Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Rotatory Dispersion of $\alpha$-quartz   It is shown that some formulae describing optical rotatory dispersion of
$\alpha$-quartz with the aid of two Drude's terms reduce to the combined
formula containing one Drude's and one Chandrasekhar's term. Comparison of
various formulae describing the experimental data of $\alpha$-quartz leads to
the conclusion that the optical activity of this crystal is due to its crystal
structure only, that means the optical activity is not of molecular origin.
Further the rotatory strengths are discussed with the regard to coupled
oscillator model and to the structure of $\alpha$-quartz.

16
The categories of this paper are: stat
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th