Attosecond time delays in the valence photoionization of xenon and iodine at energies degenerate with core emissions

Magrakvelidze, Maia; Chakraborty, Himadri

doi:10.1088/1742-6596/875/3/022015

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…First, the halides F − , Cl − , Br − , and I − are isoelectronic to the well-studied systems of Ne, Ar, Kr, and Xe, respectively, and, hence, they allow for an interesting comparison of two systems where the initial electronic configurations are identical and yet the binding energies significantly differ. Second, it has been shown that in the case of iodine-containing molecules, such as methyl iodide [46], the 4d orbitals of iodide are non-bonding and reasonably agree with the predicted cross-section data of an isolated iodine atom [47,48]. Therefore, comparisons between the Wigner delays in halogen ions and noble gases should help to inform future molecular photoionization studies while also helping to confirm the driving mechanisms behind Wigner time delay phenomena.…”

Section: Introductionmentioning

confidence: 75%

Attosecond Time Delay Trends across the Isoelectronic Noble Gas Sequence

Grafstrom,

Landsman

2023

Atoms

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The analysis and measurement of Wigner time delays can provide detailed information about the electronic environment within and around atomic and molecular systems, with one the key differences being the lack of a long-range potential after a halogen ion undergoes photoionization. In this work, we use relativistic random-phase approximation to calculate the average Wigner delay from the highest occupied subshells of the atomic pairings (2p, 2s in Fluorine, Neon), (3p, 3s in Chlorine, Argon), (4p, 4s, 3d, in Bromine, Krypton), and (5p, 5s, 4d in Iodine, Xenon). The qualitative behaviors of the Wigner delays between the isoelectronic pairings were found to be similar in nature, with the only large differences occurring at photoelectron energies less than 20 eV and around Cooper minima. Interestingly, the relative shift in Wigner time delays between negatively charged halogens and noble gases decreases as atomic mass increases. All atomic pairings show large differences at low energies, with noble gas atoms showing large positive Wigner delays, while negatively charged halogen ions show negative delays. The implications for photoionization studies in halide-containing molecules is also discussed.

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Section: Introductionmentioning

confidence: 75%

Attosecond Time Delay Trends across the Isoelectronic Noble Gas Sequence

Grafstrom,

Landsman

2023

Atoms

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“…Experimentally, photoionization time delays have been measured for Helium [6], noble-gas atoms [7][8][9][10][11], negative ions [12], molecules [13,14], and condensed matter systems [15,16]. Theoretical description often requires an inclusion of many-electron effects for quantitatively accurate calculations [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Various aspects of the time delay in single photon ionization have been studied, such as angular dependence [32][33][34][35], relativistic effects [36], Attochirp effect [37], and time delay in two photon ionization [38].…”

Section: Introductionmentioning

confidence: 99%

Attosecond Time Delay in Photoionization of Noble-Gas and Halogen Atoms

Landsman

2018

Applied Sciences

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Ultrafast processes are now accessible on the attosecond time scale due to the availability of ultrashort XUV laser pulses. Noble-gas and halogen atoms remain important targets due to their giant dipole resonance and Cooper minimum. Here, we calculate photoionization cross section, asymmetry parameter and Wigner time delay using the time-dependent local-density approximation (TDLDA), which includes the electron correlation effects. Our results are consistent with experimental data and other theoretical calculations. The asymmetry parameter provides an extra layer of access to the phase information of the photoionization processes. We find that halogen atoms bear a strong resemblance on cross section, asymmetry parameter and time delay to their noble-gas neighbors. Our predicted time delay should provide a guidance for future experiments on those atoms and related molecules.

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