Laser Phase Control of High-Order Harmonic Generation at Large Internuclear Distance: The H{sup +}-H{sub 2}{sup +} System

Journal Article · Fri Jan 05 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.013001· OSTI ID:20861578

Bandrauk, Andre D; Barmaki, Samira; Kamta, Gerard Lagmago ^[1]

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1. Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R2 (Canada)

Exact (Born-Oppenheimer) 3-D numerical solutions of the time-dependent Schroedinger equation are obtained for the one electron linear H{sup +}-H{sub 2}{sup +} atom-molecule system at large internuclear distance R in interaction with two-cycles intense (I>10{sup 14} W cm{sup -2}) 800 nm laser pulses. High-order harmonic generation (HHG) spectra are obtained with an energy cutoff larger than the atomic maximum of I{sub p}+3U{sub p}, where I{sub p} is the ionization potential and U{sub p} is the ponderomotive energy. At large R, this extended cutoff is shown to be related to the nature of electron transfer, whose direction is shown to depend critically on the carrier-envelope phase (CEP) of the ultrashort pulse. Constructive and destructive interferences in the HHG spectrum resulting from coherent superpositions of electronic states in the H{sup +}-H{sub 2}{sup +} system are interpreted in terms of multiple electron trajectories extracted from a time profile analysis.

• OSTI ID: 20861578
• Journal Information: Physical Review Letters, Vol. 98, Issue 1; Other Information: DOI: 10.1103/PhysRevLett.98.013001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BORN-OPPENHEIMER APPROXIMATION
ELECTRON TRANSFER
ELECTRONS
HARMONIC GENERATION
HYDROGEN IONS 1 PLUS
HYDROGEN IONS 2 PLUS
INTERFERENCE
IONIZATION POTENTIAL
NUMERICAL SOLUTION
PONDEROMOTIVE FORCE
SCHROEDINGER EQUATION
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
TRAJECTORIES