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Showing 1 to 20 of 605 for “"Argon"”.
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Potassium-Argon Dating
<p>The unstable radioactive isotope K40 decays to the stable radiogenic isotopes A40 and Ca40. The rate of decay is a constant ratio, called the branching ratio, and is used to determine the age of a mineral. Because potassium exists almost everywhere this gives us a valuable method for dating …
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The marine geochemistry of argon
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1964.
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Excited State Spectroscopy of Diatomic Argon
Laser-induced fluorescence spectra for the $7p\sigma\ \sp3\Sigma\sbsp{g}{+}\gets a\ \sp3\Sigma\sbsp{u}{+}$ transition have led to the first resolved triplet splittings and rotational analyses for Rydberg-Rydberg transitions in Ar$\sb2.$ Analyses for the (0-0), (0-1), (1-0), and (1-1) bands of …
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Simulated liquid argon interactions with neutrons
… backgrounds in the MiniCLEAN single phase liquid argon WIMP detector. Elastic and inelastic collisions between neutrons and argon nuclei as well as neutron captures were simulated independently in order to characterize the accuracy of the implementation by GEANT4.9.3.pOl and GEANT4.9.5. The …
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Low-Temperature Bulk-Modulus of Solid Argon
Made available in DSpace on 2015-05-12T22:38:59Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7405735.PDF: 4331136 bytes, checksum: 28d4c92935b9f534b5ad68bc8ec65beb (MD5) Previous issue date: 1973
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An Investigation of Hydrogen-Oxygen-Argon Detonations
Made available in DSpace on 2014-12-10T23:36:45Z (GMT). No. of bitstreams: 1 7411949.pdf: 5440085 bytes, checksum: 118092a5d9339486640507c5a7e03f23 (MD5) Previous issue date: 1973
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Equilibrium vacancy concentration measurements in solid argon
… concentrations, has been applied to solid argon. The results indicate that vacancy concentrations do not exceed 0.02% even at the highest temperatures. Although the data obtained were not sufficiently precise to allow unique values to be determined for the formation parameters, it would …
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Low temperature bulk modulus of solid argon
The lattice parameter of a free-standing argon crystal has been measured as a function of pressure at constant temperature using a high precision back-reflection X-ray camera. Low temperature measurements, using helium as the pressure transmitting fluid, are reported which cover the pressure range …
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Photoassociative Spectroscopy of Ultracold Metastable Argon and Study of Dual Species Trap Loss in a Rubidium-Metastable Argon MOT
… species trap loss in a rubidium - metastable argon magneto-optical trap and the photoassociative spectroscopy of ultracold metastable argon. The interspecies trap loss rate coefficients have been measured for ultracold collisions between <sup>85</sup>Rb and <sup>40</sup>Ar* in a dual-species …
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A spectroscopic investigation of an argon glow discharge
The positive column of an Argon glow discharge was observed through a Fabry-Perot interferometer with a prism spectrograph in order to determine if a Doppler shift occurs. No Doppler shifts were observed; however, further refinements in equipment and technique are required before it can be reported …
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Development of a liquid argon purity monitoring system
Liquid argon time-projection chambers (LArTPCs) are used to detect charged particles and measure their properties. Charged particles that pass through the liquid argon (LAr) in a LArTPC ionize and excite argon atoms, producing ionization electrons and prompt scintillation light. The ionization …
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Fundamental properties of a microwave induced argon plasma
… behaviour of a microwave excited electrodeless argon discharge is investigated at pressures between 0.02 and 6.00 mbar. Spectroscopic measurements of twenty one emission lines of the argon I spectrum and seven lines of the argon II spectrum are combined with microwave impedance and Langmuir …
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Argon Ion Sputtering of Niobium and Niobium Alloys
Made available in DSpace on 2014-12-14T16:00:38Z (GMT). No. of bitstreams: 1 7821063.pdf: 6678565 bytes, checksum: e83145c963afeb12ae16a83efdac2602 (MD5) Previous issue date: 1978
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Inter-Rydberg spectroscopy of argon and neon dimers
Rydberg $\gets$ Rydberg transitions of Ar$\sb2$ and Ne$\sb2$ have been observed for the first time by laser-excitation spectroscopy. Molecular Rydbergs converging to the $A\sp2\Sigma\sbsp{1/2\rm u}{+}$ ion core having principal quantum numbers as large as 26 for Ar$\sb2$ and 17 for Ne$\sb2$ have …
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Pi+ Cross Section on Argon for the LArIAT Experiment
<p>LArIAT (Liquid Argon in a Testbeam) was a LArTPC experiment exposed to a charged-particle beam at the test-beam facility at Fermi National Accelerator Laboratory. This analysis measures the $\pi^+$-Ar cross section over an interacting energy range of 50-1100 MeV, accounting for background …
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Toward a Precision Measurement of CEvNS on Liquid Argon
… section on several targets. The first liquid argon measurement was made in 2021. The collaboration is currently undertaking precise measurements of the CEvNS cross section, the first of such measurements to be made on the liquid argon detector COH Ar 750. Making a precise measurement of the …
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