Near-infrared multiphoton ionization of cesium

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.30.1775· OSTI ID:6045929

Christian, W; Compton, R N; Stockdale, J A.D.; Miller, J C; Cooper, C D; Tang, X; Lambropoulos, P

Experimental and theoretical results are presented for resonantly enhanced three-photon ionization of cesium atoms in the wavelength range from 830 to 950 nm. The accidental near resonance of the 6p /sup 2/P/sub 3/2,1/2/ levels at the one-photon energy and the near resonance at the two-photon level with the 6d /sup 2/D/sub 3/2,5/2/ states gives rise to large ionization signals and interesting anomalies in the relative intensities of the fine-structure levels. ''Hybrid resonances'' are observed which involve the production of 6p /sup 2/P/sub 1/2/ atoms from molecular cesium. One hybrid resonance involves ionization of the 6p /sup 2/P/sub 1/2/ state via an electric quadrupole transition (6p /sup 2/P/sub 1/2/--7p /sup 2/P/sub 3/2/). Both experimental and theoretical photoelectron angular distributions are compared for all of the observed resonances except for the 6p /sup 2/P/sub 3/2/ state where the signals were too weak for such a measurement. Agreement between experiment and theory is fair for three-photon ionization via the 6p /sup 2/P/sub 1/2/ state. Comparison of experiment and theory for the case of the 6d /sup 2/D/sub 3/2,5/2/ states indicates that hyperfine coupling during the laser-pulse duration may be important. The angular distributions for the hybrid resonances show the general behavior predicted by theory but the features appear broadened.

• Research Organization: Chemical Physics Section, Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6045929
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 30:4; 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
ALKALI METALS
ANGULAR DISTRIBUTION
CESIUM
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
INFRARED RADIATION
IONIZATION
METALS
MULTI-PHOTON PROCESSES
NEAR INFRARED RADIATION
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RADIATIONS
SPECTROSCOPY