Photoelectron angular distributions: developments in applications to isolated molecular systems

Reid, Katharine L.

doi:10.1080/00268976.2011.640292

Cited by 110 publications

(102 citation statements)

References 105 publications

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“…However, it is not f el, but rather f el mol , the phase of the laser field relative to the molecular axis at time t i , which determines the degree of anisotropy in bond breaking. The molecular-frame photoelectron angular distribution 16 has been widely used to probe the molecular geometry and dynamics. By assuming inversion symmetry, symmetric photoelectron angular distributions were expected and used to interpret the measured data 17 over the angular range of 0-p/2.…”

Section: Resultsmentioning

confidence: 99%

Understanding the role of phase in chemical bond breaking with coincidence angular streaking

Magrakvelidze

Schmidt

et al. 2013

Nat Commun

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Electron motion in chemical bonds occurs on an attosecond timescale. This ultrafast motion can be driven by strong laser fields. Ultrashort asymmetric laser pulses are known to direct electrons to a certain direction. But do symmetric laser pulses destroy symmetry in breaking chemical bonds? Here we answer this question in the affirmative by employing a two-particle coincidence technique to investigate the ionization and fragmentation of H 2 by a long circularly polarized multicycle femtosecond laser pulse. Angular streaking and the coincidence detection of electrons and ions are employed to recover the phase of the electric field, at the instant of ionization and in the molecular frame, revealing a phase-dependent anisotropy in the angular distribution of H þ fragments. Our results show that electron localization and asymmetrical breaking of molecular bonds are ubiquitous, even in symmetric laser pulses. The technique we describe is robust and provides a powerful tool for ultrafast science.

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Section: Resultsmentioning

confidence: 99%

Understanding the role of phase in chemical bond breaking with coincidence angular streaking

Magrakvelidze

Schmidt

et al. 2013

Nat Commun

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“…(In this connection, see [45] for the control of the resonant two-color two-photon excitation yield and [46] for the control of the photoelectron angular distributions of the nonperturbative resonant multi-photon ionization with ultrashort polarization-shaped pulses. See also a very recent review article for photoelectron angular distributions [47]. )…”

Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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We theoretically study the photoelectron angular distribution (PAD) from the two-photon single ionization of H and He by femtosecond and attosecond extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schrödinger equation. The PAD is formed by the interference of the s and d continuum wave packets, and, thus, contains the information on the relative phase δ and amplitude ratio between them. We find that, when a spectrally broadened femtosecond pulse is resonant with an excited level, the PAD substantially changes with pulse width, since the competition between resonant and nonresonant ionization paths, leading to δ distinct from the scattering phase shift difference, changes with it. In contrast, when the Rydberg manifold is excited, and for the case of above-threshold two-photon ionization, δ and the PAD do not depend much on pulse width, except for the attosecond region. Thus, the Rydberg manifold and the continuum behave similarly in this respect. For a high-harmonic pulse composed of multiple harmonic orders, while the value of δ is different from that for a single-component pulse, the PAD still rapidly varies with pulse width. The present results illustrate a new way to tailor the continuum wave packet.

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“…[20] for the control of the resonant two-color two-photon excitation yield and Ref [21] for the control of the photoelectron angular distributions of the nonperturbative resonant multiphoton ionization with ultrashort polarization-shaped pulses. See also a very recent review article for photoelectron angular distributions [22]. )…”

mentioning

confidence: 99%

Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

Motomura

Ishikawa

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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Phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets generated by two-photon ionization of helium atoms are determined from the photoelectron angular distributions obtained using velocity map imaging. Helium atoms are ionized with ultrashort extreme-ultraviolet free-electron laser pulses with a photon energy of 20.3, 21.3, 23.0, and 24.3 eV, produced by the SPring-8 Compact SASE Source test accelerator. The measured values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to an excited level or Rydberg manifold. The difference stems from the competition between resonant and non-resonant paths in two-photon ionization by ultrashort pulses. Since the competition can be controlled in principle by the pulse shape, the present results illustrate a new way to tailor the continuum wave packet.

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Photoelectron angular distributions: developments in applications to isolated molecular systems

Cited by 110 publications

References 105 publications

Understanding the role of phase in chemical bond breaking with coincidence angular streaking

Understanding the role of phase in chemical bond breaking with coincidence angular streaking

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

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