Multiphoton and above-threshold detachment computed for a model negative ion and compared with perturbation theory

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Journal of the Optical Society of America, Part B: Optical Physics; (USA)

DOI:https://doi.org/10.1364/JOSAB.7.000407· OSTI ID:6851163

Roso-Franco, L ^[1]; Eberly, J H ^[2]

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1. Departament de Fisica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain (ES)
2. Max-Planck-Institut fuer Quantenoptik, D-8046 Garching, Federal Republic of Germany (DE)

Multiphoton excitation of a model negative ion is studied. The model has only a single bound level, and we choose a photon frequency appropriate to five-photon photodetachment (before ponderomotive threshold shifts). Both of these characteristics are compatible with multiphoton detachment studies of the hydrogen negative ion made with CO{sub 2} laser radiation. We study the model in a discretized energy basis in order to study independently the influence of bound--continuum (B--C) and continuum--continuum (C--C) dipole matrix elements on the multiphoton detachment process. Because the energy-level structure of the model (and also of negative ions generally) is relatively simple compared with that of atoms, we are able to investigate a number of questions in some detail, using either perturbation theory or exact numerical solutions to Schroedinger's equation. Interesting consequences are the explicit identification of an interference between B--C-dominated and C--C-dominated detachment channels and the emergence of energy-nonconserving contributions to above-threshold electron spectra.

• OSTI ID: 6851163
• Journal Information: Journal of the Optical Society of America, Part B: Optical Physics; (USA), Journal Name: Journal of the Optical Society of America, Part B: Optical Physics; (USA) Vol. 7:4; ISSN JOBPD; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
CHARGED PARTICLES
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
ELECTRON DETACHMENT
ELECTRON SPECTRA
ENERGY-LEVEL DENSITY
EQUATIONS
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
IONIZATION
IONS
LASER RADIATION
MATHEMATICAL MODELS
MULTI-PHOTON PROCESSES
NUMERICAL SOLUTION
PARTIAL DIFFERENTIAL EQUATIONS
PERTURBATION THEORY
PHOTOIONIZATION
POWER
POWER RANGE 01-10 TW
PULSES
QUANTUM ELECTRONICS
RADIATIONS
SCHROEDINGER EQUATION
SPECTRA
WAVE EQUATIONS