Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular biaxiality determines the helical structure -- Infrared
  measurements of the molecular order in the NTB phase of difluoro terphenyl
  dimers   IR polarized spectroscopy was employed, to obtain the three components of IR
absorbance for a series DTC5Cn (n=5,7,9,11) of bent-shaped dimers containing
double fluorinated terphenyl core. Then, they were used to calculate both
uniaxial (S) and biaxial (D) order parameters, for various molecular groups of
dimers. The molecule bend was estimated due to observed difference between S
parameters for the terphenyl core and central hydrocarbon linker. It is found
to be significant in N phase despite almost no macroscopic director bend. The
temperature dependence of the order parameter, S, distinctly reverses its
monotonic trend of increase to decrease at the transition temperature, TN-NTB
to the NTB phase as result of the director tilt in the NTB phase. The biaxial
order parameter, D, is negligible in the N phase, and then starts increasing on
entering the NTB temperature, similarly to sin2q. The local director curvature
is found to be controlled by the molecular biaxiality parameter.

31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys