Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular Dynamics at Electrical- and Optical-Driven Phase Transitions
  Time-Resolved Infrared Studies Using Fourier-Transform Spectrometers   The time-dependent optical properties of molecular systems are investigated
by step-scan Fourier-transform spectroscopy in order to explore the dynamics at
phase transitions and molecular orientation in the milli- and microsecond
range. The electrical switching of liquid crystals traced by vibrational
spectroscopy reveals a rotation of the molecules with a relaxation time of 2
ms. The photo-induced neutral-ionic transition in TTF-CA takes place by a
suppression of the dimerization in the ionic phase and creation of neutral
domains. The time-dependent infrared spectra depend on temperature and laser
pulse intensity; the relaxation of the spectra follows a stretched-exponential
decay with relaxation times in the microsecond range strongly dependent on
temperature and laser intensity. We present all details of the experimental
setups and thoroughly discuss the technical challenges.

11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph