Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collisionless absorption of short laser pulses in a deuterium cluster:
  dependence of redshift of resonance absorption peak on laser polarization,
  intensity and wavelength   We study collisionless absorption of short laser pulses of various intensity,
wavelength ($\lambda$) and polarization in a deuterium cluster using molecular
dynamics (MD) simulation. For a given laser energy and a pulse duration
$\approx$ 5-fs (fwhm), it is found that maximum laser absorption does not
happen at the welknown static Mie-resonance or linear resonance (LR) wavelength
of $\lambdaM\approx 263$~nm (for deuterium cluster) irrespective of linear
polarization (LP) and circular polarization (CP) state of laser. As the laser
intensity increases, the absorption peak is gradually red-shifted to a higher
$\lambda$ in the marginally over-dense regime of $\lambda\!\! \approx
\!\!(1\!\!-\!\!1.5)\lambdaM$ from the expected static~$\lambdaM$ owing to
gradual outer ionization and cluster expansion; and above an intensity the
resonance absorption peak disappears (sometimes followed by {\em even} a growth
of absorption) when outer ionization saturates at 100\% for both LP and CP.
This disappearance of the resonance absorption peak should not be
misinterpreted as the negligible (or no) role of Mie-resonance. In fact, in
this marginally over-dense band of $\lambda\!\! \approx
\!\!(1\!\!-\!\!1.5)\lambdaM$, some electrons undergo dynamic Mie-resonance
(dynamic LR) and others anharmonic resonance when they are freed. It is also
found that before the absorption peak, laser absorption due to LP and CP lasers
are almost equally efficient (CP case being inappreciably higher than LP) for
all intensities and $\lambda$. However, after the absorption peak, at lower
intensities, absorption due to LP inappreciably dominates absorption due to CP
with increasing~$\lambda$ which gradually reverses at higher intensities. MD
results are also supported by a naive rigid sphere model of cluster.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph