Above Threshold Dissociation of Vibrationally Cold<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>HD</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>Molecules

Orr, P.; Williams, Ian D.; Greenwood, J. B.; Turcu, I. C. Edmond; Bryan, William A.; Pedregosa-Gutierrez, Jofre; Walter, C. W.

doi:10.1103/physrevlett.98.163001

Cited by 47 publications

(55 citation statements)

References 25 publications

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“…The ion trap has been briefly reported in an earlier publication (Orr et al 2007) but a more in-depth description is provided here. The instrument operates in a manner analogous to a laser cavity (Pedersen et al 2002, Ota et al 2006, with electrostatic potentials and a linear geometry which preserves the keV beam characteristics of the injected ions.…”

Section: Ion Trapmentioning

confidence: 99%

“…We use HD + rather than H + 2 or D + 2 as it has a permanent dipole moment and will radiatively cool into its ground vibrational state after approximately 300 ms. As the ions are moving in the trap with keV energies, we are also able to study the pure dissociation of the molecular ion through emission of neutral particles, without the interference of any charged fragments produced from the ionization process. A brief report of this method has been previously communicated (Orr et al 2007), in which the above threshold dissociation of HD + (υ = 0) was found to be the dominant dissociation process. This had not previously been observed experimentally as the ground state dissociation was overwhelmed by signal from excited states.…”

Section: Introductionmentioning

confidence: 99%

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Short pulse laser-induced dissociation of vibrationally cold, trapped molecular ions

Alexander

Calvert

King

et al. 2009

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

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An electrostatic trapping scheme for use in the study of light-induced dissociation of molecular ions is outlined. We present a detailed description of the electrostatic reflection storage device and specifically demonstrate its use in the preparation of a vibrationally cold ensemble of deuterium hydride (HD + ) ions. By interacting an intense femtosecond laser with this target and detecting neutral fragmentation products, we are able to elucidate previously inaccessible dissociation dynamics for fundamental diatomics in intense laser fields. In this context, we present new results of intense field dissociation of HD + which are interpreted in terms of recent theoretical calculations.

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Section: Ion Trapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short pulse laser-induced dissociation of vibrationally cold, trapped molecular ions

Alexander

Calvert

King

et al. 2009

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

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“…With the ongoing rapid developments in intense femtosecond (fs) and attosecond (as) laser technologies and some new theoretical and computational approaches in full dimensionality, this simplest molecule, as well as its isotopes HD + and D + 2 , have served as a prime testing ground in recent years to explore fundamental processes such as the electron localization in dissociation channels [4,5], the double-slit interference effect [6][7][8], the mapping of vibrational wave packets followed by Coulomb explosion [9], and above-threshold dissociation [10,11] for laser wavelengths ranging from x-ray to infrared.…”

mentioning

confidence: 99%

Multiphoton ionization of H2+in xuv laser pulses

et al. 2011

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We consider the ionization of the hydrogen molecular ion after one-, two-, and three-photon absorption over a large range of photon energies between 9 and 40 eV in the fixed-nuclei approximation. The temporal development of the system is obtained in a fully ab initio time-dependent grid-based approach in prolate spheroidal coordinates. The alignment dependence of the one-photon ionization amplitude is highlighted in the framework of time-dependent perturbation theory. For one-photon ionization as a function of the nuclear separation, the calculations reveal a significant minimum in the ionization probability. The suppressed ionization is attributed to a Cooper-type minimum, which is similar, but not identical, to the cancellation effect observed in photoionization cross sections of some noble-gas atoms. The effect of the nonspherical two-center Coulomb potential is analyzed. For two-and three-photon ionization, the angle-integrated cross sections clearly map out intermediate-state resonance, and the predictions of the current computations agree very well with those from time-independent calculations. The dominant emission modes for two-photon ionization are found to be very similar in both resonance and off-resonance regions.

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“…The pre-trapping of the ions is combined with a fast pulsing of the beam, both by emptying the trap contents by repeated pulses synchronized with a FLASH pulse train and by pulsing of a directly transported continuous ion beam. In principle, ion trapping directly in the interaction region, as demonstrated for laser multiphoton dissociation of fast molecular ions [29], offers more flexibility and efficiency; however, this technique somewhat compromises the fragment imaging and hence was not implemented in the initial experiments. In test operation, small electrostatic ion traps around the photon crossing have been shown to be operational.…”

Section: Apparatusmentioning

confidence: 99%

Soft-x-ray fragmentation studies of molecular ions

Wolf¹,

Pedersen²,

Lammich³

et al. 2010

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

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Abstract. Imaging of photofragments from molecular ions after irradiation by soft X-ray photons has been realized at the ion beam infrastructure TIFF set up at the FLASH facility. Photodissociation of the two-electron system HeH + at 38.7 eV revealed the electronic excitations and the charge-state ratios for the products of this process, reflecting the non-adiabatic dissociation dynamics through multiple avoided crossings among the HeH + Rydberg potential curves. Dissociative ionization of the protonated water molecules H 3 O + and H 5 O + 2 at 90 eV revealed the main fragmentation pathways after the production of valence vacancies in these ionic species, which include a strong three-body channnel with a neutral fragment (OH + H + + H + ) in H 3 O + photolysis and a significant two-body fragmentation channel (photolysis. The measurements yield absolute cross sections and fragment angular distributions. Increased precision and sensitivity of the technique was realized in recent developments, creating a tool for exploring X-ray excited molecular states under highly controlled target conditions challenging detailed theoretical understanding.

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Above Threshold Dissociation of Vibrationally ColdHD+Molecules

Cited by 47 publications

References 25 publications

Short pulse laser-induced dissociation of vibrationally cold, trapped molecular ions

Short pulse laser-induced dissociation of vibrationally cold, trapped molecular ions

Multiphoton ionization of H2+in xuv laser pulses

Soft-x-ray fragmentation studies of molecular ions

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