Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interband scattering in MgB2   The scattering process responsible for connecting the bands remains one of
the last open questions on the physical properties of MgB2. Through the
analysis of the equilibrium and photo-induced far-infrared properties as well
as electron spin resonance of MgB2 we propose a phonon mediated energy transfer
process between the bands based on the coupling of quasiparticles to an E2g
phonon.

19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci