Charge-distribution effect of imaging molecular structure by high-order above-threshold ionization

Wang, Bingbing; Guo, Yingchun; Bin, Zhang; Zhao, Zengxiu; Yan, Zong-Chao; Fu, Panming

doi:10.1103/physreva.82.043402

Cited by 19 publications

(17 citation statements)

References 33 publications

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“…For example, HHG can be used to obtain ultrashort attosecond pulses [4,5] and to image atomic or molecular structures [6][7][8][9][10], HATI can be used to investigate molecular structures [11][12][13][14][15] and dynamics [16], and NSDI shows that the multielectron ionization in an intense laser field is not always sequentially one by one [17][18][19][20][21][22]. It is often the case that these three phenomena, i.e., HHG, HATI, and NSDI, may occur during a single recollision process, implying that we may treat them under a unified theoretical frame.…”

Section: Introductionmentioning

confidence: 99%

“…It is often the case that these three phenomena, i.e., HHG, HATI, and NSDI, may occur during a single recollision process, implying that we may treat them under a unified theoretical frame. One such approach is the frequency-domain theory based on the nonperturbative quantum electrodynamics (QED) [23], which has recently been developed to deal with recollision processes [13,15,[24][25][26][27], including HHG and HATI. By using this theory, Fu et al [25] have investigated the relationship between ATI and HHG and found that the origin of the plateau on a HHG spectrum is attributed to a laser-assisted recombination process.…”

Section: Introductionmentioning

confidence: 99%

“…By using this theory, Fu et al [25] have investigated the relationship between ATI and HHG and found that the origin of the plateau on a HHG spectrum is attributed to a laser-assisted recombination process. Recently, Guo et al [13] have investigated the interference fringes in the HATI spectra of molecules and found the charge distribution effect of imaging the molecular structure by HATI [15].…”

Section: Introductionmentioning

confidence: 99%

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Frequency-domain theory of nonsequential double ionization in intense laser fields based on nonperturbative QED

et al. 2012

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We study nonsequential double ionization (NSDI) processes of an atom by applying the frequency-domain theory based on the nonperturbative quantum electrodynamics. We obtain the transition formulas that describe the NSDI processes caused by the collision ionization (CI) and the collision-excitation ionization (CEI) mechanisms. By analyzing the NSDI results of each above-threshold ionization (ATI) channel, we investigate the contributions to the NSDI from the backward and forward collisions. In particular, for the CI process, the backward collision makes a major contribution to the NSDI probability, whereas for the CEI process, it depends on the characteristics of the laser-atom system: if the energy that the recolliding electron needs to excite a bound electron is much larger than the laser photon energy, such as for the case of helium in this work, the backward collision dominates the contribution; otherwise, the forward collision dominates the contribution. We also discuss the source of interference fringes in the NSDI momentum spectra due to the CI mechanism and find that the fringes can be predicted by using a simple cosine function. This work can be regarded as a development of the frequency-domain theory, which may shed light on the study of multiparticle dynamics in intense laser fields.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency-domain theory of nonsequential double ionization in intense laser fields based on nonperturbative QED

et al. 2012

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“…In addition, by using an intense few-cycle laser and an ultraviolet attosecond pulse, Zhao et al [27] obtained an isolated 53-as pulse. Moreover, Chen et al [28] advised a mechanism to generate an isolated sub-50-as pulse by quantum path control in the multicycle regime. Recently, Lu et al [29] proposed a three-color field scheme in which an effect of a 3-fs driving field is achieved by utilizing two weak pulses to modify a fundamental one, and a continuum with a bandwidth of 195 eV supporting a 21-as pulse was obtained.…”

Section: Introductionmentioning

confidence: 99%

Extending the High-Order Harmonics Plateau and Isolated Attosecond Pulse Generation in an Intense Three-Color Laser Field

Miao

2012

Spectroscopy Letters

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We propose a method to extend the high-order harmonics plateau and generate an isolated sub-10-as pulse by adding a weak control pulse (10 fs, 1600 nm) to modify a two-color laser field (5 fs, 800 nm; 10 fs, 400 nm). The numerical results show that the plateau is extended obviously in the three-color laser field regime. Additionally, the ionization rate and classical returning kinetic-energy maps are calculated to better understand the physical origin of the high-order harmonics generation (HHG). By means of the ionization probability and the time-frequency distributions, more features of the HHG are revealed. Furthermore, our simulations show that the width of the plateau and the relative conversion efficiency of the harmonic spectra are highly dependent on the relative phase. Finally, by adjusting the relative phase and superposing a properly selected range of the HHG spectrum, an isolated attosecond pulse with a duration of 7 as is obtained.

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“…It should be mentioned that various variants of semianalytical theories of the strong-field ionization of polyatomic molecules, which is the main subject of our paper, were presented in Refs. [28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Strong-field approximation for above-threshold ionization of polyatomic molecules

Hasović

Milošević

2012

Phys. Rev. A

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We consider above-threshold ionization of polyatomic molecules by a strong laser field within the molecular strong-field approximation (MSFA). A polyatomic molecule is modeled by an (N + 1)-particle system, which consists of N heavy atomic (ionic) centers and an electron. After the separation of the center-of-mass coordinate, the dynamics of this system is reduced to the relative electronic and nuclear coordinates. Two forms of the MSFA, one with the field-free and the other with the field-dressed initial molecular bound state, are derived. For neutral polyatomic molecules the ionization amplitude takes a simple form which allows interpretation as a multiple-slit-type interference. This is illustrated by a numerical example for the ozone molecule.

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Charge-distribution effect of imaging molecular structure by high-order above-threshold ionization

Cited by 19 publications

References 33 publications

Frequency-domain theory of nonsequential double ionization in intense laser fields based on nonperturbative QED

Frequency-domain theory of nonsequential double ionization in intense laser fields based on nonperturbative QED

Extending the High-Order Harmonics Plateau and Isolated Attosecond Pulse Generation in an Intense Three-Color Laser Field

Strong-field approximation for above-threshold ionization of polyatomic molecules

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