Odd Rydberg spectrum of20NeI: High resolution laser spectroscopy and multichannel quantum defect theory analysis

Harth, Kirsten; Raab, M.; Hotop, H.

doi:10.1007/bf01384987

Cited by 40 publications

(37 citation statements)

References 48 publications

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“…1, have been described elsewhere [12,14,30,31], therefore emphasis will be put on the level by two single mode dye lasers. Ions formed in thermal energy collisions of the Rydberg atoms with the target molecules are mass selected in a quadrupole mass spectrometer and detected by a Cu-Be-multiplier and fast counting electronics.…”

Section: Methodsmentioning

confidence: 99%

Electron transfer from laser excited rydberg atoms to molecules. Absolute rate constants at low and intermediate principal quantum numbers

Harth

Ruf

Hotop

1989

Z Phys D - Atoms, Molecules and Clusters

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Section: Methodsmentioning

confidence: 99%

Electron transfer from laser excited rydberg atoms to molecules. Absolute rate constants at low and intermediate principal quantum numbers

Harth

Ruf

Hotop

1989

Z Phys D - Atoms, Molecules and Clusters

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“…The energy for this process has been calculated as 60.9 eV for Ne 2 and slightly lower for Ne 3 [5]. For atomic Ne, 62.53 eV were found experimentally [15]. A photon energy of 63 eV therefore is sufficient to yield two photoelectrons, each with a kinetic energy below 2 eV, which might cause the enhancement of the 1.2 eV electron peak.…”

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confidence: 86%

Experimental Evidence for Interatomic Coulombic Decay in Ne Clusters

et al. 2003

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Electron spectra of photoexcited Ne clusters are shown to display a signal at low kinetic energies that is neither present in the Ne monomer nor at photon energies below the inner-valence 2s threshold. These findings are strong evidence for the existence of interatomic Coulombic decays (ICD), a mechanism that was recently predicted theoretically [Phys. Rev. Lett. 79, 4778 (1997)]. In ICD, an inner-valence hole state in a weakly bonded system can undergo ultrafast relaxation due to energy transfer to a neighboring atom, followed by electron emission from this neighboring site. DOI: 10.1103/PhysRevLett.90.203401 PACS numbers: 36.40.Mr, 33.80.Eh, 34.30.+h, 82.33.Fg The nonradiative decay of a core hole vacancy in an excited atom by electron emission is a well known process in spectroscopy, commonly denoted as Auger decay. Traditionally, it is assumed that in extended aggregates -molecules or bulk matter-electrons only at the excited site actively take part in the decay and that the environment of the initially excited atom only modifies the Auger energy spectrum via its influence on the energy levels [1][2][3]. In contrast to that, for weakly bound aggregates, such as van der Waals clusters and hydrogen bonded systems, a radiationless decay mechanism has been predicted, which is possible only by electron emission from neighboring sites of the vacancy [4][5][6]. The final states populated in this so-called ''interatomic Coulombic decay'' (ICD) thus have two positive charges distributed at two different atoms of the system [7]. This lowers their total energy by shielding the Coulomb repulsion of the final state holes. For a lot of systems, it is just this shift in final state energy which makes the decay energetically possible. Where present, ICD should be an ultrafast relaxation pathway, which proceeds on time scales of 1-100 fs. It is therefore expected that it dominates over competing channels, like radiative decay or relaxation involving the nuclear dynamics.Although recently an indirect indication of the relevance of interatomic transitions in the core vacancy decay of molecules has been found [8], an experimental verification of the effect is missing. The major reason for this is probably the low kinetic energy of the electrons emitted by ICD, which is typically a few eV. The unambiguous identification of these electrons would be the only distinct proof for the process. However, the region close to zero kinetic energy in the electron spectrum of a bulk material exposed to vacuum ultraviolet radiation is dominated by inelastically scattered photoelectrons from the valence band. The same is true for clusters, but due to the limited spatial dimensions of the system short range effects like ICD make a relatively higher contribution to the signal close to zero kinetic energy.In this Letter we present direct experimental evidence for ICD in the photoexcited electron spectra of small Ne clusters.In the following, we first introduce the ICD mechanism in some detail. Excited electronic states can decay in two ways, ...

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“…The binding energy of the atomic 2s photoline was set to 48.475 eV [33,34]. The size dependent series of measurements was corrected for the variation of analyzer transmission with electron kinetic energy, which was determined by measuring atomic Xe 4d photolines at a number of energies and normalizing them to some of the N 4,5 OO Auger lines.…”

Section: Methodsmentioning

confidence: 99%