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Atoms, Volume 13, Issue 4

2025 April - 12 articles

Cover Story: Water, H2O, is ubiquitous in the Universe, in both the gas and solid phases, and it is the third most abundant molecule after H2 and CO. Its HDO isotopologue is much less (by typically two to five orders of magnitude) but it is also detected in a variety of astrophysical environments, including interstellar and circumstellar regions, planetary and cometary atmospheres. The cross sections and thermally averaged rate coefficients for the vibrational excitation and de-excitation by electron impact on the HDO molecule are computed using a theoretical approach based entirely on first principles. The couplings and transitions between the vibrational states of HDO are accurately accounted for. The H/D isotopic substitution was found to have a large impact in general, so that the rate coefficients for H2O (dashed lines) could not be used reliably for HDO (solid lines) in astrophysical models. View this paper
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Articles (12)

  • Article
  • Open Access
997 Views
18 Pages

18 April 2025

This article presents the maiden investigation of the electronic structural properties of the Sr+ ion confined inside fullerene. The Dirac equations are solved to calculate the energy levels, probability distributions, etc. for various confinement de...

  • Opinion
  • Open Access
961 Views
9 Pages

16 April 2025

Accurate knowledge of the fine structure of low-ionisation-stage heavy elements is crucial for plasma modelling in stellar astronomy, galactic evolution studies, and nucleosynthesis investigations. The experimental determination of atomic energy leve...

  • Article
  • Open Access
915 Views
10 Pages

The Laboratory Measurement of the Line Ratios in X-Ray Emission Resulting from the Charge Exchange Between Mg11+ and Helium

  • Kebao Shu,
  • Caojie Shao,
  • Shuo Zhang,
  • Ruitian Zhang,
  • Cheng Qian,
  • Yingli Xue,
  • Mingwu Zhang,
  • Jinlei Tian,
  • Zhenqiang Wang and
  • Deyang Yu
  • + 3 authors

14 April 2025

The line ratios in X-ray emission resulting from charge exchange between highly charged ions (HCIs) and neutral atoms are not only crucial for accurately modeling astrophysical X-ray emissions but also offer a unique perspective on the charge exchang...

  • Article
  • Open Access
628 Views
9 Pages

9 April 2025

The influence of neutron transfer coupling on surface diffuseness has been thoroughly investigated in the study of carbon-induced fusion reactions. Through analysis of experimental measurements using advanced coupled-channel computational frameworks,...

  • Article
  • Open Access
888 Views
26 Pages

Vibrational Excitation of HDO Molecule by Electron Impact

  • Mehdi Adrien Ayouz,
  • Alexandre Faure,
  • Ioan F. Schneider,
  • János Zsolt Mezei and
  • Viatcheslav Kokoouline

8 April 2025

Cross sections and thermally averaged rate coefficients for the vibrational excitation and de-excitation by electron impact on the HDO molecule are computed using a theoretical approach based entirely on first principles. This approach combines scatt...

  • Article
  • Open Access
756 Views
10 Pages

Photoionization of Trans-Fe Ions: Se IV, Se V, and Se VI

  • Brendan M. McLaughlin,
  • Joern Wilms and
  • James F. Babb

8 April 2025

In the present study, the photoionization cross-sections are calculated for the trans-Fe ions Se IV, Se V, and Se VI over a wide energy region for ground and meta-stable states within the Dirac Atomic R-matrix approach (darc). Our cross-section resul...

  • Article
  • Open Access
1,318 Views
9 Pages

Forced Atom Interferometers in Optical Harmonic Potentials

  • Mingjie Xin,
  • Wui Seng Leong,
  • Zilong Chen and
  • Shau-Yu Lan

3 April 2025

We present a study of Doppler-sensitive light-pulse atom interferometers operating within optical dipole potentials, where atomic trajectories are manipulated using momentum transfer from light pulses and optical forces from the trap. Efficient metho...

  • Article
  • Open Access
947 Views
13 Pages

Electron Scattering from Sevoflurane

  • Savinder Kaur,
  • Ajay Kumar Arora,
  • Kasturi Lal Baluja and
  • Anand Bharadvaja

1 April 2025

Various electron impact scattering cross sections of Sevoflurane are reported up to 5 keV. The elastic cross sections (differential and integral) are computed using the single-centre-expansion formalism within a molecular framework. The ground state...

  • Article
  • Open Access
1 Citations
780 Views
13 Pages

31 March 2025

Intermolecular hydrogen abstraction reactions of radiation-induced radicals from guest molecules in adjacent cages, as observed in clathrate hydrates, were investigated in synthetic silica clathrate (clathrasil) with ethylamine and ethanol. ESR obser...

  • Article
  • Open Access
838 Views
5 Pages

31 March 2025

We revisit the current status of high-precision calculations for electron-impact excitation of the (1s3s)3,1S states in helium in the low-energy near-threshold regime that is characterized by a large number of resonance features. Having noticed discr...

  • Article
  • Open Access
1,473 Views
11 Pages

27 March 2025

Sub-Doppler laser-cooled cesium-133 atoms are utilized as quantum sensors to achieve precise mapping of magnetic fields across a region in ultra-high vacuum (UHV), with a spatial resolution of 1 cm and a sensitivity of approximately 550 pT/√Hz,...

  • Article
  • Open Access
1 Citations
999 Views
26 Pages

25 March 2025

This work addresses closed-form expressions for the distributions P(M) of the magnetic quantum numbers M and Q(J) of total angular momentum J for non-equivalent fermions in single-j orbits. Such quantities play an important role in both nuclear and a...

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Atoms - ISSN 2218-2004