Precision lifetime measurements on alkali atoms and on helium by beam–gas–laser spectroscopy
- 1 January 1996
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. T65 (T65), 48-56
- https://doi.org/10.1088/0031-8949/1996/t65/007
Abstract
The results of a new series of precision lifetime measurements on alkali atoms by means of beam–gas–laser spectroscopy are reported and discussed. The lifetimes of the first excited states in lithium, sodium, potassium and rubidium were measured with uncertainties ranging from ±0.14% to ±0.25%. The results are discussed in comparison with other recent experimental and theoretical work. The longstanding discrepancy between ab initio line strength calculations and the measurements of Gaupp et al. [Phys. Rev. A26, 3351 (1982)] for the resonance transitions in lithium and sodium is resolved by the new measurements in favour of the theoretical calculations. Finally the role of the beam divergence in lifetime measurements on fast particle beams is discussed and a method to correct for this effect is presented. The importance of the beam divergence effect is illustrated by additional recent lifetime measurements on helium and on lithium.Keywords
This publication has 43 references indexed in Scilit:
- Multiconfiguration Hartree–Fock calculations of atomic properties in light atomsPhysica Scripta, 1996
- Theoretical lithium 2S→2P and 2P→3D oscillator strengthsPhysical Review A, 1995
- Gauge-invariant approach to the calculation of transition probabilities for many-electron atomsPhysical Review A, 1994
- Convergence studies of atomic properties from variational methods: total energy, ionization energy, specific mass shift, and hyperfine parameters for LiPhysica Scripta, 1993
- Accurate variational calculations of energies of the 2S, 2P, and 3Dstates and the dipole, quadrupole, and dipole-quadrupole polarizabilities and hyperpolarizability of the lithium atomPhysical Review A, 1992
- The calculation of atomic oscillator strengths: the lithium atom revisitedCanadian Journal of Chemistry, 1992
- Matrix elements in the coupled-cluster approach - with application to low-lying states in LiPhysica Scripta, 1990
- Using the hadronic multiplicity to distinguish realW’s from QCD jet backgroundsPhysical Review D, 1989
- Atomic data for opacity calculations. IX. The lithium isoelectronic sequenceJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Accurate lifetime measurements of the loweststates in neutral lithium and sodiumPhysical Review A, 1982