Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-26T18:58:43.053Z Has data issue: false hasContentIssue false
  • English
  • Français

Oscillator Stengths and Their Uncertainties

Published online by Cambridge University Press:  16 November 2010

R. Monier ,
B. Smalley ,
G. Wahlgren ,
Ph. Stee  and
G. M. Wahlgren
G. M. Wahlgren*
Affiliation:
Dept. of Physics, Catholic University of America, 620 Michigan Ave NE, Washington DC 20064, USA NASA Goddard Space Flight Center, Code 667, Greenbelt, MD 20771, USA. e-mail: [email protected]
Get access

Abstract

The oscillator strength is a key parameter in the description of the line absorption coefficient. It can be determined through experiment, abinitio and semi-empirical calculations, and backward analysis of line profiles. Each method has its advantages, and the uncertainty attached to its determination can range from low to indeterminable. For analysis of line profiles or equivalent widths the uncertainty in the oscillator strength can rival or surpass the difference between the derived element abundance from classical LTE and non-LTE analyses. It is therefore important to understand the nature of oscillator strength uncertainties and to assess whether this uncertainty can be a factor in choosing to initiate a non-LTE analysis or in the interpretation of its results. Methods for the determination of the oscillator strength are presented, prioritizing experiments, along with commentary about the sources and impact of the uncertainties. The Se I spectrum is used to illustrate how gf-values can be constructed from published data on atomic lifetimes and line intensities.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 43: Non-LTE Line Formation for Trace Elements in Stellar Atmospheres , 2010 , pp. 91 - 114
Copyright
© EAS, EDP Sciences 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bashkin, S., 1964, Nucl. Instr. Meth., 28, 88 CrossRef
Beiersdorfer, R., 2008, Can. J. Phys., 86, 1 CrossRef
Beiersdorfer, R., 2009, Phys. Scripta, T134, 014010 CrossRef
Bengtsson, G.J.,Berzinsh, U.,Larsson, J., & Svanberg, S., 1992a, Z. Phys. D, 23, 29 CrossRef
Bengtsson, G.J.,Berzinsh, U.,Larsson, J.,Svanberg, S., & Zerne, R., 1992b, J. Phys. II (France), 2, 773 CrossRef
Bevington, P.R., 1969, Data Reduction and Error Analysis for the Physical Sciences (McGraw-Hill: New York)
Blackwell, D.E., 1990, in Atomic Spectra and Oscillator Strengths for Astrophysics and Fusion Research (ASOS3 proceedings), ed. J.E. Hansen (North-Holland: Amsterdam), 160
Blackwell, D.E., & Collins, B.S., 1972, MNRAS, 157, 255 CrossRef
Bord, D.J.,Barisciano, L.P., & Cowley, C.R., 1996, MNRAS, 278, 997 CrossRef
Cardelli, J.A., & Savage, B.D., 1995, ApJ, 452, 275 CrossRef
Corliss, C.H., & Bozman, W.E., 1962, Experimental Transition Probabilities for Spectral Lines of Seventy Elements, NBS monograph 53
Cowan, R.D., 1981, The Theory of Atomic Structure and Spectra, (Univ. of California Press: Berkeley)
Cowley, C.R., 1983, MNRAS, 202, 417 CrossRef
Cowley, C.R., & Corliss, C.H., 1983, MNRAS, 203, 651 CrossRef
Cowley, C.R., & Warner, B., 1967, The Observatory, 87, 117
Curtis, L.J., 1974, JOSA, 64, 495 CrossRef
