Laser-induced dissociative recombination of carbon dioxide

In this work, we experimentally study the angle-dependent single ionization of carbon dioxide (CO2) by linearly and circularly polarized pulses. The angle dependence of the ionization probability by linearly polarized pulses extracted from time-domain measurements on an impulsively-excited rotational wave-packet is compared with data obtained from a direct angle-scan measurement. The results from the measurement with linear and circular polarization are consistent with the adiabatic ionization approximation. We extend the time-domain method to extract the dependence of the asymptotic momentum distribution of fragment ions on the orientation of the molecular axis, and apply it to investigate dissociative double ionization of CO2. We show that such measurements can directly test the validity of the axial recoil approximation.

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“…This identification, shown in Fig. 9, is in good agreement with data from coincidence measurements [67].…”

Section: Time-domain Approach Using Orrcssupporting

confidence: 89%

“…In our data, each fragment ion can be selected by putting a gate of 300 ns on the recorded ToA. By doing so, we mostly look at the prompt breakup, but there can still be some contribution from long-lived CO 2+ 2 [67]. The FIG.…”

Section: Time-domain Approach Using Orrcsmentioning

confidence: 99%

Angle-dependent strong-field ionization and fragmentation of carbon dioxide measured using rotational wave packets

et al. 2020

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“…In our experiments, the supersonic expansion of a few bars of argon gas into an ultra-high vacuum chamber produces a dilute gas jet that contains a small fraction (few percent) of vdW-bound argon dimers. The gas jet, propagating along the x-direction of the lab coordinate system, is intersected in the interaction chamber (background pressure < 10 −10 mbar) of a reaction microscope, also applied, e.g., in references [12,23,[43][44][45], with a laser beam propagating along y-direction delivered by a titanium-sapphire multi-pass laser amplifier system, focused onto the gas jet by a spherical mirror with a focal length of 60 mm. The pulses in the beam were linearly polarized along z-direction and had an FWHM duration in intensity of 4.5 fs, a center wavelength λ = 750 nm and a peak intensity, calibrated in in situ [49], of 5 × 10 14 W cm −2 .…”

Section: Methodsmentioning

confidence: 99%

“…It has been shown in many experiments that also this process, the population of Rydberg states, can take place in a strong laser field. In this process, known as frustrated field ionization (FFI), laser field-emitted electrons that have negligible kinetic energy after the completion of the intense laser pulse, become trapped by the attractive Coulomb potential of an atomic or molecular ion [33][34][35][36][37][38][39][40][41][42][43][44][45][46]. In detail, the trapping process not only depends on the energy of the electrons but also on the shape and orientation of their orbits.…”

Section: Introductionmentioning

confidence: 99%

Laser-subcycle control of electronic excitation across system boundaries

Dorner-Kirchner

Erattupuzha

Larimian

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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We report on the results of a joint experimental and numerical study on the sub-cycle laser field-driven electron dynamics that underlie the population of highly excited electronic states in multiply ionized argon dimers by electron recapture processes. Our experiments using few-cycle laser pulses with a known carrier-envelope phase (CEP) in combination with reaction microscopy reveal a distinct CEP-dependence of the electron emission and recapture process and, furthermore, a small but significant CEP-offset to the scenario in which no excited argon dimers are produced. With the help of classical ensemble trajectory simulations we trace down these different CEP-dependencies to subtle differences in the laser-driven sub-cycle electron trajectory dynamics that involve in both cases the transfer of an electron from one argon ion across the system boundary to the neighboring ion and its transient capture on this ion.

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“…It will lead to either stable highlying Rydberg states of C 2 H + 2 or dissociation of C 2 H + 2 . In case of dissociation, the KER will be similar to that from doubly ionized due to the weak screening effect from the high-lying Rydberg electron to the molecular dissociation of C 2 H 2 [23,44]. Therefore, the signals induced by electron recapture have no contribution to the measured dissociation signals of single ionization with a KER less than 2 eV.…”

Section: Laser-induced Electron Excitation Mechanicsmentioning

confidence: 99%

Laser-induced valence electron excitation in acetylene

Hung²,

Larimian³

et al. 2022

Front. Phys.

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Strong-field induced valence electron excitation is a common process in strong field interaction with atoms and molecules. In the case of polyatomic molecules, the effects of ionization from low-lying molecular orbitals and nuclear dynamics during the interaction can play critical roles for electron excitation. In this work, we investigate the involved molecular orbitals in the electron excitation of singly ionized acetylene in a strong laser field using alignment dependence and laser intensity dependence. Additionally, the involved nuclear dynamics during the electron excitation are identified from the difference in the kinetic energy release and the angular distribution of laser-induced dissociation with different pulse durations and intensities. The laser intensity dependence clearly shows the relative strength change of two excitation pathways in the measured momentum and angle-resolved distributions.

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Laser-induced dissociative recombination of carbon dioxide

Cited by 8 publications

References 39 publications

Angle-dependent strong-field ionization and fragmentation of carbon dioxide measured using rotational wave packets

Angle-dependent strong-field ionization and fragmentation of carbon dioxide measured using rotational wave packets

Laser-subcycle control of electronic excitation across system boundaries

Laser-induced valence electron excitation in acetylene

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