Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoelectron holographic interferometry to probe the longitudinal
  momentum offset at the tunnel exit   Laser-induced electron tunneling underlies numerous emerging spectroscopic
techniques to probe attosecond electron dynamics in atoms and molecules. The
improvement of those techniques requires an accurate knowledge of the exit
momentum for the tunneling wave packet. Here we demonstrate a photoelectron
interferometric scheme to probe the electron momentum longitudinal to the
tunnel direction at the tunnel exit by measuring the photoelectron holographic
pattern in an orthogonally polarized two-color laser pulse. In this scheme, we
use a perturbative 400-nm laser field to modulate the photoelectron holographic
fringes generated by a strong 800-nm pulse. The fringe shift offers a direct
experimental access to the intermediate canonical momentum of the rescattering
electron, allowing us to reconstruct the momentum offset at the tunnel exit
with high accuracy. Our result unambiguously proves the existence of nonzero
initial longitudinal momentum at the tunnel exit and provides fundamental
insights into the non-quasi-static nature of the strong-field tunneling.

26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs