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Infrared Laser Stark Spectroscopy of Methyl Fluoride in He Nanodroplets.
Chemphyschem
June 2024
Department of Chemistry, University of Georgia, Athens, GA, 30602, United States.
We measured the rotationally resolved infrared spectra of helium solvated methyl fluoride at 3 μm and 10 μm, wherein lies C-H and C-F stretching bands, respectively. The linewidths (FWHM) were found to increase with increasing vibrational energy and range from 0.002 cm in the v band (C-F stretch) at ~1047 cm, to 0.
View Article and Find Full Text PDFGiant magnetocaloric effect in spin supersolid candidate NaBaCo(PO).
Nature
January 2024
CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijng, China.
Supersolid, an exotic quantum state of matter that consists of particles forming an incompressible solid structure while simultaneously showing superfluidity of zero viscosity, is one of the long-standing pursuits in fundamental research. Although the initial report of He supersolid turned out to be an artefact, this intriguing quantum matter has inspired enthusiastic investigations into ultracold quantum gases. Nevertheless, the realization of supersolidity in condensed matter remains elusive.
View Article and Find Full Text PDFAggregation of solutes in bosonic versus fermionic quantum fluids.
Sci Adv
December 2021
Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA.
Quantum fluid droplets made of helium-3 (He) or helium-4 (He) isotopes have long been considered as ideal cryogenic nanolabs, enabling unique ultracold chemistry and spectroscopy applications. The droplets were believed to provide a homogeneous environment in which dopant atoms and molecules could move and react almost as in free space but at temperatures close to absolute zero. Here, we report ultrafast x-ray diffraction experiments on xenon-doped He and He nanodroplets, demonstrating that the unavoidable rotational excitation of isolated droplets leads to highly anisotropic and inhomogeneous interactions between the host matrix and enclosed dopants.
View Article and Find Full Text PDFWhat does engagement mean to participants in longitudinal cohort studies? A qualitative study.
BMC Med Ethics
June 2021
School of Social and Political Sciences, University of Glasgow, Adam Smith Building, Bute Gardens, Glasgow, G12 8RT, UK.
Background: Engagement is important within cohort studies for a number of reasons. It is argued that engaging participants within the studies they are involved in may promote their recruitment and retention within the studies. Participant input can also improve study designs, make them more acceptable for uptake by participants and aid in contextualising research communication to participants.
View Article and Find Full Text PDFThe relation of geogenic contaminants to groundwater age, aquifer hydrologic position, water type, and redox conditions in Atlantic and Gulf Coastal Plain aquifers, eastern and south-central USA.
Sci Total Environ
June 2020
U.S. Geological Survey, New Jersey Water Science Center, 3450 Princeton Pike, Suite 110, Lawrenceville, NJ 08648, United States.
Groundwater age distributions developed from carbon-14 (C), tritium (H), and helium-4 (He) concentrations, along with aquifer hydrologic position, water type, and redox conditions, were compared to geogenic contaminants of concern (GCOC) from 252 public-supply wells in six Atlantic and Gulf Coastal Plain unconsolidated-sediment aquifers. Concentrations of one or more GCOCs in 168 (67%) wells exceeded MCLs (maximum contaminant levels), SMCLs (secondary MCLs), or HBSLs (health-based screening levels). Human-health benchmark thresholds (MCLs or HBSLs) were exceeded in 31 (12%) wells, and included 0.
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