Abstract
Promptly decaying levels in Li- and Be-like Ar could be identified in the delayed x-ray and electron spectrum in addition to the four known metastable (1s2s)1 S 0, (1s2s)3 S 1, (1s2p)3 P 2, and (1s2s2p)4 P 5/2 states in He- and Li-like systems. The states having lifetimes of about 10−14s still contribute to the spectrum observed 10−9s after the ions have passed a foil. This observation is explained by cascading processes from states of high principal quantum numbern≧14. The measured lifetime of the4 P 5/2 state subtracting the contribution of cascades is (0.594±0.016) ns and slightly larger than the theoretically predicted value of 0.563 ns. The3 P 2 state is depopulated at short distances behind the foil by cascading processes. Its measured lifetime of (1.44±0.08) ns compares to a theoretical value of 1.48 ns.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Cheng, K.T., Lin, C.P., Johnson, W.R.: Phys. Lett.48A, 437 (1974)
Richard, P., Kauffmann, R.L., Hopkins, F.F., Woods, C.W., Jamison, K.A.: Phys. Rev. A8, 2187 (1973)
Richard, P., Kauffmann, R.L., Hopkins, F.F., Woods, C.W., Jamison, K.A.: Phys. Rev. Letters30, 888 (1973)
Dohmann, H.D., Pfeng, H.: Z. Physik A288, 29 (1978)
House, L.L.: Astrophys. J. Suppl.18, 21 (1969)
Gabriel, A.H.: Mon. Not. R. astr. Soc.160, 99 (1972)
Johnson, W.R., Lin, C.D.: Phys. Rev. A14, 565 (1976)
Cheng, K.T., Desclaux, J.P., Kim, Y.K.: J. Phys. B11, L359 (1978)
Fricke, B.: Dirac-Fock-calculations
Hopkins, F., v. Brentano, P.: J. Phys. B9, 775 (1976)
Chen, M.H., Craseman, B.: Phys. Rev. A12, 959 (1975)
Bely-Dubau, F., Gabriel, A.H., Volonte, S.: Mon. Not. R. astr. Soc.186, 405 (1979)
Dohmann, H.D., Liesen, D., Pfeng, H.: Z. Physik A285, 171 (1978)
Donnally, B., Smith, W.W., Pegg, D.J., Brown, M., Sellin, A.: Phys. Rev. A4, 122 (1971)
Drake, G.W.F., Victor, G.A., Dalgarno, A.: Phys. Rev.180, 25 (1969)
Marrus, R., Schmieder, R.W.: Phys. Rev. A5, 1160 (1972)
Lin, C.D., Johnson, W.R., Dalgarno, A.: Phys. Rev. A15, 154 (1977)
Cocke, C.L., Curnutte, B., Macdonald, J.R., Randall, R.: Phys. Rev. A9, 57 (1974)
Cocke, C.L., Curnutte, B., Randall, R.: Phys. Rev. A9, 1823 (1974)
Pegg, D.J., Haselton, H.H., Griffin, P.M., Lambert, R., Mowat, J.R., Peterson, R., Sellin, I.A.: Phys. Rev. A9, 1112 (1974)
Sellin, I.A., Pegg, D.J., Griffin, P.M.: Phys. Rev. Lett.28, 1229 (1972)
Author information
Authors and Affiliations
Additional information
We thank H. Pfeng for assistance during the measurements and W. Rösch for the development of the electronics. Essential improvements of the crystal spectrometer were made by Dr. H.H. Behncke. For many helpful discussions we thank Drs. F. Folkmann and S. Hagmann.
Rights and permissions
About this article
Cite this article
Dohmann, H.D., Mann, R. Measurement of the lifetime of the3 P 2 and4 P 5/2 states in Ar16+ and Ar15+ . Z Physik A 291, 15–22 (1979). https://doi.org/10.1007/BF01415809
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01415809