dorsal/arxiv
View SchemaTwo-Photon Excitation of Low-Lying Electronic Quadrupole States in Atomic Clusters
| Authors | V. O. Nesterenko, P. -G. Reinhard, T. Halfmann, L. I. Pavlov |
|---|---|
| Categories | |
| ArXiv ID | physics/0511069 |
| URL | https://arxiv.org/abs/physics/0511069 |
| DOI | 10.1103/PhysRevA.73.021201 |
| Journal | Phys. Rev. A73, n.2, 021201(1-4) (2006) |
Abstract
A simple scheme of population and detection of low-lying electronic quadrupole modes in free small deformed metal clusters is proposed. The scheme is analyzed in terms of the TDLDA (time-dependent local density approximation) calculations. As test case, the deformed cluster $Na^+_{11}$ is considered. Long-living quadrupole oscillations are generated via resonant two-photon (two-dipole) excitation and then detected through the appearance of satellites in the photoelectron spectra generated by a probe pulse. Femtosecond pump and probe pulses with intensities $I = 2\cdot 10^{10} - 2\cdot 10^{11} W/cm^2$ and pulse duration $T = 200 - 500$ fs are found to be optimal. The modes of interest are dominated by a single electron-hole pair and so their energies, being combined with the photoelectron data for hole states, allow to gather new information about mean-field spectra of valence electrons in the HOMO-LUMO region. Besides, the scheme allows to estimate the lifetime of electron-hole pairs and hence the relaxation time of electronic energy into ionic heat.
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"abstract": "A simple scheme of population and detection of low-lying electronic\nquadrupole modes in free small deformed metal clusters is proposed. The scheme\nis analyzed in terms of the TDLDA (time-dependent local density approximation)\ncalculations. As test case, the deformed cluster $Na^+_{11}$ is considered.\nLong-living quadrupole oscillations are generated via resonant two-photon\n(two-dipole) excitation and then detected through the appearance of satellites\nin the photoelectron spectra generated by a probe pulse. Femtosecond pump and\nprobe pulses with intensities $I = 2\\cdot 10^{10} - 2\\cdot 10^{11} W/cm^2$ and\npulse duration $T = 200 - 500$ fs are found to be optimal. The modes of\ninterest are dominated by a single electron-hole pair and so their energies,\nbeing combined with the photoelectron data for hole states, allow to gather new\ninformation about mean-field spectra of valence electrons in the HOMO-LUMO\nregion. Besides, the scheme allows to estimate the lifetime of electron-hole\npairs and hence the relaxation time of electronic energy into ionic heat.",
"arxiv_id": "physics/0511069",
"authors": [
"V. O. Nesterenko",
"P. -G. Reinhard",
"T. Halfmann",
"L. I. Pavlov"
],
"categories": [
"physics.atm-clus",
"physics.optics"
],
"doi": "10.1103/PhysRevA.73.021201",
"journal_ref": "Phys. Rev. A73, n.2, 021201(1-4) (2006)",
"title": "Two-Photon Excitation of Low-Lying Electronic Quadrupole States in Atomic Clusters",
"url": "https://arxiv.org/abs/physics/0511069"
},
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