Enhanced Ionization of Molecules in Intense Laser Fields

Bandrauk, André D.; Légaré, François

doi:10.1007/978-3-642-28726-8_2

Cited by 16 publications

(34 citation statements)

References 86 publications

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“…In practice, for its magnitude , the characteristic speed of the electronic initial bound state in the Coulomb field according to the virial theorem, | | = √︀ 2 | |, is used. Tunneling processes beyond the simple Keldysh picture have been identified for molecules which originate from the multicenter character of the binding potential (for a review see Bandrauk and Légaré, 2012). For example, differences in the timing of tunneling ionization originating from different force centers or different molecular orbitals have been explored (Takemoto and Becker, 2010;Bian and Bandrauk, 2012).…”

Section: Attosecond Streaking Of Tunneling Time?mentioning

confidence: 99%

Attosecond chronoscopy of photoemission

2015

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Recent advances in the generation of well characterized sub-femtosecond laser pulses have opened up unpredicted opportunities for the real-time observation of ultrafast electronic dynamics in matter. Such attosecond chronoscopy allows a novel look at a wide range of fundamental photophysical and photochemical processes in the time domain, including Auger and autoionization processes, photoemission from atoms, molecules, and surfaces, complementing conventional energy-domain spectroscopy. Attosecond chronoscopy raises fundamental conceptual and theoretical questions as which novel information becomes accessible and which dynamical processes can be controlled and steered. These questions are currently a matter of lively debate which we address in this review. We will focus on one prototypical case, the chronoscopy of the photoelectric effect by attosecond streaking. Is photoionization instantaneous or is there a finite response time of the electronic wavefunction to the photoabsorption event? Answers to this question turn out to be far more complex and multi-faceted than initially thought. They touch upon fundamental issues of time and time delay as observables in quantum theory. We review recent progress of our understanding of time-resolved photoemission from atoms, molecules, and solids. We will highlight the unresolved and open questions and we point to future directions aiming at the observation and control of electronic motion in more complex nanoscale structures and in condensed matter.

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Section: Attosecond Streaking Of Tunneling Time?mentioning

confidence: 99%

Attosecond chronoscopy of photoemission

2015

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“…Within the model presented in the previous section, we consider the two center problem in a static electric field which allows to describe molecular CREI in intense laser fields [16,17]:…”

Section: Wtk Theory and The Position Of Resonancesmentioning

confidence: 99%

“…The mechanism we are proposing borrows ideas from a well-known mechanism in molecular high intensity laser physics, namely Charge Resonance Enhanced Ionization (CREI), which describes the non-perturbative ionization of diatomic molecules [16,17]. Our main idea is to use the interaction of a laser field with a fully stripped diatomic molecule (two-center system) [18].…”

Section: Introductionmentioning

confidence: 99%

“…In this proceeding, the REPP is studied in a very simple one-dimensional model: the two nuclei are modeled by delta function potential wells while the laser field is treated in the adiabatic regime. In this limit, we can consider a static electric field corresponding to the extrema of the field oscillations of an intense laser pulse [17,20]. Although this model is very simple, it contains the main physical features allowing to investigate the REPP mechanism.…”

Section: Introductionmentioning

confidence: 99%

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New mechanism for the generation of electron-positron pairs in Laser-Matter Interaction: Resonantly Enhanced Pair Production in a molecular system

Fillion‐Gourdeau

Lorin

Bandrauk

2013

J. Phys.: Conf. Ser.

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Abstract.A new mechanism for pair production from the interaction of a laser with two nuclei is presented. The latter takes advantage of the Stark effect in diatomic molecules and the presence of molecular resonances in the negative and positive energy continua. Both move in the complex energy plane as the interatomic distance and the electric field strength are varied. We demonstrate that there is an enhancement of pair production at the crossing of these resonances. This mechanism is studied in a very simple one-dimensional model where the nuclei are modeled by delta function potential wells and the laser by a constant electric field. The position of resonances is evaluated by using the Weyl-Titchmarch-Kodaira theory, which allows to treat singular boundary value problems and to compute the spectral density. The rate of producing pairs is also computed. It is shown that this process yields a positron production rate which is approximately an order of magnitude higher than in the single nucleus case and a few orders of magnitudes higher than Schwinger's tunneling result in a static field.

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“…9,10,34,[47][48][49][50] For H + 2 and H 2 , it has been shown that charge resonance transitions and localization of the electronic wavefunction are responsible for this Charge-Resonance Enhanced Ionization (CREI) at critical internuclear distances. 47,48 Several numerical simulations have been carried out for the ionization of H + 2 as a function of bond length.…”

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confidence: 99%

Strong field ionization rates simulated with time-dependent configuration interaction and an absorbing potential

Krause

Sonk

Schlegel

2014

The Journal of Chemical Physics

100

127

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Ionization rates of molecules have been modeled with time-dependent configuration interaction simulations using atom centered basis sets and a complex absorbing potential. The simulations agree with accurate grid-based calculations for the ionization of hydrogen atom as a function of field strength and for charge resonance enhanced ionization of H2(+) as the bond is elongated. Unlike grid-based methods, the present approach can be applied to simulate electron dynamics and ionization in multi-electron polyatomic molecules. Calculations on HCl(+) and HCO(+) demonstrate that these systems also show charge resonance enhanced ionization as the bonds are stretched.

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Enhanced Ionization of Molecules in Intense Laser Fields

Cited by 16 publications

References 86 publications

Attosecond chronoscopy of photoemission

Attosecond chronoscopy of photoemission

New mechanism for the generation of electron-positron pairs in Laser-Matter Interaction: Resonantly Enhanced Pair Production in a molecular system

Strong field ionization rates simulated with time-dependent configuration interaction and an absorbing potential

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