Energy level values, with designations and uncertainties, have been compiled for the spectra of the neutral atom and all positive ions of cesium (Z=55). Transition wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addition, ground states, ionization energies, and hyperfine structure constants are listed. For most ionization stages experimental data are available; however, for those for which only theoretical calculations or fitted values exist, these are reported. There are a few ionization stages for which only a calculated ionization potential is available.

Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Cesium (CsI–CsLV)

The paper reviews both the properties and the applications of core-excited metastable atoms. The production of these atoms by microwaves, pulsed hollow-cathode discharges, and laser-produced x rays is described. We discuss the application of these atoms to several new types of spectroscopy that allow autoionizing linewidths as narrow as 0.1 cm−1 to be measured. The application of these metastables to the generation of picosecond-time-scale soft-x-ray pulses and to XUV lasers is also discussed.

Core-excited metastable levels: application to spectroscopy, to the generation of picosecond extreme-ultraviolet pulses, and to lasers

Spectroscopic studies of highly excited Rb atoms were performed with continuously tunable coherent extreme-ultraviolet radiation generated by four-wave mixing in Kr and Xe. The excitation energy of the core-excited state 4p55s2 2P3/2 and the absorption cross section for the transition from the ground state to the excited state were measured to be 123497.5 ± 0.5 cm−1 and (2.1 ± 0.6) × 10−16 cm2 at the absorption peak, respectively; the oscillator strength for the transition and the excited-state lifetime for autoionization were also determined. Absorption measurements were made for the transition from the low-lying excited state 5p 2P3/2 to the quasi-metastable quartet state 4p55s5p4S3/2, which yielded the excitation energy, 134250.2 ± 0.5 cm−1, of the quartet state.

Extreme-ultraviolet laser spectroscopy of core-excited Rb atoms

Satellite two-electron radiative transitions due to relaxation effects.

Operation of a 109-nm Auger Laser in Xe III and high gain on the 131-nm line of Zn III is reported. Progress and improvements on the depletion-spectroscopy technique are also reported.

Research studies on extreme-ultraviolet and soft-x-ray lasers. Annual technical report, 1 September 1986-31 August 1987

The 109.1-nm transition in neutral Cs is the prototype of a class of transitions that originate from doubly excited quasi-metastable quartet levels. In this Letter we describe experiments that use tunable VUV radiation to determine the identity of this transition, to measure its oscillator strength, and to estimate its hyperfine splitting.

/pdf/identification-and-oscillator-strength-measurement-of-the-232yc6h46p.pdf

Identification and oscillator-strength measurement of the 109.1-nm transition in neutral Cs.

Absorption of tunable coherent VUV radiation is used to measure fine‐structure splitting and oscillator strength, and to estimate hyperfine splitting of the Cs 109.1 nm transition, which originates on a quasi‐metastable level.

Laser spectroscopy of the 109.1-nm transition in neutral Cs

Laser spectroscopy of the 109.1 nm transition in neutral Cs

The paper summarizes the properties of certain radiating levels of the column I metals. XUV emission studies and an absorption experiment on the 1091 A line of neutral Cs are described. A technique for correlating picosecond, broadband XUV pulses is discussed.

D. P. Dimiduk

Papers

Identification and oscillator-strength measurement of the 109.1-nm transition in neutral Cs.

Laser spectroscopy of the 109.1-nm transition in neutral Cs

Laser spectroscopy of the 109.1 nm transition in neutral Cs

Quasi-Metastable Energy Levels and Applications