Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrapulse Impact Processes in Dense-Gas Femtosecond Laser Filamentation   The processes of energy gain and redistribution in a dense gas subject to an
intense ultrashort laser pulse are investigated theoretically for the case of
high-pressure argon. The electrons released via strong-field ionization and
driven by oscillating laser field collide with neutral neighbor atoms, thus
effecting the energy gain in the emerging electron gas via a short-range
inverse Bremsstrahlung interaction. These collisions also cause excitation and
impact ionization of the atoms thus reducing the electron-gas energy. A kinetic
model of these competing processes is developed which predicts the prevalence
of excited atoms over ionized atoms by the end of the laser pulse. The creation
of a significant number of excited atoms during the pulse in high-pressure
gases is consistent with the delayed ionization dynamics in the pulse wake,
recently discovered by Gao et al.[1] This energy redistribution mechanism
offers an approach to manage effectively the excitation vs. ionization patterns
in dense gases interacting with intense laser pulses and thus opens new avenues
for diagnostics and control in these settings.

13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th