Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-resolved four-wave-mixing spectroscopy for inner-valence
  transitions   Non-collinear four-wave mixing (FWM) techniques at near-infrared (NIR),
visible, and ultraviolet frequencies have been widely used to map vibrational
and electronic couplings, typically in complex molecules. However, correlations
between spatially localized inner-valence transitions among different sites of
a molecule in the extreme ultraviolet (XUV) spectral range have not been
observed yet. As an experimental step towards this goal we perform
time-resolved FWM spectroscopy with femtosecond NIR and attosecond XUV pulses.
The first two pulses (XUV-NIR) coincide in time and act as coherent excitation
fields, while the third pulse (NIR) acts as a probe. As a first application we
show how coupling dynamics between odd- and even-parity inner-valence excited
states of neon can be revealed using a two-dimensional spectral representation.
Experimentally obtained results are found to be in good agreement with ab
initio time-dependent R-matrix calculations providing the full description of
multi-electron interactions, as well as few-level model simulations. Future
applications of this method also include site-specific probing of electronic
processes in molecules.

24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio