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Journal of Physics: Conference Series
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H2 photoionization induced by XUV pulses and X-ray free electron lasers
To cite this article: A Sopena et al 2020 J. Phys.: Conf. Ser. 1412 072042
 
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Journal of Physics: Conference Series 1412 (2020) 072042
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doi:10.1088/1742-6596/1412/7/072042
1
H2 photoionization induced by XUV pulses
and X-ray free electron lasers
A Sopena1,2 ∗, A Palacios2, F Mart́ın2,3, F Catoire1 and H Bachau1
1Centre des Lasers Intenses et Applications, Talence, 33405, France
2Universidad Autónoma de Madrid, Madrid, 28049, Spain
3Instituto Madrileño de Estudios Avanzados (IMDEA) en Nanociencia, Madrid, 28049, Spain
Synopsis We present a theoretical study on H2 photionization taking into account coupled electron-nuclear
motion and non-dipole effects. In the first part we study the effects of harmonic filtering in a pump-probe scheme
using attosecond train pulses (ATP) in dipole approximation. In the second part we investigate nondipole effects
in XUV and soft X-ray regimes.
The development of intense XUV sources
through free electron lasers (FEL) and high-order
harmonic generation (HHG) in the femtosecond
(fs) and sub fs domains provides a unique tool
to investigate non-linear laser matter interac-
tion at ultra short time durations. Attosec-
ond pulses provide the possibility for coherently
and simultaneously control both electronic and
nuclear dynamics, specifically populating differ-
ent vibronic (electronic+vibrational) states [1],
this makes mandatory the use of theoretical ap-
proaches beyond the Born-Oppenheimer approx-
imation to be understood. On the other hand
it is well-known that, in the XUV and soft X-
rays domains, the dipole approximation must be
carefully used. In particular, nondipole effects in
atom and molecules result in asymmetries of the
photoelectron distributions (see [2] for the cases
of He or H2, and references therein).
In this work, we present ab initio calculations
performed on H2 [3] to investigate the possibil-
ity of control excitation and ionization yields in
two different cases. In the first case we inves-
tigated the effect of filtering different harmon-
ics in a pump-probe scheme using VUV ATP.
The higher state selectivity of ATP compared
to single broad-bandwidth attosecond pulses to-
gether with the capabilities of IR sources to trace
and drive the coupled electron and nuclear mo-
tion initiated by a VUV ATP makes this tech-
nique perfect to control excitation and ionization
yields on attosecond timescales by means of elec-
tron wave packets interference [1]. For the sec-
ond case we follow our recent research on stimu-
lated Compton scattering in hydrogen [4] where
we have shown that the diamagnetic term A2
(where A the vector potential of the field), usu-
ally neglected in dipole approximation, plays a
crucial role in this context. These studies are
now extended to the molecule H2, results will be
presented and discussed at the conference.
Figure 1. Schematics of the pump-probe simula-
tion. Upper panels represent the temporal profile
of the pump and probe laser fields. Lower panels
represent the spectrum of said pulses superimposed
to the energy diagram of H2. Right figures corre-
spond to the filtered case and left figures correspond
to the unfiltered case.
References
[1] Ranitovic P et al 2014 PNAS 111 912
[2] Zimmermann B et al 2015 Phys. Rev. A 91
053410
[3] Palacios A et al 2015 J. Phys. B 48 242001
[4] Bachau H et al 2014 Phys. Rev. Lett. 112 073001
∗E-mail: arturo.sopena@u-bordeaux.fr


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