Channel coupling and shape resonance effects in the photoelectron angular distributions of the 3sigma/sub g//sup -1/ and 2sigma/sub u//sup -1/ channels of N/sub 2/

Journal Article · Sat Feb 01 04:00:00 EST 1986 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.33.1020· OSTI ID:6367044

Southworth, S H; Parr, A C; Hardis, J E; Dehmer, J L

We report measurements of photoelectron angular distributions for the 3sigma/sub g//sup -1/ and 2sigma/sub u//sup -1/ photoionization channels of N/sub 2/ from their thresholds up to 35 and 37.5 eV, respectively. The asymmetry parameter ..beta.. for the 2sigma/sub u//sup -1/ channel exhibits a broad dip in the range h..nu..approx.27--32 eV that was recently predicted theoretically to arise from shape-resonance-enhanced continuum-continuum coupling between the 3sigma/sub g//sup -1/ and 2sigma/sub u//sup -1/ ionization channels. The ..beta.. parameter for the 3sigma/sub g//sup -1/ channel exhibits a prominent feature at h..nu..approx.23 eV, which is tentatively attributed to the autoionization of a doubly excited valencelike state. Otherwise, the gross shape of the 3sigma/sub g//sup -1/ ..beta.. curve is in good agreement with independent-electron calculations, which realistically reflect the influence of the well-known sigma/sub u/ shape resonance in this channel.

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 6367044
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 33:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
IONIZATION
NITROGEN
NONMETALS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RADIATIONS
SPECTROSCOPY
SYNCHROTRON RADIATION