Angular dependence of the Wigner time delay upon tunnel ionization of H2

AbstractWhen a very strong light field is applied to a molecule an electron can be ejected by tunneling. In order to quantify the time-resolved dynamics of this ionization process, the concept of the Wigner time delay can be used. The properties of this process can depend on the tunneling direction relative to the molecular axis. Here, we show experimental and theoretical data on the Wigner time delay for tunnel ionization of H2 molecules and demonstrate its dependence on the emission direction of the electron with respect to the molecular axis. We find, that the observed changes in the Wigner time delay can be quantitatively explained by elongated/shortened travel paths of the emitted electrons, which occur due to spatial shifts of the electrons’ birth positions after tunneling. Our work provides therefore an intuitive perspective towards the Wigner time delay in strong-field ionization.

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Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane

Physical Chemistry Chemical Physics ◽

10.1039/c8cp07032f ◽

2019 ◽

Vol 21 (26) ◽

pp. 14090-14102 ◽

Cited By ~ 3

Author(s):

Y. Malakar ◽

W. L. Pearson ◽

M. Zohrabi ◽

B. Kaderiya ◽

Kanaka Raju P. ◽

...

Keyword(s):

Wave Packet ◽

Strong Field ◽

Wave Packets ◽

Field Ionization ◽

Time Resolved ◽

Strong Field Ionization ◽

Wave Packet Dynamics ◽

Imaging Experiment ◽

Momentum Imaging ◽

Time Resolved Imaging

We report the results of a time-resolved coincident ion momentum imaging experiment probing nuclear wave packet dynamics in the strong-field ionization and dissociation of iodomethane (CH3I).

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Angle-dependent strong-field ionization of triple bonded systems calculated by time-dependent configuration interaction with an absorbing potential

Canadian Journal of Chemistry ◽

10.1139/cjc-2016-0185 ◽

2016 ◽

Vol 94 (12) ◽

pp. 989-997 ◽

Cited By ~ 6

Author(s):

Qing Liao ◽

Wen Li ◽

H. Bernhard Schlegel

Keyword(s):

Angular Dependence ◽

Configuration Interaction ◽

Strong Field ◽

Population Analysis ◽

Three Dimensional ◽

Time Dependent ◽

Molecular Axis ◽

Field Ionization ◽

Ionization Yield ◽

Strong Field Ionization

The angle dependence of strong field ionization has been studied for a set of molecules containing triple bonds: HCCH, HCN, HCC–CN, H2N–CCH, H2N–CN, and H2N–CC–CN. Time-dependent configuration interaction (TDCI) with a complex absorbing potential was used to model strong field ionization by a linearly polarized seven-cycle 800 nm cosine squared pulse. The ionization yields have been calculated as a function of the laser intensity and polarization direction and plotted as three-dimensional surfaces. At low field strengths, the angular dependence can be understood in terms of ionization from the highest occupied orbitals. At higher laser intensities, ionization occurs from lower lying orbitals as well as from the highest occupied orbitals, as indicated by changes in the angular dependence of the ionization yield and by variations in the population analysis of the TDCI wavefunction with the intensity of the laser field. The ionization yield for directions parallel to the molecular axis increases more rapidly than perpendicular to the axis as the conjugation length is increased. NH2 substitution substantially increases the ionization yield along the molecular axis but has only a small effect for perpendicular directions.

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Strong-field-ionization suppression by light-field control

Physical Review A ◽

10.1103/physreva.86.033426 ◽

2012 ◽

Vol 86 (3) ◽

Cited By ~ 22

Author(s):

Esa Räsänen ◽

Lars Bojer Madsen

Keyword(s):

Light Field ◽

Strong Field ◽

Field Ionization ◽

Strong Field Ionization ◽

Field Control ◽

Ionization Suppression

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Multi-channel photodissociation and XUV-induced charge transfer dynamics in strong-field-ionized methyl iodide studied with time-resolved recoil-frame covariance imaging

Faraday Discussions ◽

10.1039/d0fd00115e ◽

2020 ◽

Author(s):

Felix Allum ◽

Nils Anders ◽

Mark Brouard ◽

Phil H. Bucksbaum ◽

Michael Burt ◽

...

Keyword(s):

Charge Transfer ◽

Methyl Iodide ◽

Free Electron Laser ◽

Extreme Ultraviolet ◽

Strong Field ◽

Field Ionization ◽

Time Resolved ◽

Strong Field Ionization ◽

Induced Charge ◽

Charge Transfer Dynamics

The photodissociation dynamics of strong-field ionized methyl iodide (\ce{CH3I}) were probed using intense extreme ultraviolet (XUV) radiation produced by the SPring-8 Angstrom Compact free electron LAser (SACLA). Strong-field ionization and...

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