Article
Chemistry, Physical
Ming-Ming Zhao, Bin-Bin Wang, Gao-Ren Wang, Bina Fu, Maksim Shundalau, Yong-Chang Han
Summary: By studying the He-4-He-4-Ne-20 collision system, the researchers have calculated the rates for the three-body recombination and collision-induced dissociation processes. It was found that He-4(2) (l = 0) is the dominant product of recombination at ultracold temperatures, with a rate significantly higher than the other three products.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Ritika, T. J. Dhilip Kumar
Summary: In this study, quantum mechanical closed coupling scattering calculations are performed to investigate rotational transitions of C-2 due to collisions with He-3 and He-4. A new C-2-He potential energy surface computed at the CCSD(T)-F12b/aug-cc-pVQZ level of theory is utilized. The results show that the heavier He-4 isotope has a larger rotational quenching cross section compared to the 3He isotope. Wigner's threshold law is observed below 10(-1) cm(-1). The findings suggest that C-2 can be cooled by collisions with He-4 buffer gas.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Optics
T. M. F. Hirsch, D. G. Cocks, S. S. Hodgman
Summary: Researchers identified several Feshbach resonances in collisions of He* and resolved the contradictory results in previous literature. Although these resonances are not currently experimentally usable, an interesting variation in scattering length was observed in heteronuclear collisions under experimentally accessible conditions.
Article
Geochemistry & Geophysics
F. Horton, J. Curtice, K. A. Farley, M. D. Kurz, P. D. Asimow, J. Treffkorn, X. M. Boyes
Summary: The Paleocene basaltic lavas exposed on Baffin Island have the highest He-3/He-4 ratios among terrestrial igneous rocks, potentially containing pristine primordial mantle material. Research findings suggest a common high-He-3/He-4 mantle component shared by Baffin Island and Iceland lavas. The variability in high-He-3/He-4 mantle reservoirs may reflect ancient mantle heterogeneity or helium addition in the upper or lower mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Haoying Pang, Wenfeng Fan, Jiong Huang, Feng Liu, Sixun Liu, Wei Quan
Summary: A highly sensitive in situ magnetic field fluctuation measurement method based on SERF atomic comagnetometer is proposed. Experimental results demonstrate that this method can achieve high-precision measurement of magnetic field fluctuations.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Physics, Condensed Matter
K. Safiullin, V Kuzmin, A. Stanislavovas, E. Alakshin, A. Klochkov, M. Tagirov
Summary: This study reports the first observation of He-3 diffusion anisotropy in He-3-He-4 liquid mixture confined in ordered aerogels at temperatures between 1.5-4.2 K. Various possible mechanisms for the diffusion anisotropy are considered, including Knudsen diffusion, potential anisotropy of layer mode excitations, and helium vortices. The reduced He-3 diffusion in aerogels is suggested to be due to helium excitations at strong confinement conditions, paving the way for future experiments in the crossover regime at lower temperatures.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Astronomy & Astrophysics
Gaoqing Cao
Summary: In this study, we investigate macroscopic transport phenomena in a rotating system in the presence of an external electromagnetic field. By utilizing the lowest Landau level approximation, nontrivial expressions for chiral density and various currents are derived, with Lorentz covariant forms obtained by unifying the results with the magnetovorticity effect.
Article
Astronomy & Astrophysics
Victor E. Ambrus, Radoslaw Ryblewski, Rajeev Singh
Summary: In this study, the propagation properties of spin degrees of freedom were analyzed within the framework of relativistic hydrodynamics. The analytical expression for the spin wave velocity was derived, showing that it approaches half the speed of light in the ultrarelativistic limit. It was found that only the transverse degrees of freedom propagate, similar to electromagnetic waves. Additionally, the effect of dissipative corrections and the damping coefficients for the case of Maxwell-Jüttner statistics were considered.
