Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The influence of the stationary electric field upon the resonance
  absorption of microwaves in HeII   The interaction between electromagnetic microwaves (40-200 GHz) and
superfluid helium in a stationary electric field has been investigated
experimentally. It is found that the narrow line of resonance absorption at the
roton frequency is split in the electric field into two symmetric lines. The
splitting magnitude increases almost linearly with the electric field, which
suggests a linear Stark effect. The results obtained point of orientational
polarizability and dipole moment (10^(-34)C*m) in HeII. It is shown that the
spectral line profile consists of two parts - a narrow line of resonance
absorption (or induced radiation when superfluid stream are generated) and a
broad background. The background with agrees well with the latest neutron data
for the roton line.

16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex