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Your search keyword '"Hikosaka, Y. (Y.)"' showing total 3 results
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3 results on '"Hikosaka, Y. (Y.)"'

1. Search for the interatomic Auger effect in nitrous oxide

Author

Mailhiot, M. (Maximilian), Hikosaka, Y. (Y.), Jänkälä, K. (Kari), Kivimäki, A. (A.), Küstner-Wetekam, C. (C.), Palaudoux, J. (J.), Pelimanni, E. (Eetu), Penent, F. (F.), Zindel, C. (C.), Patanen, M. (Minna), Lablanquie, P. (P.), Huttula, M. (Marko), Hans, A. (Andreas), Mailhiot, M. (Maximilian), Hikosaka, Y. (Y.), Jänkälä, K. (Kari), Kivimäki, A. (A.), Küstner-Wetekam, C. (C.), Palaudoux, J. (J.), Pelimanni, E. (Eetu), Penent, F. (F.), Zindel, C. (C.), Patanen, M. (Minna), Lablanquie, P. (P.), Huttula, M. (Marko), and Hans, A. (Andreas)

Abstract

The interatomic Auger effect following O 1s ionization in N₂O has been experimentally investigated using multi-electron coincidence spectroscopy. The expected transition energies have been established by comparison to the measured N 1s⁻¹v⁻¹ core-valence double ionization energies. We describe a procedure to eliminate the background of two competing processes contributing spectroscopic signatures to the same energy range, namely double Auger decay of the O 1s vacancy and direct single-photon double ionization into the N 1s⁻¹v⁻¹ states. While the interatomic Auger transitions could not be successfully isolated, we provide an upper boundary of the transition probability of 0.07% with respect to the dominant single Auger decay after O 1s ionization.

Published
2023

2. Auger decay of the 3d hole in the isoelectronic series of Br, Kr⁺, and Rb2⁺

Author

Keskinen, J. (J.), Jänkälä, K. (K.), Aho, S.-M. (S.-M.), Kaneyasu, T. (T.), Hikosaka, Y. (Y.), Shigemasa, E. (E.), Iwayama, H. (H.), Soejima, K. (K.), Ito, K. (K.), Andric, L. (L.), Khalal, M. A. (M. A.), Palaudoux, J. (J.), Penent, F. (F.), and Lablanquie, P. (P.)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics
Abstract

The Auger decay process of the 3d5/2 hole is studied experimentally and theoretically along the isoelectronic Br, Kr⁺, and Rb2⁺ series with electron configuration [Ar] 3d⁹4s²4p⁶. The experimental results consist of multielectron coincidence data measured from all three elements and conventional high-resolution Auger spectrum for the Br case. Theoretical interpretation was done by using multiconfiguration Dirac-Fock calculations. It is found that the decay rate of two-Auger-electron emission increases along the series in the direction of decreasing nuclear charge. Also, complexity of the Auger spectrum follows the same trend, requiring a drastic increase to the size of the configuration space for describing the observed spectra.

Published
2021

3. Core-hole spectator Auger decay

Author

Jänkälä, K. (K.), Lablanquie, P. (P.), Andric, L. (L.), Khalal, M. A. (M. A.), Palaudoux, J. (J.), Penent, F. (F.), Bizau, J.-M. (J.-M.), Cubaynes, D. (D.), Guilbaud, S. (S.), Ito, K. (K.), Bučar, K. (K.), Žitnik, M. (M.), Huttula, M. (M.), Kaneyasu, T. (T.), Hikosaka, Y. (Y.), Jänkälä, K. (K.), Lablanquie, P. (P.), Andric, L. (L.), Khalal, M. A. (M. A.), Palaudoux, J. (J.), Penent, F. (F.), Bizau, J.-M. (J.-M.), Cubaynes, D. (D.), Guilbaud, S. (S.), Ito, K. (K.), Bučar, K. (K.), Žitnik, M. (M.), Huttula, M. (M.), Kaneyasu, T. (T.), and Hikosaka, Y. (Y.)

Abstract

For an atomic state with two electrons missing from different core orbitals one may assume that the deeper hole decays first. However, it is quite probable that the double core-hole state will decay by emission of a slow Auger electron where the deeper core hole remains a spectator, especially if the outer core hole can be filled by Coster-Kronig transition, while the deeper cannot. We study here the competition of both Auger decay channels in a model system, the 1s2s2p⁶(3s/3p) states of Ne⁺ ions. As the phenomenon can take place in any decay chain involving multiple core-excited states it can be critical to understand the ion yields, the electron and x-ray emission spectra, and the molecular fragmentation.

Published
2020

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