A5103224252- Analytical chemistry methods development
- Mass Spectrometry Techniques and Applications
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Advanced Chemical Sensor Technologies
- Electrochemical Analysis and Applications
- Quantum and electron transport phenomena
- Muon and positron interactions and applications
- Radiation Effects in Electronics
- Analytical Chemistry and Chromatography
- Toxic Organic Pollutants Impact
- Integrated Circuits and Semiconductor Failure Analysis
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Chemical Physics Studies
- Superconducting and THz Device Technology
- Advanced Proteomics Techniques and Applications
- Atmospheric Ozone and Climate
- Advanced Semiconductor Detectors and Materials
- Ionic liquids properties and applications
- Space Exploration and Technology
Pacific Northwest National Laboratory
2019-2024
Queen's University
2020
Richland College
2020
Abstract The nEXO neutrinoless double beta (0 νββ ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon search for the in 136 Xe. Progress detector design, paired with higher fidelity its simulation an advanced data analysis, based on one used final results EXO-200, produce sensitivity prediction that exceeds half-life 10 28 years. Specifically, improvements have been made understanding production scintillation photons charge as...
Understanding the reactivity of metal cations with various reaction gases in inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) is important to determine best gas use for a given analyte/interference pair. In this study, nitric oxide (NO) was investigated as following previous experimental designs. The reactions 50 elements were examine periodic trends reactivity, validate theoretical modeling enthalpies method screen reactant gases, and provide baseline data set potential...
Carbon dioxide (CO 2 ) was used as a reaction gas to investigate the gas‐phase ion‐molecule interactions using Agilent 8900 ICP‐MS/MS. A solution containing forty‐five elements representative of periodic table supply ions react with CO in collision/reaction cell (CRC). The only significant product formed were monoxides. general reactivity shown be consistent density functional theory (DFT)‐predicted enthalpies, such that all predicted exothermic reactions produced at levels least 1%...
A mass shift method using ICP-MS/MS with O<sub>2</sub> reaction gas is used for ultra-trace determinations of U and Th in samples containing W, Ir, Pt, Au derived polyatomic interferants without the need extensive chemical sample preprocessing.
Reactions of CO2 with Th+ have been studied using guided ion beam tandem mass spectrometry (GIBMS) and An+ (An+ = Th+, U+, Pu+, Am+) triple quadrupole inductively coupled plasma (QQQ-ICP-MS). Additionally, the reactions ThO+ + CO were examined GIBMS. Modeling kinetic energy-dependent GIBMS data allowed determination bond dissociation energies (BDEs) for D0(Th+-O) D0(OTh+-O) that are in reasonable agreement previous measurements. The QQQ-ICP-MS at higher pressures where multiple collisions...
Abstract Ionizing radiation has been shown to reduce the performance of superconducting quantum circuits. In this report, we evaluate expected contributions different sources ambient radioactivity for typical qubit experiment platforms. Our assessment inside a cryostat highlights importance selecting appropriate materials components nearest devices, such as packaging and electrical interconnects. We present shallow underground facility (30-meter water equivalent) flux cosmic rays lead...
Silicon photomultipliers are regarded as a very promising technology for next-generation, cutting-edge detectors low-background experiments in particle physics. This work presents systematic reflectivity studies of Photomultipliers (SiPM) and other samples liquid xenon at vacuum ultraviolet (VUV) wavelengths. A dedicated setup the University Münster has been used that allows to acquire angle-resolved reflection measurements various immersed with 0.45° angular resolution. Four investigated...
Ionizing radiation has been shown to reduce the performance of superconducting quantum circuits. In this report, we evaluate expected contributions different sources ambient radioactivity for typical qubit experiment platforms. Our assessment inside a cryostat highlights importance selecting appropriate materials components nearest devices, such as packaging and electrical interconnects. We present shallow underground facility (30-meter water equivalent) flux cosmic rays lead shielded abate...
It is of great importance to develop a photodetector system with an ultralow radioactivity background in rare event searches. Silicon photomultipliers (SiPMs) and application-specific integrated circuits (ASICs) are two ideal candidates for low photosensors readout electronics, respectively, because they mainly composed silicon, which can achieve good radio-purity without considerable extra effort. However, interposers, used provide mechanical support signal routes between the photosensor...
New Experiments with Spheres-Gas (NEWS-G) is a dark matter direct detection experiment that will operate at SNOLAB (Canada). Similar to other rare-event searches, the materials used in detector construction are subject stringent radiopurity requirements. The features 140-cm diameter proportional counter comprising two hemispheres made from commercially sourced 99.99% pure copper. Such copper widely searches because it readily available, there no long-lived Cu radioisotopes, and levels of...
The advent of commercial elemental MS/MS instrumentation has given rise to multiple opportunities for method development aimed at analytes in challenging matrices that either reduce or eliminate the need extensive sample pre-processing.Here, ultra-trace concentrations (ppq level) natural 232 Th and 238 U non-natural tracer isotopes 229 233 were measured a solution 10 ppm each Au, Pt, Ir, W 2% HNO3 using QQQ-ICP-MS.Polyatomic interferences across m/z range 227-239 characterized: major...
Abstract We study a possible calibration technique for the nEXO experiment using 127 Xe electron capture source. is next-generation search neutrinoless double beta decay (0 νββ ) that will use 5-tonne, monolithic liquid xenon time projection chamber (TPC). The xenon, used both as source and detection medium, be enriched to 90% in 136 Xe. To optimize event reconstruction energy resolution, calibrations are needed map position- time-dependent detector response. 36.3 day half-life of its small...
It is of great importance to develop a photodetector system with an ultralow radioactivity background in rare event searches. Silicon photomultipliers (SiPMs) and application-specific integrated circuits (ASICs) are two ideal candidates for low photosensors readout electronics, respectively, because they mainly composed silicon, which can achieve good radio-purity without considerable extra effort. However, interposers, used provide mechanical support signal routes between the photosensor...