AI Article Synopsis
- The study examined the rotational spectrum of the dimethylsilane-argon molecular complex using advanced spectroscopy techniques.
- The lowest energy state occurs when the argon atom is positioned in line with the molecular symmetry of dimethylsilane, slightly tilted from the silicon atom.
- Measurements indicated a small energy splitting caused by the argon atom's tunneling motion and the rotation of the attached methyl groups, aiding in mapping the potential energy landscape of the system.
Article Abstract
The rotational spectrum of the molecular complex dimethylsilane-argon was investigated by free-jet absorption millimeter-wave and molecular-beam Fourier transform spectroscopy. The absolute energy minimum corresponds to a conformation in which the argon atom lies in the plane of symmetry of dimethylsilane, perpendicular to the C-Si-C plane. The distance of Ar atom is tilted 14 degrees away from the Si atom. The zero-point dissociation energy was estimated from the centrifugal distortion constant D(J) to be 2.2 kJ mol(-1). Small splitting, due to tunneling of the Ar atom and internal rotation of the two methyl groups, was observed, measured, and used to determine the potential energy surface for these motions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/cphc.200400191 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
In this paper, an optically transparent dual-band microwave chiral metamaterial based on indium tin oxide (ITO) strips is proposed. The rotation angle and length of the three ITO strips on the structural layer can be varied to generate two independent frequency bands in the circular dichroism (CD) spectrum. The maximum CD value is 0.
View Article and Find Full Text PDFH*10 neutron dosimetry (unlike gamma dosimetry), requires consideration of neutron energy spectra due to the 20× variation of the weight factor over the thermal-to-fast energy range, as well as the neutron radiation field dose rates ranging from cosmic, ~.01 μSv h-1 levels to commonly encountered ~10-200 μSv h-1 in nuclear laboratories/processing plants, and upwards of 104 Sv h-1 in nuclear reactor environments. This paper discusses the outcome of the comparison of spectrum-weighted neutron dosimetry covering thermal-to-fast energy using the novel H*-TMFD spectroscopy-enabled sensor system in comparison with measurements using state-of-the-art neutron dosimetry systems at SRNS-Rotating Spectrometer (ROSPEC), and non-spectroscopic Eberline ASP2E ("Eberline") and Ludlum 42-49B ("Ludlum") survey instrumentation.
View Article and Find Full Text PDFRedefining superior escape of the humeral head: A radiographic and magnetic resonance imaging study.
Shoulder Elbow
January 2025
Department of Orthopaedic Surgery, Tauranga Hospital, Tauranga, New Zealand.
Background: The underlying shoulder pathology in radiographic superior escape of the humeral head and association between acromiohumeral interval (AHI) on radiographs and magnetic resonance imaging (MRI) are poorly understood.
Methods: A retrospective review of shoulder radiographs and MRI scans was undertaken. AHI was measured using both modalities.
Broad-spectrum applications of plant growth-promoting rhizobacteria (PGPR) across diverse crops and intricate planting systems.
Microbiol Spectr
January 2025
College of Resources and Environment, Henan Agricultural University, Zhengzhou, China.
Multifunctional plant growth-promoting rhizobacteria (PGPR) have garnered significant attention in agricultural applications; however, a few have applied them in crop rotation or intercropping fields. To identify PGPR with strong colonization ability and broad spectrum benefit, we screened strains from the local tobacco rhizosphere and evaluated their growth-promoting effects across various crops and farming systems. In this study, strain L8, identified as , was selected as a multifunctional PGPR capable of producing indole-3-acetic acid (IAA), solubilizing potassium, and mobilizing both organic and inorganic phosphorus.
View Article and Find Full Text PDFExploring 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 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!