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Quantitative study of multiphoton multiple ionization: Second-harmonic Nd:YAG laser ionization of the doubly excited 2[ital p][sup 2] [sup 3][ital P] bound state of H[sup [minus]]

Journal Article · · Physical Review A; (United States)
;  [1]
  1. Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vasileos Constantinou Avenue, 11635 Athens (Greece)
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Starting with the H[sup [minus]] 2[ital p][sup 2] [sup 3][ital P] excited bound state, we have studied the problem of direct versus sequential two-photon, two-electron ionization with linearly polarized laser light of [lambda]=5320 A and intensity [ital I]=1.4[times]10[sup 9] W/cm[sup 2]. The theory is nonperturbative and electronic-structure oriented. It allows for the multiconfigurational zero-order representation of bound and autoionizing states, for electron correlation, and for the effects of nonorthonormality which cause multielectron excitation even without correlation corrections. The one- and two-electron multichannel continua are represented by square-integrable complex exponential functions. The results show that the sequential process is dominant, even though there exists the H[sup [minus]] 4[ital s]4[ital p] [sup 3][ital P][degree] autoionizing state, which is near resonance. However, the direct process would dominate if the autoionization width, which is computed to be 1.16[times]10[sup [minus]3] a.u., happened to be smaller by about a factor of 100, which is a realistic possibility for other systems.

OSTI ID:
6429918
Journal Information:
Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:1; ISSN 1050-2947; ISSN PLRAAN
Country of Publication:
United States
Language:
English

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Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
BOUND STATE
CHARGED PARTICLES
ENERGY LEVELS
EXCITED STATES
FREQUENCY MIXING
HARMONIC GENERATION
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
IONIZATION
IONS
LASERS
MANY-BODY PROBLEM
MULTI-PHOTON PROCESSES
NEODYMIUM LASERS
PHOTOIONIZATION
SOLID STATE LASERS
TWO-BODY PROBLEM