Attosecond Coherent Control of Single and Double Photoionization in Argon

Hogle, Craig W.; Tong, Xiao-Min; Martin, Leigh S.; Murnane, Margaret M.; Kapteyn, Henry C.; Ranitovic, Predrag

doi:10.1103/physrevlett.115.173004

Cited by 16 publications

(8 citation statements)

References 38 publications

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“…This spectrometer is based on a revised Coincidences entre ions et electrons localisés (CIEL) design [16], which is conceptually similar to reaction microscope or Cold Target Recoil Ion Momentum Spectroscopy [33,34]. Momentum imaging instruments of this type have been widely used for the study of photoionization dynamics [35,36] and can with the help of electric and magnetic fields, collect high-energy electrons over the full solid angle (i.e., 4π collection). The charged particles produced through ionization are accelerated with a weak electric extraction field.…”

Section: D Photoelectron/ion Spectrometermentioning

confidence: 99%

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

et al. 2020

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Attosecond pulses, produced through high-order harmonic generation in gases, have been successfully used for observing ultrafast, subfemtosecond electron dynamics in atoms, molecules and solid state systems. Today’s typical attosecond sources, however, are often impaired by their low repetition rate and the resulting insufficient statistics, especially when the number of detectable events per shot is limited. This is the case for experiments, where several reaction products must be detected in coincidence, and for surface science applications where space charge effects compromise spectral and spatial resolution. In this work, we present an attosecond light source operating at 200 kHz, which opens up the exploration of phenomena previously inaccessible to attosecond interferometric and spectroscopic techniques. Key to our approach is the combination of a high-repetition rate, few-cycle laser source, a specially designed gas target for efficient high harmonic generation, a passively and actively stabilized pump-probe interferometer and an advanced 3D photoelectron/ion momentum detector. While most experiments in the field of attosecond science so far have been performed with either single attosecond pulses or long trains of pulses, we explore the hitherto mostly overlooked intermediate regime with short trains consisting of only a few attosecond pulses. We also present the first coincidence measurement of single-photon double-ionization of helium with full angular resolution, using an attosecond source. This opens up for future studies of the dynamic evolution of strongly correlated electrons.

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Section: D Photoelectron/ion Spectrometermentioning

confidence: 99%

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

et al. 2020

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“…In this work, we study the photoionization of helium by tailored sequences of a few attosecond pulses in the presence of a weak IR laser field using three-dimensional (3D) momentum electron detection, which is becoming an essential tool in attosecond science (34,35). The principle of our experiment is illustrated in Fig.…”

Section: Significancementioning

confidence: 99%

Controlling photoionization using attosecond time-slit interferences

Cheng

Mikaelsson

Nandi

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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When small quantum systems, atoms or molecules, absorb a high-energy photon, electrons are emitted with a well-defined energy and a highly symmetric angular distribution, ruled by energy quantization and parity conservation. These rules are based on approximations and symmetries which may break down when atoms are exposed to ultrashort and intense optical pulses. This raises the question of their universality for the simplest case of the photoelectric effect. Here we investigate photoionization of helium by a sequence of attosecond pulses in the presence of a weak infrared laser field. We continuously control the energy of the photoelectrons and introduce an asymmetry in their emission direction, at variance with the idealized rules mentioned above. This control, made possible by the extreme temporal confinement of the light–matter interaction, opens a road in attosecond science, namely, the manipulation of ultrafast processes with a tailored sequence of attosecond pulses.

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“…The XUV pump pulses were focused by a pair of multi-layer mirrors, with an effective focal length of 1 m into a 3D electron and ion momentum imaging spectrometer, and the NIR probe pulses were focused by a spherical mirror of the same focal length. 3D momentum of the electron and D + recoil-ion were recorded in coincidence [33]. The results are presented in Fig.…”

Section: Discussionmentioning

confidence: 99%

Non-Equilibrium Dynamics in Two-Color, Few-Photon Dissociative Excitation and Ionization of D$_2$

Slaughter,

Sturm,

Bello

et al. 2021

Preprint

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D2 molecules, excited by linearly cross-polarized femtosecond extreme ultraviolet (XUV) and near-infrared (NIR) light pulses, reveal highly structured D + ion fragment momenta and angular distributions that originate from two different 4-step dissociative ionization pathways after four photon absorption (1 XUV + 3 NIR). We show that, even for very low dissociation kinetic energy release ≤ 240 meV, specific electronic excitation pathways can be identified and isolated in the final ion momentum distributions. With the aid of ab initio electronic structure and time-dependent Schrödinger equation calculations, angular momentum, energy, and parity conservation are used to identify the excited neutral molecular states and molecular orientations relative to the polarization vectors in these different photoexcitation and dissociation sequences of the neutral D2 molecule and its D + 2 cation. In one sequential photodissociation pathway, molecules aligned along either of the two light polarization vectors are excluded, while another pathway selects molecules aligned parallel to the light propagation direction. The evolution of the nuclear wave packet on the intermediate B 1 Σ + u electronic state of the neutral D2 molecule is also probed in real time.

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Attosecond Coherent Control of Single and Double Photoionization in Argon

Cited by 16 publications

References 38 publications

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

Controlling photoionization using attosecond time-slit interferences

Non-Equilibrium Dynamics in Two-Color, Few-Photon Dissociative Excitation and Ionization of D$_2$

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