[en] The two metastable levels 5d(2)D(3/2) and 5d(2) D-5/2 in Ba II both show extremely long lifetimes of the order of several tens of seconds each. This has been found both by experiments and by theoretical predictions. The small transition probabilities associated with these two levels make them interesting and challenging for theoreticians as well as for experimentalists. Several calculations and measurements of these two lifetimes have been made previously but discrepancies between the results are present. This article presents values of τ = 89.4 +/- 15.6 s for the D-2(3/2) level and τ = 32.0 +/- 4.6 s for the D-2(5/2) level measured in a beam-laser experiment performed at the ion storage ring CRYRING. These values are supported by our new calculations resulting in τ= 82.0 s for the D-2(3/2) level and τ= 31.6 s for the D-2(5/2) level.
C. E. Moore, Atomic Energy Levels (NSRDS-NBS, Washington, 1958), Vol. II.
J. J. Curry, J. Phys. Chem. Ref. Data JPCRBU 0047-2689 10.1063/1.1643404 33, 725 (2004).
R. Schneider and G. Werth, Z. Phys. A ZPAADB 0340-2193 10.1007/BF01559751 293, 103 (1979).
N. Yu, W. Nagourney, and H. Dehmelt, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.78.4898 78, 4898 (1997).
F. Plumelle, M. Desaintfuscien, J. L. Duchene, and C. Audoin, Opt. Commun. OPCOB8 0030-4018 10.1016/0030-4018(80)90162-5 34, 71 (1980).
W. Nagourney, J. Sandberg, and H. Dehmelt, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.56.2797 56, 2797 (1986).
A. A. Madej and J. D. Sankey, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.41.2621 41, 2621 (1990).
B. Warner, Mon. Not. R. Astron. Soc. MNRAA4 0035-8711 139, 115 (1968).
R. H. Garstang, J. Res. Natl. Bur. Stand., Sect. A JNBAAR 0022-4332 68, 61 (1964).
C. Guet and W. R. Johnson, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.44.1531 44, 1531 (1991).
V. A. Dzuba, V. V. Flambaum, and J. S. M. Ginges, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.63.062101 63, 062101 (2001).
G. Gopakumar, H. Merlitz, R. K. Chaudhuri, B. P. Das, U. S. Mahapatra, and D. Mukherjee, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.66.032505 66, 032505 (2002).
B. K. Sahoo, M. R. Islam, B. P. Das, R. K. Chaudhuri, and D. Mukherjee, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.74.062504 74, 062504 (2006).
R. D. Cowan, The Theory of Atomic Structure and Spectra (University of California Press, Berkeley, 1981).
P. Quinet and J. E. Hansen, J. Phys. B JPAPEH 0953-4075 10.1088/0953-4075/28/7/003 28, L213 (1995).
J. Lidberg, A. Al-Khalili, L.-O. Norlin, P. Royen, X. Tordoir, and S. Mannervik, Nucl. Instrum. Methods Phys. Res. B NIMBEU 0168-583X 10.1016/S0168-583X(98)00973-2 152, 157 (1999).
S. Mannervik, A. Ellmann, P. Lundin, L.-O. Norlin, D. Rostohar, P. Royen, and P. Schef, Phys. Scr. PHSTBO 0031-8949 10.1088/0031-8949/2005/T119/009 T119, 49 (2005).
A. Gallagher, Phys. Rev. PHRVAO 0031-899X 10.1103/PhysRev.157.24 157, 24 (1967).
H. J. Andrä, A. Gaupp, and W. Wittmann, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.31.501 31, 501 (1973).
H. Harde and G. Guthohrlein, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.10.1488 10, 1488 (1974).
A. Arnesen, A. Bengtsson, R. Hallin, S. Kandela, T. Noreland, and R. Lidholt, Phys. Lett. PYLAAG 0375-9601 53A, 459 (1975).
H. Winter and M. Gaillard, Z. Phys. A ZPAADB 0340-2193 10.1007/BF01408177 281, 311 (1977).
A. Ellmann, Ph.D. thesis, Stockholm University, Stockholm, 2003.
W. Demtröder, Laser Spectroscopy, Basic Concepts and Instrumentation, 2nd ed. (Springer, Berlin, 1998).
C. Knab-Bernardini, H. Knab, F. Vedel, and G. Werth, Z. Phys. D: At., Mol. Clusters ZDACE2 0178-7683 10.1007/BF01426681 24, 339 (1992).
S. Mannervik, J. Lidberg, L.-O. Norlin, and P. Royen, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.56.R1075 56, R1075 (1997).
H. Hartman, D. Rostohar, A. Derkatch, P. Lundin, P. Schef, S. Johansson, H. Lundberg, S. Mannervik, L.-O. Norlin, and P. Royen, J. Phys. B JPAPEH 0953-4075 10.1088/0953-4075/36/13/101 36, L197 (2003).