Multiphoton ionization of inner-valence electrons and fragmentation of ethylene in an intense Ti:sapphire laser pulse

Talebpour, A.; Bandrauk, A. D.; Yang, Jingzhao; Chin, S. L.

doi:10.1016/s0009-2614(99)01075-1

Cited by 88 publications

(73 citation statements)

References 18 publications

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“…This allows a clear comparison between experiment and theory without the obscuring effect of averaging over alignments [16]. Experiments also reveal a difference in the ionization from different molecular orbitals reflecting the nodal symmetry of the molecular wave functions [17][18][19][20][21][22][23][24][25][26]. Beyond mere structural effects it is also found that the total ionization yield can be increased by a coherent amplification of lower orbitals [19].…”

Section: Introductionmentioning

confidence: 89%

Time-dependent density-functional study of the alignment-dependent ionization of acetylene and ethylene by strong laser pulses

et al. 2015

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The alignment-dependent ionization of acetylene and ethylene in short laser pulses is investigated in the framework of the time-dependent density-functional theory coupled with Ehrenfest dynamics. The molecular alignment is found to have a substantial effect on the total ionization. Bond stretching is shown to cause an increase of the ionization efficiency, i.e., enhanced ionization, in qualitative agreement with previous theoretical investigations. It is also demonstrated that the enhanced ionization mechanism greatly enhances the ionization from the inner valence orbitals, and the ionization of the inner orbitals is primarily due to their extended weakly bound density tails.

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Section: Introductionmentioning

confidence: 89%

Time-dependent density-functional study of the alignment-dependent ionization of acetylene and ethylene by strong laser pulses

et al. 2015

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“…In addition, the electronic energy levels in molecules can be quite closely spaced such that, within a single-particle picture, ionization may not only take place from the highest occupied molecular orbital (HOMO), but also from lower-lying valence orbitals with a pronounced probability [9][10][11][12][13][14], especially when ionization from the highest-lying states is suppressed by unfavorable orientation of the orbital(s) with respect to the laser polarization direction.…”

Section: Introductionmentioning

confidence: 99%

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

et al. 2014

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We experimentally investigate the ionization mechanism behind the formation of remarkably high charge states observed in the laser-pulse-induced fragmentation of different hydrocarbon molecules by Roither et al. [Phys. Rev. Lett. 106, 163001 (2011)], who suggested enhanced ionization occurring at multiple C-H bonds as the underlying ionization mechanism. Using multiparticle coincidence momentum imaging we measure the yield of multiply charged fragmenting ethylene and acetylene molecules at several intensities and pulse durations ranging from the few-cycle regime to 25 fs. We observe, at constant intensity, a strong increase of the proton energy with increasing laser pulse duration. It is shown that this is caused by a strong increase in the yield of highly charged parent molecular ions with pulse duration. Based on experimental evidence we explain this increase by the necessary population of precursor states in the parent ion that feature fast C-H stretch dynamics to the critical internuclear distance, where efficient ionization via enhanced ionization takes place. For increasing pulse duration these precursor ionic states are more efficiently populated, which leads in turn to a higher enhanced-ionization probability for longer pulses. Our work provides experimental evidence for the existence of a multiple-bond version of enhanced ionization in polyatomic molecules.

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“…Many groups have studied ionization of C 2 H 4 irradiated by an intense femtosecond laser field. Talebpour et al [30] observed strong molecular ions and abundant fragment ions when C 2 H 4 was irradiated by an 800 nm, 200 fs pulse at an intensity of 10 14 W/cm 2 . The abundance of the fragment ions was attributed to the multiphoton ionization of innervalence electrons followed by radiationless transitions to various dissociation channels of the molecular ions.…”

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confidence: 99%

Dynamic alignment of C₂H₄ investigated by using two linearly polarized femtosecond laser pulses

et al. 2006

J. Am. Soc. Mass Spectrom.

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Multiphoton ionization of inner-valence electrons and fragmentation of ethylene in an intense Ti:sapphire laser pulse

Cited by 88 publications

References 18 publications

Time-dependent density-functional study of the alignment-dependent ionization of acetylene and ethylene by strong laser pulses

Time-dependent density-functional study of the alignment-dependent ionization of acetylene and ethylene by strong laser pulses

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Dynamic alignment of C₂H₄ investigated by using two linearly polarized femtosecond laser pulses

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Multiphoton ionization of inner-valence electrons and fragmentation of ethylene in an intense Ti:sapphire laser pulse

Cited by 88 publications

References 18 publications

Time-dependent density-functional study of the alignment-dependent ionization of acetylene and ethylene by strong laser pulses

Time-dependent density-functional study of the alignment-dependent ionization of acetylene and ethylene by strong laser pulses

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Dynamic alignment of C2H4 investigated by using two linearly polarized femtosecond laser pulses

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Product

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Dynamic alignment of C₂H₄ investigated by using two linearly polarized femtosecond laser pulses