Article
Physics, Multidisciplinary
Y. Rameshwar, G. Srinivas, D. Laroze, M. A. Rawoof Sayeed, H. P. Rani
Summary: The present study aims to simulate and analyze the Rayleigh-Benard convection of a superfluid mixture (He-3-He-4) kept in a sparsely packed porous medium with stress-free boundary conditions. The linear and nonlinear analysis is conducted near the onset of stationary convection. The flow field and heat transfer characteristics are examined for different control parameters, and a novel flow visualization technique for heat flow patterns is derived.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Xiaopeng Zhang, Wen-Huang Xu, Wenwei Zheng, Sheng-Qun Su, Yu-Bo Huang, Qirui Shui, Tianchi Ji, Mikoto Uematsu, Qian Chen, Masashi Tokunaga, Kaige Gao, Atsushi Okazawa, Shinji Kanegawa, Shu-Qi Wu, Osamu Sato
Summary: In this study, an [FeCo] dinuclear complex exhibiting a magnetic field-induced spin crossover process was obtained, resulting in a significant polarization change of 0.45μC cm(-2). Mössbauer spectroscopy and theoretical calculations revealed that the asymmetric structural change and electron redistribution were responsible for the observed polarization change. This approach provides a new strategy for enhancing the polarization change.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Z. Harutyunyan, Yu. Gasparyan, V. Efimov, S. Krat, A. Umerenkova
Summary: The study investigated helium isotope exchange in tungsten during sequential irradiation by 3 keV 4He and 3He ions at different temperatures. The retention of helium in tungsten was measured using thermal desorption spectroscopy. The results showed efficient isotope exchange even at room temperature, with a faster substitution rate at higher irradiation temperatures. The mechanisms of the observed processes were discussed based on a simple model.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Mar Alonso, Nemesio M. Perez, Pedro A. Hernandez, Eleazar Padron, Gladys Melian, Fatima Rodriguez, German Padilla, Jose Barrancos, Maria Asensio-Ramos, Thrainn Fridriksson, Hirochika Sumino
Summary: This study presents an extensive analysis of helium emissions and thermal energy released from volcanic systems, revealing a direct relationship between diffuse helium emissions and the rise of mantle fluids. These findings are important for inferring the existence of deep and hidden geothermal resources, especially in areas without obvious geothermal manifestations.
Article
Astronomy & Astrophysics
Xiao-Liang Xia, Hui Li, Xu-Guang Huang, Huan Zhong Huang
Summary: This study investigates the spin alignment of vector mesons from locally polarized quarks and anti-quarks in heavy-ion collisions, finding that the observed deviations do not necessarily indicate global polarization but could also stem from local spin alignment induced by local vorticity. Proposed experimental observables can distinguish between local and global spin alignments, offering insights into the patterns of vorticity and the puzzles of phi and K-*0 spin alignments in heavy-ion collisions.
Article
Multidisciplinary Sciences
David Bekaert, Esteban Gazel, Stephen Turner, Mark D. Behn, J. Marten de Moor, Sabin Zahirovic, Vlad C. Manea, Kaj Hoernle, Tobias P. Fischer, Alexander Hammerstrom, Alan M. Seltzer, Justin T. Kulongoski, Bina S. Patel, Matthew O. Schrenk, Saemundur A. Halldorsson, Mayuko Nakagawa, Carlos J. Ramirez, John A. Krantz, Mustafa Yucel, Christopher J. Ballentine, Donato Giovannelli, Karen G. Lloyd, Peter H. Barry
Summary: Mantle plumes are known conduits for upwelling enriched material, but the extent of lateral flow processes dispersing mantle material far from vertical conduits remains unclear. Data from hydrothermal fluids in Central America show high He-3/He-4 values in Panama, likely derived from a Galapagos plume-like mantle infiltrating through a slab window. These findings suggest the potential for lateral mantle flow to transport geochemical heterogeneities over long distances.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
N. Martin, L. J. Bannenberg, M. Deutsch, C. Pappas, G. Chaboussant, R. Cubitt, I Mirebeau
Summary: The study shows that in a series of frustrated amorphous ferromagnets, the morphology of low-temperature field-induced magnetic defects resemble quasi-bidimensional spin vortices, and these defects systematically decrease in size with increasing magnetic field or decreasing the average exchange interaction. They finally disappear in some samples, being replaced by field-induced correlations over finite length scales.
