Using theory and Cold Target Recoil Ion Momentum Spectroscopy we find signatures of light-induced molecular potential energy surfaces in the 3-dimensional proton momentum distributions of dissociating H+2. © 2020 Journal of Physics: Conference Series. All rights reserved

Corkum, P.B.

Dube, Z.

Kübel, M.

Naumov, A. Yu

Spanner, M.

Staudte, A.

Villeneuve, D.M.

Vrakking, M.J.J.

English

Repositorium für Naturwissenschaften und Technik

Journal of Physics: Conference SeriesPAPER • OPEN ACCESSSignatures of Light-Induced Potential EnergySurfaces in To cite this article: M Kübel et al 2020 J. Phys.: Conf. Ser. 1412 092017 View the article online for updates and enhancements.You may also likeSum rules and asymptotic behaviors ofneutrino mixing and oscillations in matterZhi-zhong Xing and Jing-yu Zhu-The commutator of raising and loweringoperators for angular momentum to thefree particle’s hamiltonianA F Sugihartin, B Supriadi, Subiki et al.-Hyperon and antihyperon physicsAndrzej Kupsc-This content was downloaded from IP address 94.134.197.189 on 18/11/2021 at 08:04Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distributionof this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Published under licence by IOP Publishing LtdICPEAC2019Journal of Physics: Conference Series 1412 (2020) 092017IOP Publishingdoi:10.1088/1742-6596/1412/9/0920171Signatures of Light-Induced Potential Energy Surfaces in H+2M Kübel1,2,3 ∗, M Spanner4, Z Dube1, A Yu Naumov1, M J J Vrakking5, P B Corkum1,D M Villeneuve1 and A Staudte1 †1Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada2Ludwig-Maximilians-Universitt Munich, Am Coulombwall 1, D-85748 Garching, Germany3Friedrich-Schiller Universitt Jena, Max-Wien-Platz 1, D-07743 Jena, Germany4National Research Council, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada5Max-Born-Institut, Max-Born-Strae 2A, D-12489 Berlin, GermanySynopsis Using theory and Cold Target Recoil Ion Momentum Spectroscopy we find signatures of light-inducedmolecular potential energy surfaces in the 3-dimensional proton momentum distributions of dissociating H+2 .H2 continues to provide fundamental insightsinto the mechanisms of intense light-matter inter-actions [1]. Recently, there has been significantinterest in so-called light-induced conical inter-sections (LICI) that arise from the angle depen-dence of the single-photon coupling of electronicstates. Analogously to regular conical intersec-tions, electronic and nuclear motions are stronglycoupled in the vicinity of LICIs. As a signatureof such rovibronic dynamics, weak modulationsin the angular distribution of protons emittedfrom H+2 have been reported [2]. More gener-ally speaking, infrared (IR) laser pulses couplethe σg and σu electronic states of H+2 typicallythrough several pathways involving an odd num-ber of photons [1], which can produce complexlight-induced potential energy landscapes, andconsequently even richer dynamics.Here, we report the observation of stronglystructured proton angular distributions obtainedfrom the dissociative ionization of H2. Our ex-periment relies on the STIER (Sub-cycle Trac-ing of Ionization Enabled by infraRed) technique[3], where an intense few-cycle visible pulse ion-izes H2 to H+2 . The cation subsequently disso-ciates under the influence of a moderately in-tense mid-IR (2300 nm) pulse, which is polar-ized perpendicularly to the visible pulse and doesnot cause ionization of H2 on its own. The 3-dimensional momentum of the ejected protonswere recorded using COLTRIMS (cold targetrecoil ion momentum spectroscopy). Figure 1a) shows the proton distribution produced in afew-cycle, 800 nm laser pulse. In Figure 1b) across-polarized, multi-cycle, 2300 nm pulse is su-perimposed. Strikingly, the weak mid-IR fielddoes not only add a contribution along its po-larization axis, but also produces angular fea-tures closer to the polarization of the visible laserpulse. Using numerical solutions of the time-dependent Schrdinger equation, we explain thefeatures of the measured momentum distributionas an angle-dependent competition of differentdissociation pathways in a complex light-inducedpotential energy landscape [4].Figure 1. Measured proton momentum distribu-tions produced by (a) a visible (730 nm) few-cyclepulse only and (b) and an additional mid-IR (2300nm) dressing field. The arrows indicate the laserpolarization.References[1] Ibrahim H et al 2018 J. Phys. B 51 42002[2] Natan A et al 2016 Phys. Rev. Lett. 116 1[3] Kbel M, et al 2017 Phys. Rev. Lett. 119 183201[4] Kbel M et al in preparation∗E-mail: matthias.kuebel@uni-jena.de†E-mail: andre.staudte@nrc.ca

