Accession Number : AD0698784

Title :   THE SPECTRA OF DOUBLY AND TRIPLY IONIZED RARE EARTHS.

Descriptive Note : Final rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF PHYSICS

Personal Author(s) : Crosswhite,H. M. ; Judd,B. R.

Report Date : 30 SEP 1969

Pagination or Media Count : 6

Abstract : The parametric description of energy levels of rare earth ions was extended to include operators not previously taken into account. For f(N)-shell configurations these include the magnetic corrections (spin-other-orbit and spin-spin) derived from the relativistic Breit operator, as well as new effective operators describing configuration-mixing shifts induced by a mixture of electrostatic and spin-orbit perturbations. In the wavelength region 1200-3000A the experimental spectra were measured and partially analyzed for Pr(IV), Nd(III) and (IV), Sm(III), Gd(IV), Dy(IV), Er(III) and (IV), and Tm(III) and (IV). An extensive computer tape library was prepared which includes all f(N) and f(N)d configurations of immediate interest. With these and the present knowledge of atomic structure parameters, it is now possible to anticipate the energy level structure of these configurations to better than 100/cm. The calculations also include relative transition probabilities in intermediate coupling and hence give a very good estimate of the location of the stronger lines. A very brief summary is given of these activities. (Author)

Descriptors :   (*RARE EARTH COMPOUNDS, *ULTRAVIOLET SPECTRA), MOLECULAR ORBITALS, MOLECULAR ENERGY LEVELS, CRYSTAL DEFECTS, DOPING, (U)DOPING

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE