Article
Geosciences, Multidisciplinary
Zifan Wang, Haixu Cui, Jingyu Hou, Xiao Dong
Summary: In this study, it was found that HHe+ cannot form under pressure <1000 GPa, but He atoms can provide chemical pressure, leading to the formation of new phases He-2(HF)(4) and He(HF). These compounds exhibit unique structural and electronic configurations, including fundamental planetary materials.
GEOSCIENCE FRONTIERS
(2021)
Article
Optics
Grigory Ya Korenman, Sergey N. Yudin
Summary: The neutralization of excited antiprotonic helium ions accompanied by transitions to lower states during collisions with helium atoms in a low-temperature medium is studied. Shifts in potentials due to antiproton deexcitation energy can lead to significant cross sections of transitions for specific antiproton quantum numbers, increasing the effective annihilation rates of these ions in low-density, low-temperature helium targets.
EUROPEAN PHYSICAL JOURNAL D
(2021)
Article
Multidisciplinary Sciences
Jinping Yao, Luojia Wang, Jinming Chen, Yuexin Wan, Zhihao Zhang, Fangbo Zhang, Lingling Qiao, Shupeng Yu, Botao Fu, Zengxiu Zhao, Chengyin Wu, Vladislav V. Yakovlev, Luqi Yuan, Xianfeng Chen, Ya Cheng
Summary: Quantum coherence plays a crucial role in optical information processing and light manipulation. By using a strong 800 nm femtosecond laser pulse, photon retention and re-emittance can be achieved in a system of coherently excited molecular nitrogen ions. The findings shed light on the nature of coherent quantum control in N thorn 2 and its potential application in optical information storage.
Article
Chemistry, Physical
Saba Zia Hassan, Jonas Tauch, Milaim Kas, Markus Notzold, Roland Wester, Matthias Weidemueller
Summary: The dynamics of detachment loss between rubidium atoms (Rb) and oxygen anions (O-) are studied in a hybrid atom-ion trap. The amount of excited rubidium is actively controlled to tune the electronic quantum state of the system and the anion-neutral interaction dynamics. The detachment induced loss rate is close to zero for ground state Rb interacting with O-, while it is significantly higher for excited state Rb.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Spectroscopy
Zong-Zhan Lu, Pounraj Thanasekaran, Chia-Yuan Huang, Jing-Yun Wu, Tzu-Ting Chang, Wen -Shan Li, Murugesan Velayudham, Kuang-Lieh Lu
Summary: In this study, a neutral rhenium(I)-biimidazole complex was designed and synthesized. The complex was characterized using various spectroscopic techniques and was found to have a relatively simple structure with an octahedral geometry. It showed selective recognition of fluoride ions due to its luminescent characteristics and hydrogen bonding ability.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Biochemistry & Molecular Biology
Massimiliano Bartolomei, Paul Martini, Ricardo Perez de Tudela, Tomas Gonzalez-Lezana, Marta I. Hernandez, Jose Campos-Martinez, Javier Hernandez-Rojas, Jose Breton, Paul Scheier
Summary: Ion yields of He N Ca+ obtained via high-resolution mass spectrometry generally decrease with N, with a more pronounced drop between N = 17 and N = 25, the computed quantum He N Ca+ evaporation energies resembling this behavior. The analysis of the energies and structures reveals that covering Ca+ with 17 He atoms leads to a cluster with one of the smallest energies per atom. As new atoms are added, they continue to fill the first shell at the expense of reducing its stability, until N = 25, which corresponds to the maximum number of atoms in that shell. Behavior of the evaporation energies and radial densities suggests liquid-like cluster structures.
