The HIFI instrument aboard the Herschel satellite has allowed the observation and characterization of light hydrides, the building blocks of interstellar chemistry. In this article, we revisit the ortho/para ratio for H2O(+) toward the Sgr B2(M) cloud core. The line of sight toward this star forming region passes through several spiral arms and the gas in the Bar potential in the inner Galaxy. In contrast to earlier findings, which used fewer lines to constrain the ratio, we find a ratio of 3, which is uniformly consistent with high-temperature formation of the species. In view of the reactivity of this ion, this matches the expectations.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jp312364c | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ortho-Para Conversion for H + H Collision in Low Temperature: A Fully Close-Coupled Time-Dependent Wave Packet Study.
J Phys Chem A
October 2024
School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, P. R. China.
The collision-induced rate coefficients of ortho-para conversion for the H + H reaction provide accurate information to probe the lifetime of cold environments in interstellar media. Rotationally resolved reaction probabilities are calculated at the low collision energy regime (0 < ≤ 0.3 eV) by employing the coupled three-dimensional (3D) time-dependent wave packet (TDWP) formalism in hyperspherical coordinates on a recently constructed ab initio ground adiabatic potential energy surface of H [ , , 204306] for the process H + H ( = 0, = 0-5) → H + H (' = 0, ').
View Article and Find Full Text PDFOrtho to para hydrogen conversion over bimetallic iron and cobalt catalysts.
Sci Rep
September 2024
Faculty of Maritime and Transportation, Ningbo University, Ningbo, 315211, People's Republic of China.
The catalytic conversion of ortho-hydrogen (o-H) to para-hydrogen (p-H) serves as a crucial step in the storage of liquid hydrogen. A variety of iron-cobalt bimetallic catalysts (FCO) were synthesized using a precipitation method, incorporating diverse levels of Co doping into Fe-based catalysts. The effects of Co doping on the crystal structure, porosity, and magnetism of FCO catalysts were studied by XRD, N physical adsorption, FTIR, XPS, and VSM analyses.
View Article and Find Full Text PDFEvaporation of water and urea solution in a magnetic field; the role of nuclear isomers.
J Colloid Interface Sci
January 2023
School of Physics, Trinity College, Dublin 2, Ireland. Electronic address:
Hypothesis: Ortho and para water are the two nuclear isomers where the hydrogen protons align to give a total nuclear spin of 1 or 0. The equilibrium ratio of 3:1 is established slowly in freshly evaporated water vapour while the isomers behave distinct gasses, with their own partial pressures. Magnetic-field-induced ortho ⟷ para transformations are expected to alter the evaporation rate.
View Article and Find Full Text PDFElectronic spectroscopy of Mg-phthalocyanine embedded in cold hydrogen clusters produced by a pulsed nozzle.
J Chem Phys
July 2021
Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
Cold clusters of molecular hydrogen were created using a pulsed nozzle. The thermodynamical states of the clusters were characterized by measuring the cluster beam velocity and the laser-induced fluorescence (LIF) spectra of embedded molecules. Two distinct velocity components were identified in the beam that originates from different clustering mechanisms.
View Article and Find Full Text PDFPreparation of Lignin-Based High-Ortho Thermoplastic Phenolic Resins and Fibers.
Molecules
June 2021
Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, College of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China.
Surplus lignin, which is inefficiently used, is generated in the forestry industry. Currently, most studies use lignin instead of phenol to synthesize thermosetting resins which cannot be reprocessed, thus affecting its application field. Thermoplastic phenolic resin has an orderly structure and excellent molding performance, which can greatly improve its application field and economic value.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!