Heavy Rydberg states: large amplitude vibrations

Kirrander, Adam; Jungen, Ch.; Donovan, Robert J.; Lawley, Kenneth P.

doi:10.1039/c8fd00096d

Cited by 3 publications

(1 citation statement)

References 60 publications

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“…Lastly, it is challenging for the community to determine the exact nature of the non-linearity to evaluate the time to the z-momentum scale factor. The predissociation process confirmed in IPD dynamics will open fascinating properties to study heavy, and ultralong Rydberg system [33][34][35]. We illustrate the employment of a three-dimensional (x,y,t) MCP-Delay Line coupled detection system that can be implemented in all sorts of ion imaging in which inversion techniques are unfeasible, i.e., the breakdown of axial symmetry [36].…”

Section: Discussionmentioning

confidence: 99%

Effect of slicing in velocity map imaging for the study of dissociation dynamics

Kundu¹,

Biswas²,

Vikrant³

et al. 2021

Preprint

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Inelastic collision dynamics between isolated gas-phase carbon monoxide molecules and low energetic electrons (< 50 eV) has been studied using state-of-the-art velocity map imaging apparatus and reported previously [1,2]. These were based on data analysis using the time-gated parallel slicing technique, which has recently revealed the drawback of lower momentum ion exaggeration mainly due to the inclusion of whole Newton sphere's of diameter ≤ parallel slicing time window. To overcome this drawback, we report implementing a wedge slicing technique so that every momentum sphere contributes equally to the statistics. We also present a comparative study between these two techniques by reanalyzing the data using the time-gated parallel slicing technique. Unlike parallel slicing, the wedge slicing technique better represents the dissociation dynamics, particularly for the ions with low kinetic energy.

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Section: Discussionmentioning

confidence: 99%

Effect of slicing in velocity map imaging for the study of dissociation dynamics

Kundu¹,

Biswas²,

Vikrant³

et al. 2021

Preprint

View full text Add to dashboard Cite

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Breakdown of dipole Born approximation and the role of Rydberg’s predissociation for the electron-induced ion-pair dissociation to oxygen in the presence of background gases

Kundu

Vikrant

Nandi

2023

The Journal of Chemical Physics

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We study the electron-induced ion-pair dissociation to gas-phase oxygen molecules using a state-of-the-art velocity-map ion-imaging technique. The analysis is entirely based on the conical time-gated wedge-shaped velocity slice images of O−/O2 nascent anionic fragments, and the resulting observations are in favor of Van Brunt et al.’s report [R. J. Van Brunt and L. J. Kieffer, J. Chem. Phys. 60, 3057 (1974)]. A new image reconstruction method, Jacobian over parallel slicing, is introduced to overcome the drawback of ion exaggeration in determining the kinetic energy distribution from the time-gated parallel slicing technique, which offers an alternative approach to the wedge slicing method. Most importantly, the role of the quintet-heavy Rydberg state has been drawn out to the complex ion-pair formalism. The extracted kinetic energy and angular distributions from the wedge slice images reveal a high momentum transfer during the ion-pair dissociation process, which could be the finest rationale to observe the breakdown of dipole Born approximation driven by multipole moment associated with the incident electron beam. Three distinct dissociative momentum bands have been precisely identified for O− dissociation. However, radiationless Rydberg’s predissociation continuum (≥15%) has become an inherent character of electron-induced ion-pair dissociation, which could be dealt with using the beyond Born–Oppenheimer treatment. The incoherent sum of Σ and Π symmetric-associated ion-pair final states has been precisely identified by modeling the angular distribution of O−/O2 for each of the kinetic energy bands. A negligibly small amount of forward–backward asymmetry is observed in the angular distribution of O−/O2, which might be explained by the dissociative state-specific quantum coherence mechanism as reported [Krishnakumar et al., Nat. Phys. 14, 149 (2018); Kumar et al., arXiv:2206.15024 (2022)] by Prabhudesai et al.

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