Wavelength dependence of sub-laser-cycle few-electron dynamics in strong-field multiple ionization

Herrwerth, Oliver; Rudenko, Artem; Kremer, M.; Jesus, V. L. B. de; Fischer, Bettina; Gademann, G.; Simeonidis, Konstantinos; Achtelik, A; Ergler, Th.; Feuerstein, B.; Schröter, C. D.; Moshammer, R.; Ullrich, J.

doi:10.1088/1367-2630/10/2/025007

Cited by 45 publications

(45 citation statements)

References 53 publications

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“…In order to provide clear evidence for the recollision model and a separation of the two possible channels, numerous differential measurements of the recoil ion momentum in NSDI were performed [67][68][69][70][71]. Using a reaction microscope like in Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS, for a review see for example the article by Dörner et al [72], a simplified setup is illustrated in figure 2.5), the recoil momentum vectors of the doubly ionised ion and the two ejected electrons are determined via their position on the detector and time-of-flight (TOF).…”

Section: Nonsequential Double Ionisationmentioning

confidence: 99%

“…Using a reaction microscope like in Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS, for a review see for example the article by Dörner et al [72], a simplified setup is illustrated in figure 2.5), the recoil momentum vectors of the doubly ionised ion and the two ejected electrons are determined via their position on the detector and time-of-flight (TOF). A kinematic analysis of these vectors is based on momentum conservation during recollision (neglecting photon momenta) and the fact that the two electrons are detected as directed electrons, Figure 2.5: Schematic sketch of the reaction microscope typically used for differential recoil ion measurements (taken from [67]). The sample is delivered in form of a rotationally cold supersonic gasjet, perpendicular to the laser propagation direction.…”

Section: Nonsequential Double Ionisationmentioning

confidence: 99%

“…The arrows point at the maximum drift momenta. Ion momentum spectra from Ar and Ne at 800 nm (circles) and 1300 nm (solid line) [67]. The experiment was performed using 30 fs at 800 nm and 35-40 fs at 1300 nm pulses with the intensity denoted in PWcm −2 in the figure.…”

Section: Nonsequential Double Ionisationmentioning

confidence: 99%

“…The dependence on the atomic structure can be illustrated by comparing a light atom like Ne to a heavier one like Ar (see for example [67,74,75]). For comparable intensities, the RESI channel is much more significant in Ar than in Ne, as shown in figure 2.7.…”

Section: Atomic Structurementioning

confidence: 99%

“…The wavelength dependence is qualitatively similar to intensity, but quantitatively stronger due to its quadratic scaling in U p . Several studies [67,75] show that the impact ionisation channel becomes increasingly dominant for higher wavelengths. This is due to an increase in recollision energy and decrease in the Keldysh parameter and hence going deeper into the tunneling regime.…”

Section: Laser Pulse Parametersmentioning

confidence: 99%

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Resolving Strong Field Dynamics in Cation States of CO_2 via Optimised Molecular Alignment

Oppermann

2014

Springer Theses

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In this thesis, the role of the molecular structure in strong field induced processes in CO 2 is resolved by the use of optimised impulsive molecular alignment. Two processes were investigated: recollision induced ionisation and the dissociation of the molecular ion CO + 2 . Both processes are driven by the initial tunneling ionisation of CO 2 . Through the use of molecular alignment, the orbital symmetries of the involved molecular ionic states were resolved, revealing the internal molecular dynamics in the form of ionisation and excitation pathways.A novel data analysis procedure was developed to extract the alignment distribution and rotational temperature of the impulsively aligned molecular ensemble. This facilitated the optimisation of molecular alignment in mixed gas samples and was demonstrated for N 2 , O 2 and CO 2 seeded in Ar.The recollision induced or nonsequential double ionisation (NSDI) of CO 2 was then studied in the molecular frame. The process was fully characterised by measuring the shape of the recolliding electron wavepacket and the angularly resolved inelastic electronion recollision cross section. The results reveal the contribution from both the ionic ground and first excited state of CO + 2 to the NSDI mechanism. This study was extended to the strong field induced dissociation of impulsively aligned CO + 2 . It was found that dissociation is driven by a parallel dipole transition from the second excited ionic state B to the predissociating state C, whilst recollision excitation was shown to not play a role. The strong field induced coupling of the ionic states B and C could thus be controlled by the laser polarisation.The results obtained in this thesis further the understanding of population dynamics of cation states in strong field processes. This is of special interest for extending molecular strong field physics to the study of electronic degrees of freedom and their coupling to the nuclear motion. had hoped for in a research degree and I cannot thank Jon enough for making it such an enriching experience, both professionally and personally.

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