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Title: Mechanisms of ultrahigh-order harmonic generation

Abstract

We analyze mechanisms of high-order harmonic generation from two-center molecules at large internuclear separations in linearly polarized laser fields. Since laser-driven electrons acquire instantaneous kinetic energies of up to 8 times the ponderomotive potential U{sub p}, recombination at an appropriately placed nucleus leads to ultrahigh-order harmonic emission [P. Moreno, L. Plaja, and L. Roso, Phys. Rev. A 55, R1593 (1997)]. By solving the time-dependent Schroedinger equation for model systems, we show that this mechanism is only efficient if the single-particle orbital of the electron is coherently delocalized over the two potential wells. This is realized in the ground state of a one-electron molecular ion. In a neutral molecule or in a molecular ion created by ionization of a neutral molecule at large internuclear distance, the coherence is destroyed by electron-electron correlation.

Authors:
 [1]
  1. Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, D-69117 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
20786595
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 72; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.72.053816; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DISTANCE; ELECTRON CORRELATION; ELECTRONS; EMISSION; GROUND STATES; HARMONIC GENERATION; KINETIC ENERGY; LASER RADIATION; MOLECULAR IONS; MOLECULES; PHOTOIONIZATION; PHOTON-MOLECULE COLLISIONS; PONDEROMOTIVE FORCE; POTENTIALS; RECOMBINATION; SCHROEDINGER EQUATION; TIME DEPENDENCE

Citation Formats

Lein, Manfred. Mechanisms of ultrahigh-order harmonic generation. United States: N. p., 2005. Web. doi:10.1103/PHYSREVA.72.0.
Lein, Manfred. Mechanisms of ultrahigh-order harmonic generation. United States. doi:10.1103/PHYSREVA.72.0.
Lein, Manfred. Tue . "Mechanisms of ultrahigh-order harmonic generation". United States. doi:10.1103/PHYSREVA.72.0.
@article{osti_20786595,
title = {Mechanisms of ultrahigh-order harmonic generation},
author = {Lein, Manfred},
abstractNote = {We analyze mechanisms of high-order harmonic generation from two-center molecules at large internuclear separations in linearly polarized laser fields. Since laser-driven electrons acquire instantaneous kinetic energies of up to 8 times the ponderomotive potential U{sub p}, recombination at an appropriately placed nucleus leads to ultrahigh-order harmonic emission [P. Moreno, L. Plaja, and L. Roso, Phys. Rev. A 55, R1593 (1997)]. By solving the time-dependent Schroedinger equation for model systems, we show that this mechanism is only efficient if the single-particle orbital of the electron is coherently delocalized over the two potential wells. This is realized in the ground state of a one-electron molecular ion. In a neutral molecule or in a molecular ion created by ionization of a neutral molecule at large internuclear distance, the coherence is destroyed by electron-electron correlation.},
doi = {10.1103/PHYSREVA.72.0},
journal = {Physical Review. A},
number = 5,
volume = 72,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2005},
month = {Tue Nov 15 00:00:00 EST 2005}
}