C. Kurtz

Measurement of the 6p2P3/2 state lifetime in atomic cesium.

We present a precision experimental test of atomic many-body theory that is currently applied to the interpretation of recent parity-nonconservation experiments in atomic cesium. We report the first measurement of the {sup 133}Cs 6{ital p} {sup 2}{ital P}{sub 3/2} state lifetime using resonant diode-laser excitation of a fast atomic beam. The lifetime result of 30.55{plus minus}0.27 ns determines the absorption oscillator strength for the 6{ital s} {sup 2}{ital S}{sub 1/2}--6{ital p} {sup 2}{ital P}{sub 3/2} transition in cesium to be 0.7133{plus minus}0.0064, and establishes the accuracy of recent relativistic many-body calculations of the dipole transition matrix element to 0.5%.

Delayed beam-foil spectra of 3 MeV Ar ions

Abstract The VUV spectrum of foil-excited argon ions has been observed with time delays of up to 20 ns after excitation in a search for the intercombination lines of Mg-, Al- and Si-like ions. In Ar 6+ the intercombination line has been identified and its wavelength has been determined with a precision equal to that achieved in a recent tokamak experiment. In Ar 5+ and Ar 4+ the signal is expected to be lower by one order of magnitude because of the longer lifetimes. We discuss possible identifications of very weak lines with the transitions of interest.

Doubly-excited levels in Al III☆

Abstract We have used the beam-foil technique to search for transitions between the doubly-excited quartet levels in Al III. These levels, due to excitation of an inner-shell 2p electron, lead to radiation in the range of 900 to 1500 A. Calculations using a multiconfigurational Dirac Fock code have enabled us to propose preliminary identification of a number of transitions in this wavelength region.

Precision lifetime measurements using laser excitation of a fast atomic beam

Abstract We employ resonant laser excitation of a fast atomic beam to measure excited state lifetimes by observing the decay-in-flight of the emitted fluorescence. Our program includes lifetime measurements of the low lying p states in alkali and alkali-like systems. This work was initiated by the motivation to test the atomic many-body-perturbation theory that is necessary for interpretation of parity nonconservation experiments in cesium. We report new measurements of the 6p 2 P 1 2 and 6p 2 P 3 2 state lifetimes in the 133Cs atom to be 34.934 ± 0.094 ns and 30.499 ± 0.070 ns respectively. With minor changes to the apparatus, we have extended our measurement capabilities to include the 2p 2 P 1 2 , 3 2 states of lithium. We present comparisons between measurements and relativistic calculations of atomic transition matrix elements.

Measurement of the 6 p sup 2 P sub 3/2 state lifetime in atomic cesium

We present a precision experimental test of atomic many-body theory that is currently applied to the interpretation of recent parity-nonconservation experiments in atomic cesium. We report the first measurement of the {sup 133}Cs 6{ital p} {sup 2}{ital P}{sub 3/2} state lifetime using resonant diode-laser excitation of a fast atomic beam. The lifetime result of 30.55{plus minus}0.27 ns determines the absorption oscillator strength for the 6{ital s} {sup 2}{ital S}{sub 1/2}--6{ital p} {sup 2}{ital P}{sub 3/2} transition in cesium to be 0.7133{plus minus}0.0064, and establishes the accuracy of recent relativistic many-body calculations of the dipole transition matrix element to 0.5%.

Measurement of the 6p2P3/2state lifetime in atomic cesium

We present a precision experimental test of atomic many-body theory that is currently applied to the interpretation of recent parity-nonconservation experiments in atomic cesium. We report the first measurement of the {sup 133}Cs 6{ital p} {sup 2}{ital P}{sub 3/2} state lifetime using resonant diode-laser excitation of a fast atomic beam. The lifetime result of 30.55{plus minus}0.27 ns determines the absorption oscillator strength for the 6{ital s} {sup 2}{ital S}{sub 1/2}--6{ital p} {sup 2}{ital P}{sub 3/2} transition in cesium to be 0.7133{plus minus}0.0064, and establishes the accuracy of recent relativistic many-body calculations of the dipole transition matrix element to 0.5%.