Theoretical exploration of pump and probe in medium-sized Na clusters

Andrae, K.; Reinhard, P.‐G.; Suraud, E.

doi:10.1088/0953-4075/35/20/307

Cited by 17 publications

(18 citation statements)

References 29 publications

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“…The x and y modes are nearly degenerate due to near axial symmetry of the total system. Pump and probe analysis of the time-dependent plasmon peaks thus provides worthwhile information about the shapes of the embedded cluster, which can be measured by probe pulse as explained in [12,59,14,15]. Note here that the experimental results obtained for Ag clusters in glass [23] are in qualitative agreement with our findings.…”

Section: Possible Pathways To Experimental Analysissupporting

confidence: 89%

“…Indeed, the plasmon couples strongly to light at very specific frequencies and these plasmon frequencies are uniquely related to the cluster shape. For free clusters, we have discussed a rather simple pump-and-probe setup which allows to map in a unique fashion the evolution of radial shape [12], of quadrupole deformations [59] and of elongation in a fission process [14,15]. We have computed that for the case considered here.…”

Section: Possible Pathways To Experimental Analysismentioning

confidence: 99%

“…It provides a strong coupling to photons in a very narrow frequency window which makes clusters an ideal laboratory for laser induced non-linear dynamics [9,10]. The plasmon also serves as a versatile handle for pump and probe experiments [11,12,13,14,15], and it provides the key mechanism in driving the hefty Coulomb explosion of clusters [16,17]. For a recent summary on this great variety of phenomena of the dynamics of free metal clusters, see [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Embedded metal cluster in strong laser fields

Fehrer

Dinh

Reinhard

et al. 2008

Computational Materials Science

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We discuss microscopic mechanisms of the violent dynamics following strong laser excitation of a metal cluster embedded in a rare gas matrix, taking as test case Na8@Ar434. This covers at least two aspects: first, it represents the typical experimental situation of metal clusters handled in raregas matrices or a finite drop of surrounding raregas material, and second, it serves as a generic test case for highly excited chromophores in inert surroundings addressing questions of energy transport and perturbation of the medium. We simulate the process up to 10 ps using a mixed quantum mechanical (for the electrons) and classical (ions and atoms) approach and analyze the emerging dynamics with respect to all basic constituents: cluster electrons, cluster ions, and matrix atoms. We find several stages of relaxation taking place with time scales from a few fs to over a few ps and much slower processes remaining for long after the simulation. A particularly interesting aspect is that the surrounding raregas material stabilizes a highly charged metal cluster which would otherwise explode without delay.

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Section: Possible Pathways To Experimental Analysissupporting

confidence: 89%

Section: Possible Pathways To Experimental Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Embedded metal cluster in strong laser fields

Fehrer

Dinh

Reinhard

et al. 2008

Computational Materials Science

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“…Nonetheless, one can read the result positively: all approaches agree in predicting a long initial period of quasi-stability which is well in the range of experimental observation, e.g. by pump-and-probe techniques assessing the time evolution of cluster shape through the time evolution of the Mie plasmon resonance [31,32,33].…”

Section: Stability In Principlementioning

confidence: 64%

Hindered Coulomb explosion of embedded Na clusters — stopping, shape dynamics and energy transport

et al. 2007

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Abstract. We investigate the dynamical evolution of a Na8 cluster embedded in Ar matrices of various sizes from N = 30 to 1048. The system is excited by an intense short laser pulse leading to high ionization stages. We analyze the subsequent highly non-linear motion of cluster and Ar environment in terms of trajectories, shapes, and energy flow. The most prominent effects are : temporary stabilization of high charge states for several ps, sudden stopping of the Coulomb explosion of the embedded Na8 clusters associated with an extremely fast energy transfer to the Ar matrix, fast distribution of energy throughout the Ar layers by a sound wave. Other ionic-atomic transfer and relaxation processes proceed at slower scale of few ps. The electron cloud is almost thermally decoupled from ions and thermalizes far beyond the ps scale.

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“…The latter ones even provide a time-resolved access to dynamics, at ionic pace with femtosecond (fs) [21,22] down to electronic pace with attosecond (as) pulses [23,24,25,26,27]. The PES of course remains a highly valuable tool of investigation of the dynamics, as it basically provides insight into electronic dynamics via ionization characteristics.…”

Section: Introductionmentioning

confidence: 99%

On the analysis of photo-electron spectra

et al. 2015

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We analyze Photo-Electron Spectra (PES) for a variety of excitation mechanisms from a simple mono-frequency laser pulse to involved combination of pulses as used, e.g., in attosecond experiments. In the case of simple pulses, the peaks in PES reflect the occupied single-particle levels in combination with the given laser frequency. This usual, simple rule may badly fail in the case of excitation pulses with mixed frequencies and if resonant modes of the system are significantly excited. We thus develop an extension of the usual rule to cover all possible excitation scenarios, including mixed frequencies in the attosecond regime. We find that the spectral distributions of dipole, monopole and quadrupole power for the given excitation taken together and properly shifted by the single-particle energies provide a pertinent picture of the PES in all situations. This leads to the derivation of a generalized relation allowing to understand photo-electron yields even in complex experimental setups.

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Theoretical exploration of pump and probe in medium-sized Na clusters

Cited by 17 publications

References 29 publications

Embedded metal cluster in strong laser fields

Embedded metal cluster in strong laser fields

Hindered Coulomb explosion of embedded Na clusters — stopping, shape dynamics and energy transport

On the analysis of photo-electron spectra

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