Electron correlation in channel-resolved strong-field molecular double ionization

Cheng, Chuan; Vindel-Zandbergen, Patricia; Matsika, Spiridoula; Weinacht, Thomas

doi:10.1103/physreva.100.053405

Cited by 14 publications

(11 citation statements)

References 88 publications

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“…As the intensity increases, higher order ionization becomes more prominent. 42,45–49 Thus it makes sense that the O + /CD 2 + /CD 2 O 2+ signal for low intensities is dominated by fragments arising from dissociative single ionization, with Kinetic Energy Release (KER) between 0 and 1.3 eV, while the O + /CD 2 + /CD 2 O 2+ signal for high intensities is dominated by the dication formed by double ionization, with KER between 1 and 5 eV.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental setup has been described in detail in previous work. 41,42 Briefly, the output from a commercial amplified Ti:sapphire laser system (KM Labs, 1 mJ, 780 nm, 1 kHz, 30 fs) is sent into the vacuum chamber and is focused by a concave spherical silver mirror (f = 5 cm) to peak intensities between 40 and 240 TW cm -2 inside a Velocity Map Imaging (VMI) spectrometer. The VMI has a switchable three plate electrostatic lens stack, Microchannel Plates (MCP), phosphor screen, and camera (Tpx3Cam).…”

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Stable excited dication: trapping on the S₁ state of formaldehyde dication after strong field ionization

Singh

Cheng

Weinacht

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Stable excited dication: trapping on the S₁ state of formaldehyde dication after strong field ionization

Singh

Cheng

Weinacht

et al. 2022

Phys. Chem. Chem. Phys.

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“…If this evolution occurs in the states of the monocation, the double-ionization process must be sequential. The presence of sequential double ionization is supported by an angular correlation analysis of the two electrons produced in coincidence with the dissociating ions, which shows almost no correlation between the electron momenta, in contradiction to results from non-sequential ionization [31,38]. Specifically, the correlation between the x-component of momentum in the lab-frame of each of the two electrons produced in coincidence with D + /OD + was examined.…”

Section: A Two-body Fragment Momentum Distributionsmentioning

confidence: 95%

“…The short pulse experiment uses a 780-nm 30-fs 1-kHz Ti:Sapphire system [30,31]. Output pulses from this laser were spectrally broadened in an argon gas filament and recompressed to approximately 10 fs (FWHM) using chirped mirrors and an acousto-optic pulse shaper [32].…”

Section: Experimental Methodsmentioning

confidence: 99%

Strong Field Ionization of Water: Nuclear Dynamics Revealed by Varying the Pulse Duration

Howard,

Cheng,

Forbes

et al. 2021

Preprint

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Polyatomic molecules in strong laser fields can undergo substantial nuclear motion within tens of femtoseconds. Ion imaging methods based on dissociation or Coulomb explosion therefore have difficulty faithfully recording the geometry dependence of the field ionization that initiates the dissociation process. Here we compare the strong-field double ionization and subsequent dissociation of water (both H2O and D2O) in 10-fs and 40-fs 800-nm laser pulses. We find that 10-fs pulses turn off before substantial internuclear motion occurs, whereas rapid internuclear motion can take place during the double ionization process for 40-fs pulses. The short-pulse measurements are consistent with a simple tunnel ionization picture, whose predictions help interpret the motion observed in the long-pulse measurements.

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“…Two similar apparatuses were used to carry out the measurements. Since they are almost the same, we provide a description for the apparatus used to carry out the 10 fs pulse measurements (described in detail in previous work [41,42]) and indicate any differences for the apparatus used for the 40 fs pulse measurements. Briefly, the output from a commercial amplified Ti:sapphire laser system (1 mJ, 780 nm, 1 kHz) is spectrally broadened using filamentation in Ar gas, and compressed to ∼10 fs using chirped mirrors and an acousto-optic pulse shaper [43].…”

Section: Methodsmentioning

confidence: 99%

Strong Field Ionization of Water II: Electronic and Nuclear Dynamics En Route to Double Ionization

Cheng,

Streeter,

Howard

et al. 2021

Preprint

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We investigate the role of nuclear motion and strong-field-induced electronic couplings during the double ionization of deuterated water using momentum-resolved coincidence spectroscopy. By examining the three-body dicationic dissociation channel, D + /D + /O, for both few-and multi-cycle laser pulses, strong evidence for intra-pulse dynamics is observed. The extracted angle-and energyresolved double ionization yields are compared to classical trajectory simulations of the dissociation dynamics occurring from different electronic states of the dication. In contrast with measurements of single photon double ionization, pronounced departure from the expectations for vertical ionization is observed, even for pulses as short as 10 fs in duration. We outline numerous mechanisms by which the strong laser field can modify the nuclear wavefunction en-route to final states of the dication where molecular fragmentation occurs. Specifically, we consider the possibility of a coordinatedependence to the strong-field ionization rate, intermediate nuclear motion in monocation states prior to double ionization, and near-resonant laser-induced dipole couplings in the ion. These results highlight the fact that, for small and light molecules such as D2O, a vertical-transition treatment of the ionization dynamics is not sufficient to reproduce the features seen experimentally in the coincidence double-ionization data.

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Electron correlation in channel-resolved strong-field molecular double ionization

Cited by 14 publications

References 88 publications

Stable excited dication: trapping on the S₁ state of formaldehyde dication after strong field ionization

Stable excited dication: trapping on the S₁ state of formaldehyde dication after strong field ionization

Strong Field Ionization of Water: Nuclear Dynamics Revealed by Varying the Pulse Duration

Strong Field Ionization of Water II: Electronic and Nuclear Dynamics En Route to Double Ionization

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Electron correlation in channel-resolved strong-field molecular double ionization

Cited by 14 publications

References 88 publications

Stable excited dication: trapping on the S1 state of formaldehyde dication after strong field ionization

Stable excited dication: trapping on the S1 state of formaldehyde dication after strong field ionization

Strong Field Ionization of Water: Nuclear Dynamics Revealed by Varying the Pulse Duration

Strong Field Ionization of Water II: Electronic and Nuclear Dynamics En Route to Double Ionization

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Product

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Stable excited dication: trapping on the S₁ state of formaldehyde dication after strong field ionization

Stable excited dication: trapping on the S₁ state of formaldehyde dication after strong field ionization