Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A method for assigning satellite lines to crystallographic sites in rare
  earth crystals   We describe an experimental technique for associating the satellite lines in
a rare earth optical spectrum caused by a defect with the rare earth ions in
crystal sites around that defect. This method involves measuring the hyperfine
splitting caused by a magnetic dipole-dipole interaction between host ions and
a magnetic defect. The method was applied to Ce3+:EuCl3.6H2O to assign 13 of
the outermost 22 satellite lines to sites. The assignments show that the
optical shift of a satellite line is loosely dependent on the distance to the
dopant. The interaction between host and dopant ions is purely dipole-dipole at
distances greater than 7 Angstroms, with an additional contribution, likely
superexchange, at distances less than 7 Angstroms.

16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org