Tunneling electron recaptured by an atomic ion or a molecular ion

Xie, Xiguo; Liu, Hong; Li, Min; Deng, Yongkai; Liu, Yunquan; Gong, Qihuang; Wu, Chengyin

doi:10.1103/physreva.88.065401

Cited by 16 publications

(14 citation statements)

References 25 publications

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“…The argon dimer occupies about 1%−2% of the total gas, and larger clusters also exist with a much smaller fraction. 40,41 The laser pulse centered at 780 nm with a temporal duration of 25 fs is generated from an amplified Ti:sapphire laser system and is focused by a spherical mirror with a 75 mm focal length. The intensity is calibrated by measuring the ratio Ar 2+ /Ar + .…”

Section: Experiments Methodsmentioning

confidence: 99%

“…The experiment is carried out on a home-built cold target recoil ion momentum spectroscopy (COLTRIMS). , The argon dimer is generated by supersonic expansion of argon gas through a 30 μm nozzle into the vacuum chamber. The argon dimer occupies about 1%–2% of the total gas, and larger clusters also exist with a much smaller fraction. , The laser pulse centered at 780 nm with a temporal duration of 25 fs is generated from an amplified Ti:sapphire laser system and is focused by a spherical mirror with a 75 mm focal length. The intensity is calibrated by measuring the ratio Ar 2+ /Ar + . , The supersonic beam then intersects with the laser pulse at the focal spot.…”

Section: Experiments Methodsmentioning

confidence: 99%

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Dissociative Ionization of Argon Dimer by Intense Femtosecond Laser Pulses

et al. 2017

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We experimentally and theoretically studied dissociative ionization of argon dimer driven by intense femtosecond laser pulses. In the experiment, we measured the ion yield and the angular distribution of fragmental ions generated from the dissociative ionization channels of (1,1) (Ar → Ar + Ar) and (2,1) (Ar → Ar + Ar) using a cold target recoil ion momentum spectroscopy. The channel ratio of (2,1)/(1,1) is 4.5-7.5 times of the yield ratio of double ionization to single ionization of argon monomer depending on the laser intensity. The measurement verified that the ionization of Ar is greatly enhanced if there exists a neighboring Ar separated by a critical distance. In addition, the fragmental ions exhibit an anisotropic angular distribution with the peak along the laser polarization direction and the full width at half maximum becomes broader with increasing laser intensity. Using a full three-dimensional classical ensemble model, we calculated the angle-dependent multiple ionization probability of argon dimer in intense laser fields. The results show that the experimentally observed anisotropic angular distribution of fragmental ions can be attributed to the angle-dependent enhanced ionization of the argon dimer in intense laser fields.

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Section: Experiments Methodsmentioning

confidence: 99%

Section: Experiments Methodsmentioning

confidence: 99%

Dissociative Ionization of Argon Dimer by Intense Femtosecond Laser Pulses

et al. 2017

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“…This process can be coined as frustrated double ionization (FDI). FDI has been the focus of intense studies for various molecular systems such as H 2 [11,12], D 2 [13,14], O 2 [15], N 2 [16], CO [17], and clusters [18][19][20][21]. However, FDI of atoms has attracted much less attention.…”

Section: Introductionmentioning

confidence: 99%

Frustrated double ionization of atoms in circularly polarized laser fields

Kang,

Chen,

Chen

et al. 2020

Preprint

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We theoretically study frustrated double ionization (FDI) of atoms subjected to intense circularly polarized laser pulses using a three-dimensional classical model. We find a novel "knee" structure of FDI probability as a function of intensity, which is similar to the intensity dependence of nonsequential double ionization probability. The observation of FDI is more favourable when using targets with low ionization potentials and short driving laser wavelengths. This is attributed to the crucial role of recollision therein, which can be experimentally inferred from the photoelectron momentum distribution generated by FDI. This work provides novel physical insights into FDI dynamics with circular polarization.

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“…In addition to the tunneling ionization channel, there exists a neutral exit channel when atoms or molecules are exposed to intense laser fields, i.e., the frustrated tunneling ionization (FTI) channel, where the ejected electron cannot obtain enough drift energy from the laser field to overcome the attractive Coulomb potential of the parental nucleus and thus will eventually populate high-lying Rydberg states [16][17][18]. The underlying physics related to FTI has been explored not only for homonuclear diatomic molecules such as hydrogen [19][20][21][22][23] and nitrogen [24] but also for complex molecular and cluster targets [25][26][27]. There is a certain probability that the excited neutral or charged fragments formed by recapturing of tunneled electrons can be directly detected by the reaction microscope [20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…The underlying physics related to FTI has been explored not only for homonuclear diatomic molecules such as hydrogen [19][20][21][22][23] and nitrogen [24] but also for complex molecular and cluster targets [25][26][27]. There is a certain probability that the excited neutral or charged fragments formed by recapturing of tunneled electrons can be directly detected by the reaction microscope [20][21][22][23][24][25][26][27]. Moreover, the phenomenon of two Rydberg electrons localizing at two nuclear cores has been observed in argon dimer [28].…”

Section: Introductionmentioning

confidence: 99%

Dissociative frustrated multiple ionization of hydrogen chloride in intense femtosecond laser fields

Lin

et al. 2019

Phys. Rev. A

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The dissociative frustrated multiple ionization of hydrogen chloride (HCl) molecules in intense femtosecond laser fields is investigated by employing the coincidence measurement technique in cold target recoil ion momentum spectroscopy. Various dissociative frustrated multiple ionization channels caused by populating one or two electrons to highly excited Rydberg states can be clearly distinguished for HCl in linearly polarized intense laser fields. The excited charged fragmentations, depending on their occupied principle quantum numbers, can be either directly identified forming a "knee" structure in the kinetic energy release spectrum, or singly ionized by the weak electric field in the spectrometer, or by blackbody radiation after the conclusion of the laser pulse. The inherent feature of the potential energy curves of HCl plays an important role in the strong-field dissociative frustrated multiple ionization process.

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Tunneling electron recaptured by an atomic ion or a molecular ion

Cited by 16 publications

References 25 publications

Dissociative Ionization of Argon Dimer by Intense Femtosecond Laser Pulses

Dissociative Ionization of Argon Dimer by Intense Femtosecond Laser Pulses

Frustrated double ionization of atoms in circularly polarized laser fields

Dissociative frustrated multiple ionization of hydrogen chloride in intense femtosecond laser fields

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