High-order harmonic generation from two-center molecules: Time-profile analysis of nuclear contributions

Journal Article · Thu Jul 01 00:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.011404· OSTI ID:20643855

Kamta, G Lagmago; Bandrauk, A D ^[1]

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1. Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, Quebec J1K 2R1 (Canada)

We solve the exact three-dimensional time-dependent Schroedinger equation for H{sub 2}{sup +} (with fixed nuclei) interacting with an intense laser pulse with an arbitrary oriented linear polarization. We find that at equilibrium internuclear distance, the ionization probability of H{sub 2}{sup +} is maximum for the parallel orientation of the molecule with respect to the laser polarization, and is minimum for the perpendicular orientation. The contribution of each nucleus to the harmonic spectrum is evaluated, so that interference effects between the two contributions are assessed unambiguously. We show that every half-cycle, high order harmonics are emitted by each nucleus when the electron wave packet returns for a recollision with both nuclei, and that the resulting harmonic emission is predominant for the nucleus that experiences the first recollision. In general, each nucleus emits both even and odd harmonics, but even harmonics are destroyed by interferences between contributions from each nucleus. In general, this destructive interference occurs over a large spread of harmonic orders, which depends on the angle between the molecular axis and the laser polarization.

• OSTI ID: 20643855
• Journal Information: Physical Review. A, Vol. 70, Issue 1; Other Information: DOI: 10.1103/PhysRevA.70.011404; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BOND LENGTHS
ELECTRONS
HARMONIC GENERATION
HYDROGEN IONS 2 PLUS
INTERFERENCE
LASER RADIATION
MOLECULES
ORIENTATION
PHOTOIONIZATION
PHOTON-MOLECULE COLLISIONS
POLARIZATION
PROBABILITY
PULSES
SCHROEDINGER EQUATION
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
VISIBLE RADIATION
WAVE PACKETS