SCIENTIFIC REPORTS
(2021)
Correction
Astronomy & Astrophysics
Otoniel Denis-Alpizar, Thierry Stoecklin
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Daria Jones (nee Burdakova), Gunnar Nyman, Thierry Stoecklin
Summary: In this study, the radiative association of Al+ with H-2 was theoretically investigated using recent potential energy and dipole moment surfaces. The obtained rate coefficients were found to be orders of magnitude larger than previous evaluations based on transition state theory. Comparison with similar systems and discussion on the possible role in the gas phase chemistry of dense molecular clouds were also conducted.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Thierry Stoecklin, Lisan David Cabrera-Gonzalez, Otoniel Denis-Alpizar, Dayan Paez-Hernandez
Summary: In this study, a close coupling approach was used to investigate the bending relaxation of H2O induced by collision with He, taking into account the bending-rotation coupling within the rigid-bender method and using a 4D potential energy surface. The results indicate that the bending-rotation coupling is highly efficient in increasing bending relaxation as the rotational excitation of H2O increases.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Srikanth Korutla, Gregoire Guillon, Pascal Honvault, Tammineni Rajagopala Rao
Summary: The rotational-state resolved integral cross sections and differential cross sections for 18O + 16O16O and 16O + 18O18O reactions were reported, obtained using a time-independent quantum mechanical method on an ab initio potential energy surface of ozone. The isotopic effects were discussed and the results were compared with earlier experimental and theoretical results from the literature.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Franziska Dahlmann, Christine Lochmann, Aravindh N. Marimuthu, Miguel Lara-Moreno, Thierry Stoecklin, Philippe Halvick, Maurice Raoult, Olivier Dulieu, Robert Wild, Stephan Schlemmer, Sandra Bruenken, Roland Wester
Summary: The predissociation spectrum of the Cl-35(-)(H-2) complex was measured in a multipole radiofrequency ion trap at different temperatures using the FELIX infrared free electron laser. Removal of the Cl-(p-H-2) para nuclear spin isomer by ligand exchange to the Cl-(o-H-2) ortho isomer above a certain temperature allows for detecting the spectrum of the more weakly bound complex. Two vibrational bands of Cl-(p-H-2) at 510(1) and 606(1) cm(-1) were detected at trap temperatures of 30.5 and 41.5 K.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Franziska Dahlmann, Pavol Jusko, Miguel Lara-Moreno, Philippe Halvick, Aravindh N. Marimuthu, Tim Michaelsen, Robert Wild, Katharina Geistlinger, Stephan Schlemmer, Thierry Stoecklin, Roland Wester, Sandra Bruenken
Summary: The vibrational predissociation spectra of the CN-H2 and CN-D2 complexes were measured, and strong differences were observed between the spectra of the different nuclear spin isomers. In CN-H2, the dominant bands are due to the hindered rotation of H-2 and CN. In CN-D2, the more stable CN-(p-D-2) isomer contributes to the main observed bands.
