Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Averaged electron collision cross sections for thermal mixtures of
  $\alpha$-Alanine conformers in the gas phase   A theoretical study of elastic electron collisions with 9 conformers of the
gas-phase amino acid $\alpha$-alanine (CH$_3$CH(NH$_2$)COOH) is performed. The
eigenphase sums, resonance features, differential and integral cross sections
are computed for each individual conformer. Resonance positions for the
low-energy $\pi^*$ shape resonance are found to vary from 2.6 eV to 3.1 eV and
the resonance widths from 0.3 eV to 0.5 eV. Averaged cross sections for thermal
mixtures of the 9 conformers are presented. Both theoretical and experimental
population ratios are considered. Thermally-averaged cross sections obtained
using the best theoretical estimates give reasonable agreement with the
observed thermal cross sections. Excited conformers IIA and IIB make a large
contribution to this average due to their large permanent dipole moments.

0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math