Angular momentum dependence of photoionization cross sections from the excited states of lithium

Journal Article · Wed Nov 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.052705· OSTI ID:20974741

Hussain, Shahid; Saleem, M; Baig, M A ^[1]

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1. Atomic and Molecular Physics Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad 45320 (Pakistan)

We present new measurements of photoionization cross sections from the 4s {sup 2}S, 4p {sup 2}P, and 4d {sup 2}D excited states of lithium, above the first ionization threshold. The experiments have been conducted using two dye lasers pumped by a Nd:yttrium aluminum garnet (YAG) laser in conjunction with a thermionic diode ion detector and pump-probe saturation technique. The behavior of the photoionization cross sections from n=4 and l=0,1,2 excited states have been investigated. A smooth wavelength dependence of photoionization cross sections has been observed for the 4p and 4d excited states, which decrease monotonically with the decrease in the ionizing laser wavelength; however, the falloff for the 4d excited state is purely hydrogenic. The cross section for the 4s excited state first increases, attains a maximum value, and then decreases monotonically with a decrease in the ionizing wavelength - strictly nonhydrogenic. The measured values of the cross section are compared with the earlier theoretical work.

• OSTI ID: 20974741
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALUMINIUM OXIDES
ANGULAR MOMENTUM
CROSS SECTIONS
ELECTRONIC STRUCTURE
EXCITED STATES
FREQUENCY DEPENDENCE
ION DETECTION
LITHIUM
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
PUMPING
SATURATION
THERMIONIC DIODES