Circular dichroism and photoelectron angular distributions of excited states of cesium and rubidium using resonantly enhanced multiphoton ionization techniques

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1993

OSTI ID:7003613

Cuellar, L E

Resonantly enhanced multiphoton ionization (REMPI) techniques are used to study spin-orbit effects in the photoelectron angular distributions (PEAD) of excited ns (n = 8-13) states of cesium. The asymmetry parameters are shown to exhibit an energy dependence in the region of the Cooper minimum of the photoionization cross section, supporting predictions made by inclusion of relativistic coupling in the continuum. REMPI is also used to study the photoelectron angular distribution of excited n[sup 2]P[sub 3/2] and n[sup 2]P[sub 1/2] state of cesium and rubidium. The measured asymmetry parameters for the PEADs of n[sup 2]P[sub 3/2] states are found to deviate signi ficantly from theoretical predictions. The difference is attributed to depolarization of the angular momentum polarization due to hyperfine coupling. Circular dichroism effects in the photoelectron angular distributions (CDAD) are used to measure alignment of the excited n[sup 2]P[sub 3/2] states of cesium and rubidium. Angular distributions of the n[sup 2]P[sub 1/2] states are used to show that isotropic states do not exhibit CDAD.

• Research Organization: Tennessee Univ., Knoxville, TN (United States)
• OSTI ID: 7003613
• Country of Publication: United States
• Language: English

Related Subjects

664400* -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
CESIUM
COUPLING
ELEMENTS
ENERGY LEVELS
EXCITED STATES
INTERMEDIATE COUPLING
L-S COUPLING
METALS
RUBIDIUM