Orientation dependence of the ionization of CO and NO in an intense femtosecond two-color laser field

Li, H.; Ray, D.; De, Sankar; Znakovskaya, I.; Cao, Wei; Laurent, Guillaume; Wang, Zhenhua; Kling, Matthias F.; Le, Anh-Thu; Cocke, C. L.

doi:10.1103/physreva.84.043429

Cited by 117 publications

(115 citation statements)

References 33 publications

(77 reference statements)

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“…[22] that the Stark shift had to be taken into account in a modified MO-ADK theory in order to reproduce the experimental data for carbonyl sulfide (OCS). However the measurements for the CO molecule [23][24][25] showed that the Stark-corrected MO-ADK (or SC-MOADK) disagrees strongly with experiments. On the contrary to the OCS case, these results imply that the Stark effect should play a minor role in tunneling ionization from CO.…”

Section: Introductionmentioning

confidence: 97%

“…The agreement between the WFAT and SC-MOADK is expected since the SC-MOADK theory can be approximately reduced to the WFAT. Note that the more involved strong-field approximation (SFA) [28] can also be extended to polar molecules [23,29]. However, the standard SFA generally suffers from the gauge-dependence problem [30], and the results are origin dependent [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules

Hoang

Zhao

et al. 2017

Phys. Rev. A

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We present a detailed theoretical investigation on strong-field ionization of polar (CO and NO) as well as nonpolar molecules (N 2 , O 2 , and CO 2 ). Our results indicate that accounting for the Stark correction in the molecular tunneling ionization theory leads to overall fairly good agreements with numerical solutions of the time-dependent Schrödinger equation. Furthermore, we show that the effect of dynamic core-electron polarization, in general, has a weak influence on the angle-dependent ionization probability. However, in the case of CO we confirm the recent finding by B. Zhang, J. Yuan, and Z. Zhao [Phys. Rev. Lett. 111, 163001 (2013)] that accounting for dynamic core-polarization is crucial to achieving an overall good agreement with experiments.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules

Hoang

Zhao

et al. 2017

Phys. Rev. A

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“…For linearly polarized light, on the other hand, one experiment reports most ionization from the Send [88], while another most perpendicular to the molecular axis [89]. For the CO molecule, as another example, strong-field ionization experiments performed in the tun- neling regime report that ionization occurs most readily when the external field has a component pointing from the C-to the O-end, and the electron leaves from the C-end [90][91][92]. This is in contrast with the results from application [87,93] of SAE approximation tunneling theory [84], which predicts that ionization is most likely when the field points from the O-to the C-end.…”

Section: Strong-field Ionizationmentioning

confidence: 99%

Time-dependent generalized-active-space configuration-interaction approach to photoionization dynamics of atoms and molecules

2014

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We present a wave-function based method to solve the time-dependent many-electron Schrödinger equation (TDSE) with special emphasis on strong-field ionization phenomena. The theory builds on the configuration-interaction (CI) approach supplemented by the generalized-active-space (GAS) concept from quantum chemistry. The latter allows for a controllable reduction in the number of configurations in the CI expansion by imposing restrictions on the active orbital space. The method is similar to the recently formulated time-dependent restricted-active-space (TD-RAS) CI method [D. Hochstuhl, and M. Bonitz, Phys. Rev. A 86, 053424 (2012)]. We present details of our implementation and address convergence properties with respect to the active spaces and the associated account of electron correlation in both ground state and excitation scenarios. We apply the TD-GASCI theory to strong-field ionization of polar diatomic molecules and illustrate how the method allows us to uncover a strong correlation-induced shift of the preferred direction of emission of photoelectrons.

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“…The contribution of the ionization-depletion mechanism is particularly challenging to model because the calculation of strong-field ionization rates of polar molecules is an active field of research with results that differ qualitatively, e.g. for CO molecules [42,49,62,63].…”

mentioning

confidence: 99%

Two-pulse orientation dynamics and high-harmonic spectroscopy of strongly-oriented molecules

Kraus

Baykusheva

Wörner

2014

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

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Abstract. We present the detailed analysis of a new two-pulse orientation scheme that achieves macroscopic field-free orientation at the high particle densities required for attosecond and high-harmonic spectroscopies [P. M. Kraus et al., arxiv:1311.3923]. Carbon monoxide (CO) molecules are oriented by combining a one-color and a delayed two-color non-resonant femtosecond laser pulses. High-harmonic generation is used to probe the oriented wave-packet dynamics and reveals that a very high degree of orientation (N up /N total = 0.82) is achieved. We further extend this approach to orienting carbonyl sulfide (OCS) molecules. We show that the present two-pulse scheme selectively enhances orientation created by the hyperpolarizability interaction whereas the ionization-depletion mechanism plays no role. We further control and optimize orientation through the delay between the one-and two-color pump pulses. Finally, we demonstrate a complementary encoding of electronic structure features, such as shape resonances, in the even-and odd-harmonic spectrum. The achieved progress makes two-pulse field-free orientation an attractive tool for a broad class of time-resolved measurements.

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Orientation dependence of the ionization of CO and NO in an intense femtosecond two-color laser field

Cited by 117 publications

References 33 publications

Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules

Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules

Time-dependent generalized-active-space configuration-interaction approach to photoionization dynamics of atoms and molecules

Two-pulse orientation dynamics and high-harmonic spectroscopy of strongly-oriented molecules

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