibrational effects in Na2( , v′)+Na(3p3/2) associative ionization

1999

Abstract Associative ionizing Na2( A 1 Σ + u , v′)+Na(3p3/2) collisions have been studied in a single supersonic beam with respect to the influence of the initial vibrational excitation of the molecules on the reaction efficiency. An enhancement of trimer ion yield of nearly one order of magnitude has been observed as the vibrational excitation increases from v′=0 to v′=14.

ChemistryIonizationGeneral Physics and AstronomyMoleculeSupersonic speedTrimerPhysical and Theoretical ChemistryAtomic physicsOrder of magnitudeBeam (structure)ExcitationIonizing radiationChemical Physics Letters
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Nonlinear Hanle effect in Cs vapor under strong laser excitation

2002

We report results of a theoretical and experimental study of the ground state nonlinear Hanle effect under strong laser excitation. It is shown that besides the well-known zero-magnetic field suppression of absorption on F g = F→F e = F - 1 transitions caused by population trapping, an optical pumping induced enhanced absorption occurs on F g = F→F e = F + 1 transitions for small B-fields. The latter effect becomes more pronounced for high F values. The experiment with atomic vapor of Cs (D2 line, F g = 4) confirms an increase of the spectrally unresolved fluorescence yield at zero magnetic field and 600 mW/cm2 laser intensity by 9% or 42%, when excitation occurs with linearly or circularly…

Hanle effectPhysicseducation.field_of_studyPopulationOptical physicsOptical polarizationLaserAtomic and Molecular Physics and Opticslaw.inventionOptical pumpinglawAtomic physicseducationGround stateExcitationThe European Physical Journal D - Atomic, Molecular and Optical Physics
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