Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Filming non-radiative population transfer: Time-resolved x-ray
  scattering near an avoided crossing   We show that time-resolved x-ray scattering from molecules prepared in a
superposition of electronic states moving through an avoided crossing has new
features not found in diffraction from the corresponding classical mixed state.
Photoabsorption in molecular iodine at 520 nm produces a superposition of two
dipole-allowed nearly degenerate electronic states, which interact due to
non-adiabatic coupling. We show experimental evidence that the mixing of the
nuclear wavepackets from the two electronic states at the avoided crossing
leads to ultrafast changes in the angular composition of the scattering
pattern. This provides a novel means to study transitions in excited molecular
systems. We reconstruct a movie of the nuclear probability density arising from
this interference.

25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin