A5006846967- Molecular Spectroscopy and Structure
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Quantum, superfluid, helium dynamics
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Atomic and Subatomic Physics Research
- Various Chemistry Research Topics
- Gas Dynamics and Kinetic Theory
- Heat transfer and supercritical fluids
- Acute Lymphoblastic Leukemia research
- Cold Atom Physics and Bose-Einstein Condensates
- Astro and Planetary Science
- Childhood Cancer Survivors' Quality of Life
- Molecular spectroscopy and chirality
- Fluid Dynamics and Mixing
- Radiation Effects in Electronics
- Health, Environment, Cognitive Aging
- Electrostatic Discharge in Electronics
- Spectroscopy and Chemometric Analyses
- Inorganic Fluorides and Related Compounds
- Microwave and Dielectric Measurement Techniques
- Advancements in Semiconductor Devices and Circuit Design
Laboratoire de Physique des Lasers, Atomes et Molécules
2023-2024
University of Florida
2023-2024
University of South Florida
2022-2024
Centre National de la Recherche Scientifique
2019-2024
UCLouvain
2023-2024
Université de Lille
2023-2024
Université de Rennes
2019-2023
Institut de Physique de Rennes
2018-2023
Children's Hospital of Wisconsin
2023
Medical College of Wisconsin
2023
Experimental studies of the products elementary gas-phase chemical reactions occurring at low temperatures (<50 K) are very scarce, but importance for fundamental reaction dynamics, comparisons with high-level quantum dynamical calculations, and, in particular, providing data modeling cold astrophysical environments, such as dense interstellar clouds, atmospheres outer planets, and cometary comae. This study describes construction testing a new apparatus designed to measure product...
A computational study of O(1D) insertion reactions with methanol (CH3OH), dimethyl ether (CH3OCH3), and methyl amine (CH3NH2) was performed to guide laboratory investigations the product molecules methanediol (HOCH2OH), methoxymethanol (CH3OCH2OH), aminomethanol (HOCH2NH2), respectively. The minimum energy higher conformer geometries products were determined at MP2/aug-cc-pVTZ level theory, CCSD(T)/aug-cc-pVTZ calculations on reactants, products, transitions states examine reaction...
Abstract Spectral line surveys are an indispensable tool for exploring the physical and chemical evolution of astrophysical environments due to vast amount data that can be obtained in a relatively short time. We present deep, broadband spectral 30 interstellar clouds using two λ = 1.3 mm receivers at Caltech Submillimeter Observatory. This information used probe influence environment on molecular complexity. observed wide variety sources examine relative abundances organic molecules as they...
Abstract We use both chirped-pulse Fourier transform and frequency-modulated absorption spectroscopy to study the rotational spectrum of 2-methoxyethanol (CH 3 OCH 2 CH OH) in several frequency regions ranging from 8.7 500 GHz. The resulting parameters permitted a search for this molecule Atacama Large Millimeter/submillimeter Array (ALMA) observations toward massive protocluster NGC 6334I, as well source B low-mass protostellar system IRAS 16293−2422. A total 25 transitions are observed...
The emergence of chemical complexity during star and planet formation is largely guided by the chemistry unstable molecules that are reaction intermediates in terrestrial chemistry. Our knowledge these limited both lack laboratory studies difficulty their astronomical detection. In this work, we focus on weakly bound cluster HO3 as an example connection between spectroscopic study observations. Here, present a fast-sweep technique millimeter submillimeter range to facilitate search for...
We report details of the design and operation a single apparatus that combines Chirped-Pulse Fourier Transform Microwave (CP-FTMW) spectroscopy with vacuum ultraviolet (VUV) photoionization Time-of-Flight Mass Spectrometry (TOFMS). The supersonic expansion used for cooling samples is interrogated first by passing through region between two microwave horns capable broadband excitation detection in 2-18 GHz frequency microwave. After this region, skimmed to form molecular beam, before being...
Using standard hardware available in chirped-pulse Fourier transform microwave (CP-FTMW) spectroscopy, an experimental method is introduced to selectively extract from the spectrum of otherwise complicated multicomponent mixture a set transitions due single component, thereby speeding spectral assignment. The operates broadband used excite sample strong-field limit through combination high power and control sweep rate. A procedure that leads selection three transition frequencies can be...
We present the measurement and analysis of 2OH stretching band methanol between 7165 cm −1 7230 cooled down to 26 ± 12 K in a buffer gas cooling experiment.
We present here the instrument design and first experimental results from a multipass millimeter/submillimeter spectrometer designed to probe dissociative reaction dynamics. This work focuses on benchmarking performance through detection of CH3O H2CO products methanol dissociation induced by high-voltage plasma discharge. Multiple rotational lines were observed when this discharge was applied sample vapor seeded in an argon supersonic expansion. The temperature their abundance with respect...
Methanol (CH3OH) is considered by astronomers to be the simplest complex organic molecule (COM) and has been detected in various astrophysical environments, including protoplanetary disks, comets, interstellar medium (ISM). Studying reactivity of methanol at low temperatures will aid our understanding formation other potentially prebiotic molecules. A major destruction route for many neutral COMs, methanol, via their reactions with radicals such as CN, which ubiquitous space. Here, we study...
Direct absorption spectroscopy has been the mainstay for spectral acquisition in millimeter and submillimeter wavelength regimes because of sensitivity offered by standard hot electron bolometer detectors. However, this approach is limited its utility slow speeds. A few rapid techniques that offer reasonable levels have developed, but these rely on specialized costly equipment. We present here a new instrument design (sub)millimeter spectrometer offers both highly sensitive detection while...
A novel chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer has been constructed to cover the Ka-band (26.5 GHz-40 GHz) for use in CRESUCHIRP project, which aims study branching ratios of reactions at low temperatures using uniform flow technique. The design takes advantage recent developments radio-frequency components, notably, high-frequency, high-power solid-state amplifiers. had a flatness 5.5 dB across spectral range, produced harmonic signals below -20 dBc, and recorded...
The range of spatial displacements over which cyclopean (stereoscopic) apparent motion is perceived was investigated. stimuli were created from retinal disparity embedded in dynamic random-dot stereograms. In one experiment, the displacement for crossed-disparity compared with that luminance-domain motion. results showed about two to three times larger than luminance perceived. a second uncrossed-disparity revealed restricted (motion quality poor) uncrossed relative crossed It inferred...
We present a series of improvements the FANTASIO experimental set-up that couples supersonic expansion to cavity ring-down spectrometer originally reported by M. Herman, et al., Mol. Phys. 105, 815 (2007). In particular, implementation new pulsed slit valve 80 mm in length is detailed. The design based on powerful piezo stack actuator. Schlieren imaging used verify homogeneity molecular beam and quality performance. ability form weakly bound van der Waals complexes assessed using...
Background: The Florida Association of Pediatric Tumor Programs (FAPTP) has used the Statewide Patient Information Reporting System (SPIRS) since 1980 to track all cases pediatric cancer. We reviewed last 40 years SPIRS data see how cancer care evolved. Methods: retrospectively analyzed from through 2020 in 5-year increments, looking at numbers new diagnoses, delivery sites and trial enrollment Children’s Oncology Group (COG) studies. Results: From 1981-2020 Florida’s population increased...
We use both chirped-pulse Fourier transform and frequency modulated absorption spectroscopy to study the rotational spectrum of 2-methoxyethanol in several regions ranging from 8.7-500 GHz. The resulting parameters permitted a search for this molecule Atacama Large Millimeter/submillimeter Array (ALMA) observations toward massive protocluster NGC 6334I as well source B low-mass protostellar system IRAS 16293-2422. 25 transitions are observed ALMA Band 4 data 6334I, first interstellar...
Microwave-millimeter/submillimeter wave double-resonance spectroscopy has been developed with the use of technology typically employed in chirped pulse Fourier transform microwave and fast-sweep direct absorption (sub)millimeter-wave spectroscopy. This technique offers high sensitivity provided by millimeter/submillimeter techniques rapid data acquisition offered spectrometers. Rather than detecting movement population as is observed a traditional experiment, instead we detected splitting...
Understanding conformational preferences of 3- and 4-pentenenitriles<italic>via</italic>broadband microwave spectroscopy.