1,421 research outputs found
Spatial oscillations in the spontaneous emission rate of an atom inside a metallic wedge
A method of images is applied to study the spontaneous emission of an atom
inside a metallic wedge with an opening angle of , where N is an
arbitrary positive integer. We show the method of images gives a rate formula
consistent with that from Quantum Electrodynamics. Using the method of images,
we show the correspondence between the oscillations in the spontaneous emission
rate and the closed-orbits of emitted photon going away and returning to the
atom inside the wedge. The closed-orbits can be readily constructed using the
method of images and they are also extracted from the spontaneous emission
rate.Comment: 8 figure
Nearly strain-free heteroepitaxial system for fundamental studies of pulsed laser deposition: EuTiO3 on SrTiO3
High quality epitaxial thin-films of EuTiO3 have been grown on the (001)
surface of SrTiO3 using pulsed laser deposition. In situ x-ray reflectivity
measurements reveal that the growth is two-dimensional and enable real-time
monitoring of the film thickness and roughness during growth. The film
thickness, surface mosaic, surface roughness, and strain were characterized in
detail using ex situ x-ray diffraction. The thicnkess and composition were
confirmed with Rutherford Backscattering. The EuTiO3 films grow
two-dimensionally, epitaxially, pseudomorphically, with no measurable in-plane
lattice mismatch.Comment: 7 pages, 6 figure
Willy
47 pages : color illustrations; 21 x 27 cm. 1st edition. Library edition Dust jacket with color illustration. Catching the troublesome rat besieging the kitchen challenges a ghetto youth\u27s cleverness and establishes him as the family protector. Curated title for Fleet Library Special Collections exhibition By Hand: Women & Books Exhibit fall, 2021.https://digitalcommons.risd.edu/specialcollections_books_illustration/1022/thumbnail.jp
Observed Effects of a Changing Step-Edge Density on Thin-Film Growth Dynamics
We grew SrTiO3 on SrTiO3 [001] by pulsed laser deposition, while observing
x-ray diffraction at the (0 0 .5) position. The drop dI in the x-ray intensity
following a laser pulse contains information about plume-surface interactions.
Kinematic theory predicts dI/I = -4sigma(1-sigma), so that dI/I depends only on
the amount of deposited material sigma. In contrast, we observed experimentally
that |dI/I| < 4sigma(1-sigma), and that dI/I depends on the phase of x-ray
growth oscillations. The combined results suggest a fast smoothing mechanism
that depends on surface step-edge density.Comment: 4 figure
X-ray scattering from surfaces: discrete and continuous components of roughness
Incoherent surface scattering yields a statistical description of the
surface, due to the ensemble averaging over many independently sampled volumes.
Depending on the state of the surface and direction of the scattering vector
relative to the surface normal, the height distribution is discrete,
continuous, or a combination of the two. We present a treatment for the
influence of multimodal surface height distributions on Crystal Truncation Rod
scattering. The effects of a multimodal height distribution are especially
evident during in situ monitoring of layer-by-layer thin-film growth via Pulsed
Laser Deposition. We model the total height distribution as a convolution of
discrete and continuous components, resulting in a broadly applicable
parameterization of surface roughness which can be applied to other scattering
probes, such as electrons and neutrons. Convolution of such distributions could
potentially be applied to interface or chemical scattering. Here we find that
this analysis describes accurately our experimental studies of SrTiO3
annealing and homoepitaxial growth.Comment: 15 pages, 7 figure
Munsell Book of Color: defining, explaining, and illustrating the fundamental characteristics of color
42 pages, 26 color leaves of plates (some double) : illustrations ; 33cm ; Standard Edition. Preface signed: A.E.O. Munsell. Three masks laid in. Gift of Harris Equipment Fund. A revision and extension of The atlas of the Munsell color system by A.H. Munsell.https://digitalcommons.risd.edu/specialcollections_books_color/1000/thumbnail.jp
Dilute ferrimagnetic semiconductors in Fe-substituted spinel ZnGaO
Solid solutions of nominal composition
[ZnGaO][FeO], of the semiconducting spinel
ZnGaO with the ferrimagnetic spinel FeO have been prepared with
= 0.05, 0.10, and 0.15. All samples show evidence for long-range magnetic
ordering with ferromagnetic hysteresis at low temperatures. Magnetization as a
function of field for the = 0.15 sample is S-shaped at temperatures as high
as 200 K. M\"ossbauer spectroscopy on the = 0.15 sample confirms the
presence of Fe, and spontaneous magnetization at 4.2 K. The magnetic
behavior is obtained without greatly affecting the semiconducting properties of
the host; diffuse reflectance optical spectroscopy indicates that Fe
substitution up to = 0.15 does not affect the position of the band edge
absorption. These promising results motivate the possibility of dilute
ferrimagnetic semiconductors which do not require carrier mediation of the
magnetic moment.Comment: 9 pages and 6 figure
6-Deoxyhexoses froml-Rhamnose in the Search for Inducers of the Rhamnose Operon: Synergy of Chemistry and Biotechnology
In the search for alternative nonâmetabolizable inducers in the l ârhamnose promoter system, the synthesis of fifteen 6âdeoxyhexoses from l ârhamnose demonstrates the value of synergy between biotechnology and chemistry. The readily available 2,3âacetonide of rhamnonolactone allows inversion of configuration at C4 and/or C5 of rhamnose to give 6âdeoxyâd âallose, 6âdeoxyâd âgulose and 6âdeoxyâl âtalose. Highly crystalline 3,5âbenzylidene rhamnonolactone gives easy access to l âquinovose (6âdeoxyâl âglucose), l âolivose and rhamnose analogue with C2 azido, amino and acetamido substituents. Electrophilic fluorination of rhamnal gives a mixture of 2âdeoxyâ2âfluoroâl ârhamnose and 2âdeoxyâ2âfluoroâl âquinovose. Biotechnology provides access to 6âdeoxyâl âaltrose and 1âdeoxyâl âfructose
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