Laser-driven electron recollision remembers molecular orbital structure

May 4, 2018, Forschungsverbund Berlin e.V. (FVB)
Continuum electronic wavepackets for strong-field ionization channel 1 and 2 in 1,3-trans-butadiene shortly after ionization. Credit: MBI Berlin

Scientists from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) in Berlin combined state-of-the-art experiments and numerical simulations to test a fundamental assumption underlying strong-field physics. Their results refine our understanding of strong-field processes such as high harmonic generation (HHG) and laser-induced electron diffraction (LIED).

Scientists from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) in Berlin combined state-of-the-art experiments and to test a fundamental assumption underlying strong-field physics. Their results refine our understanding of strong-field processes such as high harmonic generation (HHG) and laser-induced electron diffraction (LIED).

Strong can extract an electron from a molecule (ionization), accelerate it away into free space, then turn it around (propagation), and finally collide it with the molecule (recollision). This is the widely used three-step model of strong-field physics. In the recollision step, the electron may, for example, recombine with the parent ion, giving rise to high harmonic generation, or scatter elastically, giving rise to laser-induced electron diffraction.

One of the commonly used assumptions underlying attosecond is that, in the propagation step, the initial structure of the ionized electron is "washed out", thus losing the information on the originating orbital. So far, this assumption was not experimentally verified in molecular systems.

A combined experimental and theoretical study at the Max Born Institute Berlin investigated the strong-field driven electron recollision dynamics in the 1,3-trans-butadiene molecule. In this molecule, the interaction with the strong laser field leads mainly to the ionization of two outermost electrons exhibiting quite different densities. The state-of-the-art experiments and simulations then allowed the scientists to measure and calculate the high-angle rescattering probability for each electron separately. These probabilities turned out to be quite different both in the measurements and in the simulations. These observations clearly demonstrate that the returning electrons do retain structural information on their initial molecular orbital.

The study is published in Science Advances.

Explore further: Spin polarization by strong field ionization

More information: "Molecular orbital imprint in laser-driven electron recollision" Science Advances, advances.sciencemag.org/content/4/5/eaap8148

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Hyperfuzzy
not rated yet May 05, 2018
What do you mean structural? Orbital Momentum? Location? Polarization?
milnik
1 / 5 (3) May 05, 2018
Is it possible that such scientists did not yet understand the structure of matter and the way it is formed and what is formed. If this is not known, every action in the field is a kind of game where gentle nothing is and how this game works. If lasers maltreate the molecule, do you know what you are changing there and how to capture the natural course of functioning of this atom. This game is the same as when a group of children perform some exercises, and a couple of ruthless hooligans start shooting them with stones to see how they will behave.
swordsman
1 / 5 (1) May 05, 2018
The pictures are not sufficiently described. It is not yet possible to view an electron due to its very small size. This would require an extremely short wave length that is yet to be obtained, which would also involve a very high energy. Perhaps the description needs some further elaboration. What they may be seeing is a very large molecule with very low energy states. Please give us better details in this regard.
jonesdave
4 / 5 (4) May 05, 2018
The pictures are not sufficiently described. It is not yet possible to view an electron due to its very small size. This would require an extremely short wave length that is yet to be obtained, which would also involve a very high energy. Perhaps the description needs some further elaboration. What they may be seeing is a very large molecule with very low energy states. Please give us better details in this regard.


The paper is linked to below the article. Free access: http://advances.s...148.full
Hyperfuzzy
5 / 5 (1) May 05, 2018
ok, i'm the center of a polarize field; i respond to any field properly defined: say, to my perspective; i see, the field as a charge at a given location, at every point in time; i also see any reflected fields; i don't collide! i ride the wave; wherever ya put zero! i like my dimensions, set c = 1; then T = Lambda; so what we are seeing is only dimensionally relevant; i.e. smallest tick-mark to define relevant field events; every wavelength is due to motion of a center or set of centers; but, each wavelet is unique. so. the updates appear simultaneously and are already laid out; choice of visual aids. i'm invisible, no really; my path unique. quanta? get real

yeah respond; think simultaneous at the same time; com'on, i'm a video game;
Hyperfuzzy
not rated yet May 05, 2018
ok, i'm the center of a polarize field; i respond to any field properly defined: say, to my perspective; i see, the field as a charge at a given location, at every point in time; i also see any reflected fields; i don't collide! i ride the wave; wherever ya put zero! i like my dimensions, set c = 1; then T = Lambda; so what we are seeing is only dimensionally relevant; i.e. smallest tick-mark to define relevant field events; every wavelength is due to motion of a center or set of centers; but, each wavelet is unique. so. the updates appear simultaneously and are already laid out; choice of visual aids. i'm invisible, no really; my path unique. quanta? get real

yeah respond; think simultaneous at the same time; com'on, i'm a video game;

just informed, no game

holoman
not rated yet May 06, 2018
uv photon induced electric field poling of ferroelectric molecule and quantum holographic storage.

https://drive.goo...c06vLT90
Hyperfuzzy
not rated yet May 06, 2018
uv photon induced electric field poling of ferroelectric molecule and quantum holographic storage.

https://drive.goo...c06vLT90


Not holistic, why do you used magnetic storage; it takes a volume; charge is a point; a photon does not exist.
holoman
not rated yet May 06, 2018
uv photon induced electric field poling of ferroelectric molecule and quantum holographic storage.

https://drive.goo...c06vLT90


Not holistic, why do you used magnetic storage; it takes a volume; charge is a point; a photon does not exist.


Magnetic storage is archaic technology. Using UV photons and electrostatic field can yield higher densities, faster transfers for read and writes, none volatile. Each ferroelectric molecules can no only be used as a binary switch but under influence of rotating disk and lay down 3D volumes of data. Extremely small penetrating x, y, z (cubic inch) laser spots of 300 angstroms and less can be written and read using integrated optical head structure with write densities of Teraword cubic inch (in3) and Teraword cubic inch (in3) read bandwidths with no end in sight. Magnetic storage is at nearing end of life. We need better technology going forward.

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