Intense laser-controlled quenching of molecular fragmentation

Journal Article · Thu Feb 15 04:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.023404· OSTI ID:20982142

Lefebvre, C ^[1]; Nguyen-Dang, T T ^[2]; Atabek, O ^[3]

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1. Departement de Chimie, Universite Laval, Quebec, Quebec G1K 7P4 (Canada)
2. Departement de Chimie, Universite Laval, Quebec, Quebec, Canada G1K 7P4 (Canada)
3. Laboratoire de Photophysique Moleculaire du CNRS, Batiment 210, Campus d'Orsay 91405, Orsay, Cedex (France)

We show how efficient control can be exerted on molecular dissociation by adiabatic shaping of an intense, single laser pulse in a very simplified way, involving a few parameters (e.g., peak amplitude, carrier-wave, and modulation phases and frequencies). The strategy takes advantage of an appropriate combination of basic multiphoton mechanisms: bond softening (BS), vibrational trapping (VT), and dynamical dissociation quenching (DDQ). The resulting stabilization enhancement with respect to dissociation may increase up to a factor of 5, while simultaneously inhibiting the BS mechanism and reenforcing the VT mechanism, using DDQ. The photodissociation of H{sub 2}{sup +} submitted to a uv-visible field modulated by an IR periodic envelope, on which the consequences of a DDQ-type mechanism has recently experimentally been checked, is taken as an illustrative example.

• OSTI ID: 20982142
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
CARRIERS
DISSOCIATION
FRAGMENTATION
HYDROGEN IONS 2 PLUS
LASER RADIATION
MODULATION
MULTI-PHOTON PROCESSES
PERIODICITY
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
PULSES
QUENCHING
STABILIZATION
TRAPPING
VIBRATIONAL STATES