Complex quantum defects of superexcited Rydberg states of H sub 2

Journal Article · Sat Mar 31 23:00:00 EST 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.3545· OSTI ID:7002970

Shimamura, I ^[1]; Noble, C J ^[2]; Burke, P G ^[3]

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1. United Kingdom Science, Daresbury Laboratory, Warrington WA44AD, England (GB) Engineering Research Council, Daresbury Laboratory, Warrington WA44AD, England (GB) RIKEN (Institute of Physical and Chemical Research), Wako, Saitama 351-01, Japan (JP)
2. United Kingdom Science, Daresbury Laboratory, Warrington WA44AD, (England) Engineering Research Council, Daresbury Laboratory, Warrington WA44AD, England (GB)
3. Department of Applied Mathematics, The Queen's University of Belfast, Belfast BT71NN, (Northern Ireland) Theoretical Physics, The Queen's University of Belfast, Belfast BT71NN, Northern Ireland (IE)

The {ital R}-matrix method for electron-molecule collisions has been applied to autoionizing doubly excited adiabatic states of H{sub 2} with {sup 1}{Sigma}{sub {ital g}}{sup +} symmetry for internuclear distances from 1 to 5 a.u. Above the previously known three states we have found many other doubly excited states for the first time. These states are classified into two Rydberg series, namely, (1{sigma}{sub {ital u}})({ital np}{sigma}) and (1{sigma}{sub {ital u}})({ital nf}{sigma}) series up to {ital n}=10. They are characterized by their complex quantum defect, the imaginary part corresponding to the width of each Rydberg state. For the smaller internuclear distances {ital R} these Rydberg states are isolated resonances, but for {ital R}{gt}4 a.u. some of them begin to overlap and present a problem of multichannel autoionizing Rydberg series, although there is only one common series limit in the present case. This work exemplifies the usefulness of the {ital R}-matrix method for studying molecular doubly excited Rydberg states.

• OSTI ID: 7002970
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:7; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AUTOIONIZATION
COLLISIONS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
IONIZATION
MATRICES
MOLECULE COLLISIONS
NONMETALS
R MATRIX
RYDBERG STATES
SYMMETRY