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Showing 1 to 18 of 18 for “"MICROWAVE ABSORPTION"”.
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The microwave absorption spectrum of deutero formaldehyde
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Physics, 1951.
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Application of pressure broadening theory to atmospheric microwave absorption.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1976
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Structure and properties of high temperature molecules by microwave absorption spectroscopy
Contains fulltext : mmubn000001_207567794.pdf (Publisher’s version ) (Open Access)
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Chemical Correlation of Magnetic Permeability and Microwave Absorption in Spinel Ferrite Nanoparticles
… highlights how magnetic anisotropy influences absorption. Co-rich ferrites display broader linewidths (FWHM), while Zn-rich variants show increased absorption from reduced damping. Interestingly, Co-containing ferrites demonstrated a unique FMR emission profile, likely resulting from cobalt's …
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Low Field Microwave Absorption in Nano-Magnetic Participle - incorporated YBa2Cu3O7-z Superconducting Materials
… the most implausible circumstances in low eld microwave absorption measurement. This new revelation may lead to unconventional avenues to explore novel SC for applications in superconducting spintronics. By means of a varienty of techniques, including EPR, SEM, FTIR, PPMS/VSM and XRD, …
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Optical Processes in Xenon: Multiphoton Ionization and Ultraviolet Photodissociation of the Dimer Ion
… of xenon at 193 nm has been measured using a microwave absorption scheme which determines peak electron densities. The electron-neutral collision frequency, (nu)(,m), has been obtained using a microwave bridge and the result is consistent with 0.7 eV electrons. It is found that when an ArF and …
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Optical Processes in Krypton and Krypton(2)fluoride: Absolute Cross-Sections for Multiphoton Ionization of Krypton (1S(0)), Photoionization of Metastable Atomic and Molecular States of Krypton, Andabsorption of Krypton(2)fluoride (4-Doublet-Gamma)
A microwave absorption apparatus has been used to measure a cross section for the three-photon, resonantly-enhanced ionization of Kr(('1)S(,0)) at 193 nm. The presence of a two-photon resonance with the Kr 6p 3/2 (,2) level enabled the generation of large electron densities and a measurement of the …
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Kinetics and radiative processes of a xenon and iodine inductive RF discharge at low pressure
… study include laser-induced fluorescence (LIF), absorption spectroscopy, emission spectroscopy, microwave interferometry, and microwave absorption. Results from this research indicate that Xe + I$\sb2\sp{*}\sp{*}{\to}$ XeI* + I is the major precursor reaction leading to XeI* radiation. This …
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Storm-wide precipitation retrievals
… systems, and visible, infrared, and passive microwave sensors in orbiting satellites. This research project uses data from the Advanced Microwave Sounding Unit (AMSU-A and AMSU-B) which consists of passive microwave sensors that collect data in the opaque water vapor and oxygen microwave …
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Spin Currents in Organic Semiconductors
… Measuring linewidth broadening of the microwave absorption at ferromagnetic resonance due to increase in effective Gilbert damping by spin pumping from a ferromagnetic substrate into an adjacent non-magnetic semiconductor allows us to quantify the spin-mixing conductance. This technique …
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A novel vacuum window for megawatt gyrotrons
This thesis describes a new microwave output window for megawatt power level, 110 GHz gyrotrons. The window uses two spherically polished sapphire elements separated by a nearly uniform gap of about 1 mm. Pressurized, microwave transpar- ent coolant flows through this gap and across the …
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Kinetics and radiactive processes of a XE and I2 inductive RF discharge at low pressure
… study include laser-induced fluorescence (LIF) I absorption spectroscopy, emission spectroscopy, microwave interferometry, and microwave absorption. Results from this research indicate that Xe + I 2** ~ Xei* + I is the major precursor reaction leading to Xei* radiation. This conclusion differs …
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Crystallization of Lithium Disilicate Glass Using Variable Frequency Microwave Processing
… a large number of useful glass-ceramic products. Microwave processing of materials such as glass-ceramics offers unique benefits over conventional processing techniques. Variable frequency microwave (VFM) processing is an advanced processing technique developed to overcome the hot spot and the …
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Effects of particles’ size and composition on magnetic properties of substituted ferrite nanoparticles
… This anomalous peak may be due to the low field microwave absorption(LFMA) phenomenon that is not fully understood in magnetic materials. NixCo1−xFe2O4 were successfully indexed to the cubic spinel. An additional peak associated with α-Fe2O3 was observed for samples with 0.7 ≤ x ≤ 0.9. XRD …
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Diagnostic techniques for EHD and MHD interaction
… determined by means of emission spectroscopy and microwave absorption measurements. A deviation from thermodynamic equilibrium had been observed. The electron number density showed to be frozen at the stagnation region condition in the expansion through the nozzle. MHD experiments have been …
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TiO2 and ZnO metal oxides lattice defects driven magnetism and their contribution in discoloring of dyes
… in a shape-selective manner using simple microwave assisted hydrothermal synthesis. The direct correlation between the observed ferromagnetism and the relative concentration of oxygen and zinc vacancies that exist, suggest their vital role in modulating ferromagnetic behavior. These …
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ΕΠΑΓΟΜΕΝΗ ΜΕ ΚΡΟΥΣΕΙΣ ΑΠΟΡΡΟΦΗΣΗ ΜΙΚΡΟΚΥΜΑΤΩΝ ΑΠΟ ΤΟ CO2 ΣΤΟΥΣ 2.7, 6.5 ΚΑΙ 14.8 GHZ
… CO2, AS INDIVIDUAL MOLECULES DO NOT ABSORB THE MICROWAVE ENERGY. BUT THE TRANSIENT DIPOLES FORMED DURING THE MOLECULAR COLLISIONS HAVE A CHARACTERISTIC ABSORPTION SPECTRUM WITH AN ASSOCIATED ABSORPTION COEFFICIENT SEVERAL ORDERS OF MAGNITUDE LESS THAN THE ORDINARY SPECTRA. THE MEASUREMENT OF …