Article
Astronomy & Astrophysics
Lisan David Cabrera-Gonzalez, Otoniel Denis-Alpizar, Dayan Paez-Hernandez, Thierry Stoecklin
Summary: This study investigates the bending relaxation of H2O molecule using the rigid-bender close-coupling method. A new potential energy surface is developed from ab initio energies, and the results are compared with other calculation methods. The findings suggest that collision with H is more efficient in causing vibrational quenching of H2O compared to collision with He.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Lisan David Cabrera-Gonzalez, Dayan Paez-Hernandez, Thierry Stoecklin, Otoniel Denis-Alpizar
Summary: The first six-dimensional potential energy surface (PES) for the SiCSi + H-2 complex is developed using ab initio computations and fit to an analytical function. Two similar-depth minima are found at the equilibrium geometry of the SiCSi molecule, and the dependence of the PES on the bending angle is analyzed. A reduced four-dimensional PES averaged over the H-2 orientation is presented. The PES is further used for computing the second virial coefficient of the SiCSi + H-2 pair.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
N. F. Allard, K. Myneni, J. N. Blakely, G. Guillon
Summary: The absorption of alkali resonance lines in ultracool stellar atmospheres and hot exoplanets is severely broadened by collisions with neutral perturbers. In the coolest and densest atmospheres, Na I and K I broadened by molecular hydrogen and helium can dominate the entire optical spectrum. Understanding the effects of Na-He collision broadening is also important for studying the opacity of cool DZ white dwarf stars.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Optics
Lisan David Cabrera-Gonzalez, Ricardo M. Garcia-Vazquez, Dayan Paez-Hernandez, Thierry Stoecklin, Otoniel Denis-Alpizar
Summary: The SiCSi molecule has been detected in the interstellar medium and is important in astrochemistry. Non-local thermodynamic equilibrium models are necessary to determine the physicochemical conditions in molecular clouds. However, there is a lack of rate coefficients for SiCSi, the collision partner with para-H-2(j = 0). This study aims to determine the first set of rotational rate coefficients using quantum dynamics calculations and cross-sections. The findings highlight the need for accurate calculations and provide de-excitation rate coefficients for SiCSi at low temperatures.
EUROPEAN PHYSICAL JOURNAL D
(2023)
Article
Chemistry, Physical
Greigoire Guillon, Maxence Lepers, Anuj Tak, Tammineni Rajagopala Rao, Pascal Honvault
Summary: Full quantum reaction probabilities were reported for the N-15 + (NN)-N-14-N-14 inelastic and reactive collision processes using hyperspherical coordinates and time-independent quantum mechanics. The study focused on the ortho molecular nitrogen species with even rotational quantum number j = 0, 2, ... states. Comparison with previous works using time-dependent wave packet and quasi-classical trajectory methods for N-14 + (NN)-N-14-N-14 fully symmetric collision was provided. Reactive processes involving atom exchange were found to not occur for collision energies below 2.2 eV, while collisions at energies around 2.0 eV were most effective for populating reactants' rovibrational states and those at energies close to 5.0 eV yielded a newly formed (NN)-N-14-N-15 isotopologue in various excited vibrational levels.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Optics
Joshua Forer, Viatcheslav Kokoouline, Thierry Stoecklin
Summary: The role of a large dipole moment in rotating neutral molecules interacting with low-energy electrons is investigated using an accurate ab initio approach. The study successfully reproduces the weakly bound (dipole-bound) states observed in a recent experiment with C3N-. Additionally, the obtained cross section for radiative electron attachment to the C3N molecule, forming the dipole-bound states, is too small to account for its formation in the interstellar medium.
Article
Chemistry, Physical
Gregoire Guillon, Maxence Lepers, Anuj Tak, Tammineni Rajagopala Rao, Pascal Honvault
Summary: This study presents full quantum reaction probabilities for the N-15 + (NN)-N-14-N-14 inelastic and reactive collision processes, computed using hyperspherical coordinates and time-independent quantum mechanics. The results indicate that reactive processes involving atom exchange do not occur for collision energies below 2.2 eV, and collisions at around 2.0 eV are most effective in populating the rovibrational states of the reactants.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Optics
Hamza Labiad, Martin Fournier, Laura A. Mertens, Alexandre Faure, David Carty, Thierry Stoecklin, Piotr Jankowski, Krzysztof Szalewicz, Sebastien D. Le Picard, Ian R. Sims
Summary: Experimental measurements and theoretical calculations of rotational energy transfer of CO in collision with H-2 in very low temperatures prevailing in dense interstellar clouds (5-20 K) are reported. The detailed agreement between quantum state-selected experiments performed in cold supersonic flows using time-resolved infrared-vacuum-ultraviolet double-resonance spectroscopy and close-coupling quantum scattering calculations confirms the validity of the calculations for collisions between the two most abundant molecules in the interstellar medium.
Correction
Astronomy & Astrophysics
Maxence Lepers, Gregoire Guillon, Pascal Honvault
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
