Structure Effects in Angle-Resolved High-Order Above-Threshold Ionization of Molecules

Kang, Hongwei; Quan, Wei; Wang, Y.; Lin, Zhiping; Wu, Mei‐Hwan; Liu, H.; Liu, Xin; Wang, B. B.; Liu, H. J.; Gu, Yuming; Jia, Xiaoli; Liu, J.; Chen, J.; Cheng, Ya

doi:10.1103/physrevlett.104.203001

Cited by 63 publications

(32 citation statements)

References 27 publications

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“…[10][11][12][13]. It has also been shown that structural information of the target can be retrieved using short light pulses [14,15].…”

Section: Introductionmentioning

confidence: 99%

Forward-backward asymmetry of photoemission inC60excited by few-cycle laser pulses

Gao¹,

Dinh²,

Reinhard³

et al. 2017

Phys. Rev. A

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We theoretically analyze angle-resolved photo-electron spectra (ARPES) generated by the interaction of C60 with intense, short laser pulses. In particular, we focus on the impact of the carrier-envelope phase (CEP) onto the angular distribution. The electronic dynamics is described by time-dependent density functional theory, and the ionic background of C60 is approximated by a particularly designed jellium model. Our results show a clear dependence of the angular distributions onto the CEP for very short pulses covering only very few laser cycles, which disappears for longer pulses. For the specific laser parameters used in a recent experiments, a very good agreement is obtained. Furthermore, the asymmetry is found to depend on the energy of the emitted photoelectrons. The strong influence of the angular asymmetry of electron emission onto the CEP and pulse duration suggests to use this sensitivity as a means to analyze the structure of few-cycle laser pulses.

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“…[10][11][12][13]. It has also been shown that structural information of the target can be retrieved using short light pulses [14,15].…”

Section: Introductionmentioning

confidence: 99%

Forward-backward asymmetry of photoemission inC60excited by few-cycle laser pulses

Gao¹,

Dinh²,

Reinhard³

et al. 2017

Phys. Rev. A

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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%

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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“…From an experimental point of view, ZWRs have already been exploited for the interpretation of spectral data concerning the predissociation of IBr [27]. To the best of our knowledge, although EPs have not yet been used in experimental works involving molecular systems, they have recently been directly observed in an open quantum composite of a single atom and a high-Q cavity mode [28].…”

Section: Introductionmentioning

confidence: 99%

Laser cooling of the vibrational motion of Na2combining the effects of zero-width resonances and exceptional points

et al. 2011

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We propose various scenarios for molecular vibrational cooling combining the effects of two kinds of resonance states occurring during the photodissociation of Na 2 taken as an illustrative example. Such resonances result from an appropriate sampling of laser parameters (wavelength and intensity): (a) For particular choices of intensity and wavelength, two resonance energies can be brought to complete coalescence, with their positions and widths becoming equal and leading to a so-called exceptional point (EP) in the parameter plane. Advantage can be taken from such points for very selective laser-controlled vibrational transfer strategies. (b) For specific intensities, far beyond the perturbation regime, some resonances can have a zero width (infinite lifetime). They are referred to as a zero-width resonance (ZWR) and may be used for vibrational purification purposes. We show how appropriately shaped, experimentally reachable laser pulses, encircling EPs or inducing ZWRs, may be used for a thorough and comprehensive control aiming at population transfer or purification schemes, which, starting from an initial field-free vibrational distribution, ends up in the ground vibrational level.

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Structure Effects in Angle-Resolved High-Order Above-Threshold Ionization of Molecules

Cited by 63 publications

References 27 publications

Forward-backward asymmetry of photoemission inC60excited by few-cycle laser pulses

Forward-backward asymmetry of photoemission inC60excited by few-cycle laser pulses

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

Laser cooling of the vibrational motion of Na2combining the effects of zero-width resonances and exceptional points

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