Signatures of Light-Induced Potential Energy Surfaces in H2+

Synopsis Using theory and Cold Target Recoil Ion Momentum Spectroscopy we find signatures of light-induced molecular potential energy surfaces in the 3-dimensional proton momentum distributions of dissociating H 2 + 

Kübel, M

Spanner, M

Dube, Z

Naumov, A Yu

Vrakking, M J J

Corkum, P B

Villeneuve, D M

Staudte, A

Digitale Bibliothek Thüringen

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distributionof this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Published under licence by IOP Publishing LtdICPEAC2019Journal of Physics: Conference Series 1412 (2020) 092017IOP Publishingdoi:10.1088/1742-6596/1412/9/0920171Signatures of Light-Induced Potential Energy Surfaces in H+2M Kübel1,2,3 ∗, M Spanner4, Z Dube1, A Yu Naumov1, M J J Vrakking5, P B Corkum1,D M Villeneuve1 and A Staudte1 †1Joint Attosecond Laboratory, National Research Council and University of Ottawa, Ottawa, Ontario, Canada2Ludwig-Maximilians-Universitt Munich, Am Coulombwall 1, D-85748 Garching, Germany3Friedrich-Schiller Universitt Jena, Max-Wien-Platz 1, D-07743 Jena, Germany4National Research Council, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada5Max-Born-Institut, Max-Born-Strae 2A, D-12489 Berlin, GermanySynopsis Using theory and Cold Target Recoil Ion Momentum Spectroscopy we find signatures of light-inducedmolecular potential energy surfaces in the 3-dimensional proton momentum distributions of dissociating H+2 .H2 continues to provide fundamental insightsinto the mechanisms of intense light-matter inter-actions [1]. Recently, there has been significantinterest in so-called light-induced conical inter-sections (LICI) that arise from the angle depen-dence of the single-photon coupling of electronicstates. Analogously to regular conical intersec-tions, electronic and nuclear motions are stronglycoupled in the vicinity of LICIs. As a signatureof such rovibronic dynamics, weak modulationsin the angular distribution of protons emittedfrom H+2 have been reported [2]. More gener-ally speaking, infrared (IR) laser pulses couplethe σg and σu electronic states of H+2 typicallythrough several pathways involving an odd num-ber of photons [1], which can produce complexlight-induced potential energy landscapes, andconsequently even richer dynamics.Here, we report the observation of stronglystructured proton angular distributions obtainedfrom the dissociative ionization of H2. Our ex-periment relies on the STIER (Sub-cycle Trac-ing of Ionization Enabled by infraRed) technique[3], where an intense few-cycle visible pulse ion-izes H2 to H+2 . The cation subsequently disso-ciates under the influence of a moderately in-tense mid-IR (2300 nm) pulse, which is polar-ized perpendicularly to the visible pulse and doesnot cause ionization of H2 on its own. The 3-dimensional momentum of the ejected protonswere recorded using COLTRIMS (cold targetrecoil ion momentum spectroscopy). Figure 1a) shows the proton distribution produced in afew-cycle, 800 nm laser pulse. In Figure 1b) across-polarized, multi-cycle, 2300 nm pulse is su-perimposed. Strikingly, the weak mid-IR fielddoes not only add a contribution along its po-larization axis, but also produces angular fea-tures closer to the polarization of the visible laserpulse. Using numerical solutions of the time-dependent Schrdinger equation, we explain thefeatures of the measured momentum distributionas an angle-dependent competition of differentdissociation pathways in a complex light-inducedpotential energy landscape [4].Figure 1. Measured proton momentum distribu-tions produced by (a) a visible (730 nm) few-cyclepulse only and (b) and an additional mid-IR (2300nm) dressing field. The arrows indicate the laserpolarization.References[1] Ibrahim H et al 2018 J. Phys. B 51 42002[2] Natan A et al 2016 Phys. Rev. Lett. 116 1[3] Kbel M, et al 2017 Phys. Rev. Lett. 119 183201[4] Kbel M et al in preparation∗E-mail: matthias.kuebel@uni-jena.de†E-mail: andre.staudte@nrc.ca

Signatures of Light-Induced Potential Energy Surfaces in H 2 +

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Signatures of Light-Induced Potential Energy Surfaces in H2+

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