Article
Chemistry, Physical
A. C. LaForge, J. D. Asmussen, B. Bastian, M. Bonanomi, C. Callegari, S. De, M. Di Fraia, L. Gorman, S. Hartweg, S. R. Krishnan, M. F. Kling, D. Mishra, S. Mandal, A. Ngai, N. Pal, O. Plekan, K. C. Prince, P. Rosenberger, E. Aguirre Serrata, F. Stienkemeier, N. Berrah, M. Mudrich
Summary: By using high resolution, time-resolved photoelectron spectroscopy, we have conducted an in-depth study on the ultrafast relaxation processes observed during electronic excitation of helium nanodroplets, revealing relaxation phenomena that were previously unobserved.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Spectroscopy
P. A. S. Randi, D. F. Pastega, M. H. F. Bettega, N. C. Jones, S. V. Hoffmann, S. Eden, A. Souza Barbosa, P. Limao-Vieira
Summary: Absolute cross-section values of gas-phase formic acid in the VUV range have been measured and analyzed, revealing previously unreported vibronic features and active vibrational modes. The photoabsorption measurements also provide information on the photolysis lifetime of formic acid at different altitudes. The combination of experimental and theoretical methods allows for a comprehensive understanding of the electronic transitions and potential energy curves.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Peter M. Felker, Zlatko Bacic
Summary: We introduce a computational methodology that allows rigorous 12D quantum calculations of the vibrational states of hydrogen-bonded trimers. The methodology partitions the vibrational Hamiltonian into two reduced-dimension Hamiltonians, one for intermolecular modes and another for intramolecular vibrations. The calculations reveal significant coupling between intra- and intermolecular vibrational modes in (HF)3.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Gang Meng, Ce Hu, Bin Jiang
Summary: Energy transfer dynamics of highly vibrationally excited NO and CO molecules on a metal surface are strongly correlated with their respective potential energy landscapes. Minor adjustments in the energy landscape near the dissociation barrier can result in dramatic changes in the dynamics, particularly for CO molecules.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
James F. E. Croft, Pablo G. Jambrina, F. Javier Aoiz, Hua Guo, N. Balakrishnan
Summary: This study focuses on the collisions of two D2 molecules prepared in the v = 2 vibrational level and j = 2 rotational level. Quantum calculations were performed to identify key resonance features that contribute to the angular distribution in the experimental results.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Physics, Multidisciplinary
Nikola Vukman, Neven Soic, Martin Freer, Martin Alcorta, Devin Connolly, Petra Colovic, Thomas Davinson, Alessia Di Pietro, Annika Lennarz, Athanasios Psaltis, Chris Ruiz, Milivoj Uroic, Matthew Williams
Summary: An experimental study was conducted to observe the helium-cluster decays of the excited states of Be-12. The study discovered previously reported decays as well as a newly observed decay channel. This experiment provides important supplementary information for understanding the molecular structure of excited states in Be-12.
FRONTIERS IN PHYSICS
(2022)
Article
Chemistry, Physical
Soulef Jellali, Hela Habli
Summary: This paper focuses on the study of molecules such as francium dimer and a comparative spectroscopic investigation of cationic systems Fr-(Ca+, Sr+, Ba+). Computational methods are used to determine relevant parameters and the accuracy and reliability of the results are discussed. The findings provide insights for future laser cooling applications.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Markus Rohdenburg, Ziyan Warneke, Harald Knorke, Maik Icker, Jonas Warneke
Summary: Mass spectrometry can be used to generate and study elusive gas phase ions that cannot be synthesized in solution or bulk. In this study, the reactive fragment anion [B12Br11](-) was generated and converted to [B12Br11N2](-) on surfaces, which has not been synthetically obtained before. The molecular structure of [B12Br11N2](-) was confirmed using conventional methods, and it was found to be stable on surfaces and in solution. Thermal annealing of [B12Br11N2](-) allowed access to the highly reactive intermediate [B12Br11](-), which can be used as a reagent for various chemical transformations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Thermodynamics
Vijay Singh
Summary: The novel two-stage helium buffer gas cooled beam source produces cold molecules efficiently, enabling high precision molecular spectroscopy, investigations of sympathetic cooling of molecules with ultracold atoms, and other applications.