Scaled electron ionization cross sections in the Born approximation for atoms with 55< or =Z< or =102

Journal Article · Wed Aug 01 00:00:00 EDT 1979 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.20.445· OSTI ID:6248316

McGuire, E J

Using the generalized oscillator-strength formulation of the Born approximation, the author calculated electron ionization cross sections for all significant subshells of every fourth atom with 58< or =Z< or =102, and for Hg. The calculations used approximate Herman-Skillman wave functions and eigenvalues. The cross sections were put in scaled form, depending essentially on ionization energy only. The scaled cross sections were used with experimental energies to calculate the cross sections for Cs, Cs/sup +/, Ba, Ba/sup +/, Au, Hg, Tl, Tl/sup +/, and Pb. The cross sections so calculated were in good agreement with the measurements. Both inner-shell ionization and excitation followed by autoionization were prominent contributors to the cross section. The scaling procedure was used to calculate the electron ionization cross section of the noble-gas metastable levels, and there is excellent agreement with measured values for Ne and A. The scaling procedure was used to calculate cross sections for the sequential ionization Ni/sup +1/--Ni/sup +14/ and Au/sup +3/--Au/sup +14/, which were compared with cross sections obtained from the semiempirical expression of Lotz. Good agreement was found for the Ni ions, but there was poor agreement for the Au ions. Lotz's expression is a factor of 3 smaller than our scaled cross section for the 4d, 4f, and 5d subshells. It is suggested that the absence of measurements on these subshells precluded correct parametrization in the semiempirical expression of Lotz.

• Research Organization: Sandia Laboratories, Albuquerque, New Mexico 87115
• OSTI ID: 6248316
• Journal Information: Phys. Rev., A; (United States), Vol. 20:2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BARIUM
ELECTRON-ATOM COLLISIONS
BARIUM IONS
ELECTRON-ION COLLISIONS
CESIUM
IONIZATION
CESIUM IONS
GOLD
LEAD
MERCURY
THALLIUM
THALLIUM IONS
TRANSURANIUM ELEMENTS
BORN APPROXIMATION
CROSS SECTIONS
ALKALI METALS
ALKALINE EARTH METALS
ATOM COLLISIONS
ATOMIC IONS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ELEMENTS
ION COLLISIONS
IONS
METALS
TRANSITION ELEMENTS
640304* - Atomic
Molecular &amp; Chemical Physics- Collision Phenomena