Curtis, L.J.,Deck, R.T., & Ellis, D.G., 1997, Phys. Lett. A, 230, 330 CrossRef
Ditchburn, R.W., 1963, Light, 2nd edition, Blackie & Son Limited (London: UK)
Dynefors, B.I., 1975, Phys. Scr., 11, 375 CrossRef
Froese Fischer, C., 2009, Phys. Scr., T134, 014019 CrossRef
Froese Fischer, C., & Smentek-Mielczarek, L., 1983, J. Phys. B, 16, 3479 CrossRef
Fivet, V., et al., 2008, J. Phys. B, 41, 015702 CrossRef
Garpman, S.,Holmgren, L., & Rosen, A., 1974, Phys. Scripta, 10, 221 CrossRef
Garstang, R.H., 1968, Atomic Transition Probabilities, in Beam-Foil Spectroscopy, Vol. II, ed. S. Bashkin (Gordon & Breach Science Publishers: New York)
Gruzdev, P.F., 1969, Opt. Spectr., 27, 479
Hanle, W., 1991, Z. Phys. D, 18, 3 CrossRef
Huber, M.C.E., & Sandeman, R.T., 1986, Rep. Prog. Phys., 49, 397 CrossRef
IUPAC, International Union of Pure and Applied Chemistry 1998, Isotopic Compositions of the Elements, 1989 in Pure and Applied Chemistry, 70, 217
Johansson, S.,Kalus, G.,Brage, T.,Leckrone, D.S., & Wahlgren, G.M., 1996, ApJ, 462, 943 CrossRef
Kay, L., 1963, Phys. Lett., 5, 36 CrossRef
Knox, R.S., & Olechna, D.J., 1967, J. Chem. Phys., 47, 5226 CrossRef
Krempl, H., & Schmid, G., 1968, Spectrochimica Acta, 23B, 819 CrossRef
Kupka, F.,Piskunov, N.,Ryabchikova, T.A.,Stempels, H.C., & Weiss, W.W., 1999, A&AS, 138, 119
Kurucz, R., 1993, CD-ROM18, cfa-www.harvard.edu/amp/ampdata/Kurucz218/sekur.html
Ladenburg, R., 1921, Z. Physik, 4, 451 CrossRef
Ladenburg, R., 1928, Z. Physik, 48, 15 CrossRef
Ladenburg, R., 1933, Rev. Mod. Phys., 5, 243 CrossRef
Laurence, G.M., 1967, ApJ, 148, 261 CrossRef
Li, Z.S.,Lundberg, H.,Sikström, C.M., & Johansson, S., 1999, Eur. Phys. J., D6, 9
Mannervik, S., 2003, Phys. Scr., T105, 67 CrossRef
Martinson, I., 1998, Proceedings of the International School of Physics “Enrico Fermi”, Course CXXXVII, ed. I. Bigi, & L. Moroni (IOS Press: Amsterdam), 625
Meggers, W.F., Corliss, C.H., & Scribner, B.F., 1975, NBS Monograph 145 (US Govt Printing Office: Washington DC)
Meléndez, J., & Barbuy, B., 1999, ApJ, 124, 527
Mihalas, D., 1978, Stellar Atmospheres, 2nd edition (W.H. Freeman and Company: San Francisco)
Morton, D., 2000, ApJS, 130, 403 CrossRef
Parkinson, W.H., 1971, in Shock Tube Research, Proceedings of the Eighth International Shock Tube Symposium, ed. J.L. Stollery, A.G. Gaydon, A. & P.R. Owen (Chapman and Hall: London)
Parkinson, W.H., 1987, in Spectroscopy of Astrophysical Plasmas, ed. A. Dalgarno, & D. Layzer (Cambridge Univ. Press: Cambridge)
Sikström, C.M.,Litzén, U.,Blom, A., & Lundberg, H., 2002, JQRST, 74, 355
Thévenin, F., 1990, A&AS, 82, 179
Thorne, A., Litzén, U., & Johansson, S., 1999, Spectrophysics (Springer-Verlag: Berlin)
Ubelis, A., & Berzinsh, U., 1986, Phys. Scr., 34, 805 CrossRef
Wahlgren, G.M., Brage, T., Brandt, J.C. et al., 2001, ApJ, 551, 520 CrossRef
Wahlgren, G.M., 2005, Mem. Soc. Astron. Italia Suppl., 8, 108
Wiese, W.L., & Martin, G.A., 1980, Wavelengths and Transition Probabilities for Atoms and Atomic Ions, Part II. Transition Probabilities, NSRDS–NBS68 (US Govt Printing Office: Washington DC)
Zwaan, C., 1967, Bull. Astr. Inst. Netherlands, 19, 1