Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantitative disentanglement of coherent and incoherent laser-induced
  surface deformations by time-resolved x-ray reflectivity   We present time-resolved x-ray reflectivity measurements on laser excited
coherent and incoherent surface deformations of thin metallic films. Based on a
kinematical diffraction model, we derive the surface amplitude from the
diffracted x-ray intensity and resolve transient surface excursions with
sub-Angstrom spatial precision and 70 ps temporal resolution. The novel
analysis allows for decomposition of the surface amplitude into multiple
coherent acoustic modes and a substantial contribution from incoherent phonons
which constitute the sample heating.

16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