Trapping of Non-Resonance Radiation in Atoms and its Influence on Measured Lifetimes of the 4p and 5p Levels in Ar I
- 1 April 1978
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. 17 (4) , 473-477
- https://doi.org/10.1088/0031-8949/17/4/014
Abstract
Lifetimes of 17 levels of the 3p 5 4p and 3p 5 5p configurations in Ar I have been measured using the High Frequency Deflection technique at target pressures in the range 0.04-10 mtorr. An anomalous pressure dependence is found which indicates that the studied 4p, 5p → 4s (non-resonance) transitions are subjected to trapping effects which occur because of exceptionally long lifetimes of the 4s levels due to either 4s → 3p resonance trapping (4s, J = 1) or metastability (4s, J = 0, 2). A theoretical fit to the observed pressure dependence based upon this process is given as well as corrected zero pressure lifetimes which in several cases are considerably shorter than earlier published values.Keywords
This publication has 24 references indexed in Scilit:
- Resonance trapping at low pressuresPhysical Review A, 1976
- Measurement of metastable-state densities by self-absorption techniqueJournal of Quantitative Spectroscopy and Radiative Transfer, 1975
- High Resolution Measurements of Atomic and Molecular Lifetimes Using the High Frequency Deflection TechniquePhysica Scripta, 1975
- Mesures des densites locales d'atomes metastables dans un arc stabilise par paroisJournal of Quantitative Spectroscopy and Radiative Transfer, 1975
- Oscillator strengths for neutral sodium and the interstellar sodium abundance in zeta Ophiuchi.The Astrophysical Journal, 1974
- Lifetimes of the 3p55pLevels in Ar IPhysica Scripta, 1973
- Transition Probabilities and Mean Lives of theLaser Level in Neon IPhysical Review B, 1969
- Effect of Imprisonment of Radiation in Sodium Vapor on the Measured Lifetime of theStatesPhysical Review B, 1967
- Measurements of lifetimes of excited states of helium atomsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1956
- Imprisonment of Resonance Radiation in Gases. IIPhysical Review B, 1951