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Exploring low barrier quantum tunneling and structural planarity in 3-methylstyrene conformers: Insights from microwave spectroscopy.
J Chem Phys
January 2025
Department of Chemistry, Tennessee Tech University, Cookeville, Tennessee 38505, USA.
The first ground-state rotational spectrum of 3-methylstyrene (3MS) was measured by Fourier transform microwave spectroscopy under supersonic jet-cooled conditions. Transitions were assigned for two conformers: cis-3MS and trans-3MS. In the cis conformer, the vinyl group is oriented toward the methyl group, while in the trans conformer, it is positioned away from the methyl.
View Article and Find Full Text PDFProgress in understanding the infrared spectrum of the H2O-O2 dimer.
J Chem Phys
January 2025
Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada.
Spectra of the weakly bound H2O-O2 dimer are studied in the region of the H2O ν2 band using a tunable quantum cascade laser to probe a pulsed supersonic slit jet expansion. These are the first gas-phase infrared spectra of H2O-O2 and among only a few such results for O2-containing complexes. Almost 100 infrared lines are assigned based on the ground state combination differences from the microwave spectrum of H2O-O2.
View Article and Find Full Text PDFFirst clinical utility of sensing Ultrasound Localization Microscopy (sULM): identifying renal pseudotumors.
Theranostics
January 2025
Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale, Paris, France.
Renal pseudotumors, which mimic tumors on imaging, pose diagnostic challenges that can lead to unnecessary interventions. Sensing ultrasound localization microscopy (sULM) is an advanced imaging technique that uses ultrasound imaging and microbubbles as sensors to visualize kidney functional units. This study aims to investigate whether sULM could differentiate between renal pseudotumors and tumors based on the presence of glomeruli.
View Article and Find Full Text PDFThermally Initiated Formation of Criegee Intermediate CHOO in the Oxidation of Ethane.
J Phys Chem Lett
December 2024
Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
Criegee intermediates (CIs) play an important role in atmospheric chemistry as a transient source of the OH radical through their formation by the ozonolysis of unsaturated organic compounds. Here, we report thermally initiated formation of the smallest CI (CHOO) in the oxidation of ethane (CHCH) that may be relevant to combustion and flames. The SiO/SiC oxidation microreactor is heated to 1800 K and has a short residence time of ∼100 μs.
View Article and Find Full Text PDFProduct branching in the photodissociation of oxazole detected by broadband rotational spectroscopy.
Phys Chem Chem Phys
November 2024
Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA.
The photodissociation of oxazole (c-CHNO) following excitation at 193 nm is studied using mm-Wave rotational spectroscopy in a uniform supersonic flow. Molecules entrained in the flow are excited to a ππ* state after which it is believed most relax back to the ground state ring opening at the O-C[N] bond with subsequent fragmentation. From the line intensities of the probed products, we obtained the branching fractions for seven different products which are the result of five different dissociation pathways.
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