Resonant-Auger-state-selected dissociation dynamics and dissociation limits of N 1s→π* core excited N2 molecules studied using a two-dimensional Auger-electron-photoion coincidence method

Iwayama, H.; Harries, James

doi:10.1016/j.elspec.2019.01.005

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…It is interesting that approximately 40 % of the RDA processes result in the unbalanced-charge separation into N 2+ + N irrespective of the resonant excitations. From the discrepancy in (RDA) between the previous 8 and the present results discussed above, such unbalanced-charge dissociation from the 1s → π * core-excited state would accompany the emission of Auger electron in the range < 345 eV . The correlations between the electronic relaxation processes and the ion fragmentation channels can be precisely investigated with an electron -ion coincidence technique, which was demonstrated for the single Auger decay of the 2p → σ * core-excited states of chlorometanes 27 .…”

Section: Please Cite This Article As Doi:101063/15142587contrasting

confidence: 93%

“…The obtained values are shown in table 2. The branching ratio of the RDA decays for the 1s → π * resonant excitation (30 ± 3 ) does not agree with previous value (19 ± 3 ) estimated by the Auger electron-ion(s) coincidence experiment 8 . In the previous measurement, Auger electrons in the limited kinetic energy range (345 ≤ ≤ 390 eV) were collected and as a result the contribution from the N 2+ + N decay channel (channel (5) in table 2) accompanied with the emission of Auger electron in the range < 345 eV was excluded.…”

Section: Branching Ratio Of Decays After the Core Excitationcontrasting

confidence: 80%

“…They revealed that the ion branching ratio at the π * resonance is considerably different from that above the ionization threshold. Iwayama and Harries 8 recently performed Auger electron -ion coincidence measurements and obtained the spectra of Auger electrons tagged with the production of N 2 + and N + /N 2 2+ from the π * resonance.…”

Section: Introductionmentioning

confidence: 99%

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Multiple Auger decays of core-excited states in N2

Odagiri

Taniguchi

Kaneyasu

et al. 2020

The Journal of Chemical Physics

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Multi-electron coincidence measurements have been performed at the photon energies for the core-to-valence ( 1s → π * ) and core-to-Rydberg ( 1s → 3sσ and 3pπ ) resonant excitations in N 2 , in order to investigate the dynamics of multiple Auger-electron emissions from these core-excited states in detail. Peaks due to slow electrons from superexcited atomic fragments are observed in the decay processes by emission of 2 or 3 Auger electrons, indicating stepwise (cascade) multiple Auger decays that involve faster dissociations than electronic relaxations. Energy partitions between the emitted electrons enable us to reveal the detailed decay mechanisms for these processes.Branching ratios among the decays by emission of 1, 2 or 3 Auger electrons and those between the simultaneous (direct) and stepwise (cascade) processes have been determined for each of the core excited states. Branching ratios of decay channels resulting in molecular or fragment ions have also been substantiated.

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Section: Please Cite This Article As Doi:101063/15142587contrasting

confidence: 93%

Section: Branching Ratio Of Decays After the Core Excitationcontrasting

confidence: 80%

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Multiple Auger decays of core-excited states in N2

Odagiri

Taniguchi

Kaneyasu

et al. 2020

The Journal of Chemical Physics

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Visualize the vibronic coupling in Auger final states in N2 molecule

Huang

Ding

Feng

et al. 2023

The Journal of Chemical Physics

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Vibronic coupling is a critical mechanism in chemical reactions. However, its quantitative evaluation is challenging due to mathematical complexity and programming difficulty, and its experimental proof is often elusive due to overlap among neighboring states. Here, after exciting a vibrational level (ν = 0, 1, 2) of the intermediate N 1s→πg* core-excited state in N2 molecules, we separate the resonant Auger decay channels that lead to the lowest dissociation limit in the two-dimensional energy correlation maps. From three kinetic energy release spectra of these channels at different vibrational quantum numbers, we give the first experimental proof of the vibronic coupling between two resonant Auger final states 12Πg and 22Πg.

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