Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-electron quantum dynamics in high-harmonic generation spectrum
  from LiH molecule: analysis of potential energy surfaces for electrons
  constructed from a model of localized Gaussian wave packets with valence-bond
  spin-coupling   High-harmonic generation (HHG) spectrum from a LiH molecule induced by an
intense laser pulse is computed and analyzed with potential energy surfaces for
electron motion (ePES) constructed from a model of localized electron wave
packets (EWP) with valence-bond spin-coupling. The molecule has two valence
ePES with binding energies of 0.39 hartree and 1.1 hartree. The HHG spectrum
from an electron dynamics on the weaker bound valence ePES, virtually assigned
to Li 2s, exhibits a dominant peak at the first harmonic without plateau and
cut-off. This compares with the free electron spectrum under oscillating laser
field and is comprehensive with the shape and depth of the ePES. The other
valence ePES, assingned to H 1s, is deeper bound such that the overall profile
of the wave function is well approximated by a Gaussian of the width comparable
to the Li-H bond length. However, a small fraction, less than $10^{-3}$, of the
probability density amplitude tunnels out from the bound potential with high
wave number, and spreads over tens of nm's with parts recombining to the
molecule due to the laser field oscillation. This minor portion of the
electronic wave function is the major origin of the HHG extending up to 50
harmonic orders. Nonlinear dynamics within the potential well induced by the
laser field oscillation also contributes to the HHG up to 30 harmonic orders.

18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph