Photoabsorption windows for Na and Na{sub 2}{sup +}

Journal Article · Fri Dec 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.062710· OSTI ID:20976481

Xiaoying, Han ^[1]; Xiang, Gao ^[2]; Jiaming, Li ^[2]; Voky, Lan; Feautrier, Nicole ^[3]

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1. Key Laboratory of Atomic and Molecular Nanosciences of Education Ministry, Department of Physics, Tsinghua University, Beijing 100084 (China)
2. Department of Physics, Shanghai Jiao Tong University, Shanghai 200230 (China)
3. LERMA, UMR 8112 du CNRS, Observatoire de Paris, 92915 Meudon Cedex (France)

There exist absorption windows (i.e., Cooper-minima) in the photoabsorption cross sections of some atomic systems because of the relative phase shifts between the initial and final state wave functions due to the atomic screening potentials in contrast to the Coulomb potentials. Such window positions are sensitive to the accuracy of the initial and final state wave functions. Using our modified Breit-Pauli R-matrix code, the photoionization cross sections of ground Na are calculated. Our calculated cross sections and minimum position in the low photoelectron energy range (<9 eV) are in excellent agreement with the experimental results. In the high energy range (>9 eV), there is an abnormal bump in the experimental measurements, which is a long-standing experimental puzzle. It is interesting to note that there is also an absorption window in the photoabsorption (i.e., photodissociation) cross sections of Na{sub 2}{sup +}. Such an absorption window provides an answer to the puzzle.

• OSTI ID: 20976481
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
CATIONS
COULOMB FIELD
CROSS SECTIONS
DISSOCIATION
EV RANGE
GROUND STATES
PHASE SHIFT
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
PHOTON-MOLECULE COLLISIONS
R MATRIX
SODIUM
SODIUM IONS
WAVE FUNCTIONS