Tunneling ionization of vibrationally excited nitrogen molecules

Kornev, A. S.; Zon, B. A.

doi:10.1103/physreva.92.033420

Cited by 11 publications

(21 citation statements)

References 53 publications

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“…Alternatively, based on the MO-ADK model, Zon et al proposed an anti-stokes-enhanced tunneling ionization (ASETI) method to investigate the effect of vibrational motion on the strong field ionization of molecules. [27][28][29] In their method, the Dyson orbital wavefunctions including nuclear motion are used as the molecular wavefunctions, and the ionization rate of molecules in the TI regime is described by the combination of the Frank-Condon factors between the neutral and ionic electronic states and the ADK ionization rate, which is dependent on the ionization potential. [27][28][29] According to this ASETI model, we can qualitatively understand the experimental observation in Fig.…”

Section: Discussionmentioning

confidence: 99%

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Zuo¹,

Lv²,

Liang³

et al. 2018

Chinese Phys. B

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By using a heated molecular beam in combination with a time-of-flight mass spectrometer, we experimentally study the ionization of vibrational-hot carbon disulfide (CS 2 ) molecules irradiated by a linearly polarized 800-nm 50-fs strong laser field. The ion yields are measured in a laser intensity range of 7.0 × 10 12 W/cm 2 -1.5 × 10 14 W/cm 2 at different molecular temperatures of up to 1400 K. Enhanced ionization yield is observed for vibrationally excited CS 2 molecules. The results show that the enhancement decreases as the laser intensity increases, and exhibits non-monotonical dependence on the molecular temperature. According to the calculated potential energy curves of the neutral and ionic electronic states of CS 2 , as well as the theoretical models of molecular strong-field ionization available in the literature, we discuss the mechanism of the enhanced ionization of vibrational-hot molecules. It is indicated that the enhanced ionization could be attributed to both the reduced ionization potential with vibrational excitation and the Frank-Condon factors between the neutral and ionic electronic states. Our study paves the way to understanding the effect of nuclear motion on the strongfield ionization of molecules, which would give a further insight into theoretical and experimental investigations on the interaction of polyatomic molecules with strong laser fields.

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Section: Discussionmentioning

confidence: 99%

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Zuo¹,

Lv²,

Liang³

et al. 2018

Chinese Phys. B

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“…Ionization rates for H-like ions are well established through the tunneling-rate formula originally derived by Smirnov and Chibisov [8], which has also been referred to as the Perelemov-Popov-Terent'ev (PPT) formula [9][10][11] or the Ammosov-Delone-Krainov (ADK) [12] formula, providing reliable estimates of the ionization rates in the tunneling regime. Within the single-active electron approximation, the ADK theory has been extended to molecular systems [13][14][15][16][17]. Attempts have also been made to include many-electron effects in static-field tunneling ionization [18,19].…”

Section: Introductionmentioning

confidence: 99%

Static-field ionization model of He-like ions for diagnostics of light-field intensity

2020

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We study static-field ionization of He-like ions with nuclear charge number in the range of 2 ≤ Z ≤ 36. Both the tunneling and over-the-barrier regimes are considered. We calculate the ionization rates by three approximate methods: a fitting formula based on the Perelemov-Popov-Terent'ev (PPT) formula, a perturbative expansion in powers of 1/Z, and a single-active electron approximation, and compare them with reference ionization rates computed by the multiconfiguration time-dependent Hartree-Fock (MCTDHF) approach. The relative deviation of the rates computed by the PPT-based fitting formula and the third-order perturbation theory from the rates computed by the MCTDHF approach is found to be around 10%. We discuss quantitatively the contribution from the exchange interaction during the ionization by comparing the single-active electron rates and the reference rates in which multielectron effects are included. We find that a single-active electron approximation, where the exchange interaction is neglected, results in the overestimation of the ionization rates by 30% for He and 2% for He-like Kr, showing that the magnitude of the effect of the exchange interaction scales approximately as 1/Z.

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“…This theory is a direct transformation of the Keldysh theory for tunnel ionization of atoms to molecules. Earlier, the vibra tional degrees of freedom of molecules in the MOADK model were accurately taken into account [11][12][13]. It was also shown that the rate of molecular ion formation in an excited vibrational state does not always turn out to be lower than that in the ground vibrational state.…”

Section: Introductionmentioning

confidence: 99%

“…All these effects, often referred to in the literature as lightdressing, lead to changes in the Franck-Condon factors, which, in turn, affects the prob ability of ionization. For example, it was demonstrated in [13] that the aboveindicated effects for the SO 2 molecule lead to a 20 times change in the ionization probability.…”

Section: Introductionmentioning

confidence: 99%

Tunnel ionization of diatomic atmospheric gases (N₂, O₂) by laser radiation

Kopytin¹,

Kornev²,

Zon³

2019

Laser Phys.

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We present the results of calculation of the rates of tunnel ionization of N 2 and O 2 molecules from the ground and excited vibrational states by linearly polarized laser radiation. These data are necessary for the theoretical description of filamentation. For N 2 , we consider ionization from the 3σ g and 1π u shells, which give comparable contributions. For O 2 , we consider ionization from both the ground X 3 Σ − g and excited a 1 ∆ g electronic terms. We demonstrate that for N 2 , the ionization rate is maximum when the electric field vector of laser radiation is directed along the molecular axis (for 3σ g shell) or perpendicular to it (for 1π u shell), whereas for the O 2 molecule, for both electronic states considered, the rates have maxima when the angle between the electric field and molecular axis is equal to 45°.

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Tunneling ionization of vibrationally excited nitrogen molecules

Cited by 11 publications

References 53 publications

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Static-field ionization model of He-like ions for diagnostics of light-field intensity

Tunnel ionization of diatomic atmospheric gases (N₂, O₂) by laser radiation

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Tunneling ionization of vibrationally excited nitrogen molecules

Cited by 11 publications

References 53 publications

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Static-field ionization model of He-like ions for diagnostics of light-field intensity

Tunnel ionization of diatomic atmospheric gases (N2, O2) by laser radiation

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Tunnel ionization of diatomic atmospheric gases (N₂, O₂) by laser radiation