Spectrum and energy levels of singly ionized cesium (Cs II)

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6247993

Sansonetti, C J

The cesium spectrum emitted by a pulsed radio-frequency discharge has been measured in the 1550 A to 4 ..mu..m spectral region using concave grating spectrographs, Fabry-Perot interferometry, and Fourier spectroscopy. The source was adjusted to optimize the excitation of singly ionized cesium, and 1732 lines believed to belong to Cs II were observed. Most of these lines (1677) have been classified as transitions between 118 even and 170 odd energy levels. Of these 288 levels, 236 were located as a result of this experimental work. All of the low-lying Cs II configurations are complete and have been interpreted by least-squares analysis to obtain empirical energy parameters and intermediate-coupling wave functions. Most excited configurations show rather than jK coupling, hence all levels have been assigned designations in the jK coupling notation. The hyperfine structure that is a prominent feature of many Cs II lines has been studied extensively by analyzing hyperfine patterns in high-resolution Fourier spectra. Hyperfine splitting constants have been determined for 167 levels. No attempt has been made to give a theoretical interpretation of the splitting factors, but regularities in the splitting constants which have been used in a phenomenological way to aid in the classification of energy levels have been noted. A number of Rydberg series of levels with as many as 7 to 11 members have been found and used to estimate the Cs II ionization limit by fitting an extended Ritz formula to the observed levels. In addition to Cs II transitions, many lines belonging to Cs I and Cs III were observed. The Cs I data include nearly 100 lines with wavelengths greater than 1 ..mu..m.

• Research Organization: Purdue Univ., Lafayette, IN (USA)
• OSTI ID: 6247993
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CESIUM IONS
CHARGED PARTICLES
CORRECTIONS
COUPLING
DATA
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
HYPERFINE STRUCTURE
INFORMATION
INFRARED RADIATION
INTERFEROMETRY
INTERMEDIATE COUPLING
IONS
L-S COUPLING
NUMERICAL DATA
RADIATIONS
RITZ METHOD
RYDBERG CORRECTION
SPECTRA
SPECTROSCOPY
ULTRAVIOLET RADIATION
VISIBLE RADIATION