Two-photon excitation of low-lying electronic quadrupole states in atomic clusters
- Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region 141980 (Russian Federation)
- Institute of Theoretical Physics II, University of Erlangen-Nurnberg, D-91058, Erlangen (Germany)
- Department of Physics, Technical University Kaiserslautern, D-67653 (Germany)
- Institute of Electronics, Bulgarian Academy of Sciences, Sofia (Bulgaria)
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 time-dependent local density approximation calculations. As a test case, the deformed cluster Na{sub 11}{sup +} 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=2x10{sup 10}-2x10{sup 11} W/cm{sup 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 us to gather full mean-field spectra of valence electrons near the Fermi energy. Besides, the scheme allows us to estimate the lifetime of electron-hole pairs and hence the relaxation time of electronic energy into ionic heat.
- OSTI ID:
- 20974499
- Journal Information:
- Physical Review. A, Vol. 73, Issue 2; Other Information: DOI: 10.1103/PhysRevA.73.021201; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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