R. I. Thompson
YOU?
Author Swipe
View article: Optimizing Ion Optical Design for Laser Ablation Source in Mass Spectrometry
Optimizing Ion Optical Design for Laser Ablation Source in Mass Spectrometry Open
The study focuses on optimizing a Laser Ablation Source (LAS) for use in mass spectrometry, particularly aiming to enhance transmission of ions and and determination of isotopic compositions in diverse matrices at TRIUMF’s Ion Trap for Ato…
View article: Measurements of Penning-Malmberg trap patch potentials and associated performance degradation
Measurements of Penning-Malmberg trap patch potentials and associated performance degradation Open
Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after the trap is illuminated by laser light for several hours. These phenomena can be cause…
View article: Observation of the effect of gravity on the motion of antimatter
Observation of the effect of gravity on the motion of antimatter Open
Einstein’s general theory of relativity from 1915 1 remains the most successful description of gravitation. From the 1919 solar eclipse 2 to the observation of gravitational waves 3 , the theory has passed many crucial experimental tests. …
View article: Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment
Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment Open
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low energy (≲100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic field…
View article: Commissioning of a multi-purpose offline ion source at the TITAN experiment
Commissioning of a multi-purpose offline ion source at the TITAN experiment Open
The controlled focusing and transport of ion beams is of paramount importance in particle accelerators, high energy beamlines, and detector systems, as it determines the sensitivity and resolution of the instruments. Therefore, it is essen…
View article: Laser cooling of antihydrogen atoms
Laser cooling of antihydrogen atoms Open
The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision 1 . Slowing the translational motion of atoms and ions by application of such…
View article: Investigation of the fine structure of antihydrogen
Investigation of the fine structure of antihydrogen Open
At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fine structure of atomic hydrogen: a separation of the 2S1/2 and 2P1/2 states1. The observation of…
View article: Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>r</mml:mi></mml:math>-process abundance peak in neutron-star merger calculations
Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first -process abundance peak in neutron-star merger calculations Open
We report mass measurements of neutron-rich Ga isotopes $^{80-85}$Ga with\nTRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The measurements\ndetermine the masses of $^{80-83}$Ga in good agreement with previous\nmeasurements. The …
View article: Measuring the isotopic composition of trace elements in zircon: application to radiogenic molybdenum
Measuring the isotopic composition of trace elements in zircon: application to radiogenic molybdenum Open
Techniques have been developed to measure the isotopic composition of trace elements from matrices predominantly consisting of interfering isotopes. These techniques have been applied to measuring mass-independent fractionation of molybden…
View article: Measuring the isotopic composition of trace elements in zircon:\n application to radiogenic molybdenum
Measuring the isotopic composition of trace elements in zircon:\n application to radiogenic molybdenum Open
Techniques have been developed to measure the isotopic composition of trace\nelements from matrices predominantly consisting of interfering isotopes. These\ntechniques have been applied to measuring mass-independent fractionation of\nmolyb…
View article: Characterization of the 1S–2S transition in antihydrogen
Characterization of the 1S–2S transition in antihydrogen Open
In 1928, Dirac published an equation 1 that combined quantum mechanics and special relativity. Negative-energy solutions to this equation, rather than being unphysical as initially thought, represented a class of hitherto unobserved and un…
View article: Enhanced Control and Reproducibility of Non-Neutral Plasmas
Enhanced Control and Reproducibility of Non-Neutral Plasmas Open
The simultaneous control of the density and particle number of non-neutral plasmas confined in Penning-Malmberg traps is demonstrated. Control is achieved by setting the plasma's density by applying a rotating electric field while simultan…
View article: Precision mass measurements of magnesium isotopes and implications for the validity of the isobaric mass multiplet equation
Precision mass measurements of magnesium isotopes and implications for the validity of the isobaric mass multiplet equation Open
If the mass excess of neutron-deficient nuclei and their neutron-rich mirror\npartners are both known, it can be shown that deviations of the Isobaric Mass\nMultiplet Equation (IMME) in the form of a cubic term can be probed. Such a\ncubic…
View article: Observation of the 1S–2S transition in trapped antihydrogen
Observation of the 1S–2S transition in trapped antihydrogen Open
The spectrum of the hydrogen atom has played a central part in fundamental physics over the past 200 years. Historical examples of its importance include the wavelength measurements of absorption lines in the solar spectrum by Fraunhofer, …
View article: An improved limit on the charge of antihydrogen from stochastic acceleration
An improved limit on the charge of antihydrogen from stochastic acceleration Open
Antimatter continues to intrigue physicists because of its apparent absence in the observable Universe. Current theory requires that matter and antimatter appeared in equal quantities after the Big Bang, but the Standard Model of particle …
View article: Combination of interventions can change students’ epistemological beliefs
Combination of interventions can change students’ epistemological beliefs Open
This study was based on the hypothesis that students’ epistemological beliefs could become more expertlike with a combination of appropriate instructional activities: (i) preclass reading with metacognitive reflection, and (ii) in-class ac…