Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stark effect in the nonuniform field and its influence on the fine
  structure of Rydberg blockade   Splitting the energy levels of a hydrogen-like atom by the electric field
nonuniform at the atomic scale is studied. This situation is important for the
multi-level treatment of the phenomenon of Rydberg blockade [Yu.V. Dumin, J.
Phys. B, v.47, p.175502 (2014)]. An explicit formula for the energy levels is
derived. A typical value of the energy shift by the electric field gradient
turns out to be proportional to the 4th power of the principal quantum number
(i.e., the square of atomic size), as would be expected from a qualitative
consideration. Finally, the fine spatial structure of the Rydberg blockade is
analyzed when the electric-field-gradient term plays the dominant role, and the
results are confronted with the experimental data.

28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga