Combining attosecond XUV pulses with coincidence spectroscopy

Sabbar, Mazyar; Heuser, Sebastian; Boge, Robert; Lucchini, Matteo; Gallmann, L.; Cirelli, Claudio; Keller, U.

doi:10.1063/1.4898017

Cited by 73 publications

(54 citation statements)

References 30 publications

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“…The experimental setup has been presented elsewhere [32]. In brief, we use a Ti:sapphire laser system providing IR pulses with a duration of 30 fs and pulse energies up to 750 μJ at a repetition rate of 10 kHz.…”

Section: Methodsmentioning

confidence: 99%

“…Full angular resolution is obtained with the recently developed "AttoCOLTRIMS" apparatus [32], which consists of a reaction microscope allowing for full three-dimensional (3D) momentum detection [33], combined with an attosecond front end providing XUV attosecond pulses. Using the RABBITT technique, we measure a significant angular dependence of the photoionization time delay, which can be as large as 60 as.…”

Section: Introductionmentioning

confidence: 99%

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Angular dependence of photoemission time delay in helium

et al. 2016

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Time delays of electrons emitted from an isotropic initial state with the absorption of a single photon and leaving behind an isotropic ion are angle independent. Using an interferometric method involving XUV attosecond pulse trains and an IR-probe field in combination with a detection scheme, which allows for full three-dimensional momentum resolution, we show that measured time delays between electrons liberated from the 1s 2 spherically symmetric ground state of helium depend on the emission direction of the electrons relative to the common linear polarization axis of the ionizing XUV light and the IR-probing field. Such time delay anisotropy, for which we measure values as large as 60 as, is caused by the interplay between final quantum states with different symmetry and arises naturally whenever the photoionization process involves the exchange of more than one photon. With the support of accurate theoretical models, the angular dependence of the time delay is attributed to small phase differences that are induced in the laser-driven continuum transitions to the final states. Since most measurement techniques tracing attosecond electron dynamics involve the exchange of at least two photons, this is a general and significant effect that must be taken into account in all measurements of time delays involving photoionization processes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Angular dependence of photoemission time delay in helium

et al. 2016

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“…COLTRIMS has been successfully combined with an attosecond beamline (attoCOLTRIMS) and streaking measurements performed in coincidence have allowed the delays in photoemission from Ar and Ne atoms to be retrieved. 183 …”

Section: Attosecond Spectroscopy Techniquesmentioning

confidence: 99%

Attosecond Electron Dynamics in Molecules

et al. 2017

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Advances in attosecond science have led to a wealth of important discoveries in atomic, molecular, and solid-state physics and are progressively directing their footsteps toward problems of chemical interest. Relevant technical achievements in the generation and application of extreme-ultraviolet subfemtosecond pulses, the introduction of experimental techniques able to follow in time the electron dynamics in quantum systems, and the development of sophisticated theoretical methods for the interpretation of the outcomes of such experiments have raised a continuous growing interest in attosecond phenomena, as demonstrated by the vast literature on the subject. In this review, after introducing the physical mechanisms at the basis of attosecond pulse generation and attosecond technology and describing the theoretical tools that complement experimental research in this field, we will concentrate on the application of attosecond methods to the investigation of ultrafast processes in molecules, with emphasis in molecules of chemical and biological interest. The measurement and control of electronic motion in complex molecular structures is a formidable challenge, for both theory and experiment, but will indubitably have a tremendous impact on chemistry in the years to come.

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“…The detection of all products of the reaction in coincidence in order to identify unequivocally the reaction channel is a very complicated task. Up to date, only (e,2e), (e,3e) [8] and COLTRIMS [9] experiments are possible, where two or three emerging electrons can be collected after the collision. Therefore, the photoionization data can be helpful to investigate the multiple ionization channels by electron impact.…”

Section: Introductionmentioning

confidence: 99%