![L-edge X-ray absorption study of mononuclear vanadium complexes](http://s1.studyres.com/store/data/016733438_1-559cf19b1daffd726044ffb752c310b5-300x300.png)
Chemistry Basics - Mr. Grays Physical Science Class
... The properties of a substance are those characteristics that are used to identify or describe it. When we say that water is "wet", or that silver is "shiny", we are describing materials in terms of their properties. Properties can be divided into the categories of physical properties and chemical pr ...
... The properties of a substance are those characteristics that are used to identify or describe it. When we say that water is "wet", or that silver is "shiny", we are describing materials in terms of their properties. Properties can be divided into the categories of physical properties and chemical pr ...
Document
... H2(g) collected. (Vapor pressure of water = 0.025 atm at 21C.) • (A) 0.283 g • (B) 435 g • (C) 0.571 g • (D) 7.14 g ...
... H2(g) collected. (Vapor pressure of water = 0.025 atm at 21C.) • (A) 0.283 g • (B) 435 g • (C) 0.571 g • (D) 7.14 g ...
CLUE - virtual laboratories
... many times do we hear about “natural remedies, without drugs or chemicals,” despite the fact that everything is composed of chemicals and the most toxic chemicals known are natural products.2 A growing body of research results on student understanding of chemistry indicates, pretty emphatically, tha ...
... many times do we hear about “natural remedies, without drugs or chemicals,” despite the fact that everything is composed of chemicals and the most toxic chemicals known are natural products.2 A growing body of research results on student understanding of chemistry indicates, pretty emphatically, tha ...
The crucial role of triplets in photoinduced charge transfer and
... branch of this curve (in the direction of more negative DG) is located in ‘‘ normal region ’’ where |DGi| < lc , where lc is the contact value of electron transfer reorganization energy. The opposite descending branch of the same FEG curve covers the highly exergonic ‘‘ inverted region ’’, where |DG ...
... branch of this curve (in the direction of more negative DG) is located in ‘‘ normal region ’’ where |DGi| < lc , where lc is the contact value of electron transfer reorganization energy. The opposite descending branch of the same FEG curve covers the highly exergonic ‘‘ inverted region ’’, where |DG ...
Sample pages 2 PDF
... responsible for the existence of half-metallic ferromagnets in intermetallic compounds [16]. In this particular class of materials, an energy gap exists between the valence and conduction bands for electrons of one spin polarization, while this gap is absent for electrons of the other spin polarizat ...
... responsible for the existence of half-metallic ferromagnets in intermetallic compounds [16]. In this particular class of materials, an energy gap exists between the valence and conduction bands for electrons of one spin polarization, while this gap is absent for electrons of the other spin polarizat ...
Properties of Graphene in an External Magnetic
... graphene as well as to graphene’s behavior in an external magnetic field perpendicular to it. After a brief motivation in the following section 1.1, we will work out the basic properties of graphene in chapter 2 and focus on the geometry of the 2D honeycomb lattice. In chapter 3, we first develop a ...
... graphene as well as to graphene’s behavior in an external magnetic field perpendicular to it. After a brief motivation in the following section 1.1, we will work out the basic properties of graphene in chapter 2 and focus on the geometry of the 2D honeycomb lattice. In chapter 3, we first develop a ...
Kondo physics in the single-electron transistor with ac driving Peter Nordlander
... we speculate has roughly the same effect on the Kondo peak as the energy smearing due to a finite temperature. We can test this conjecture by calculating the equilibrium conductance at an effective temperature T eff given by T eff⫽T ⫹⌫ decay . The results of such a calculation are shown in Fig. 3 共P ...
... we speculate has roughly the same effect on the Kondo peak as the energy smearing due to a finite temperature. We can test this conjecture by calculating the equilibrium conductance at an effective temperature T eff given by T eff⫽T ⫹⌫ decay . The results of such a calculation are shown in Fig. 3 共P ...
PC_Chemistry_Macomb_April08
... For each element, the arrangement of electrons surrounding the nucleus is unique. These electrons are found in different energy levels and can only move from a lower energy level (closer to nucleus) to a higher energy level (farther from nucleus) by absorbing energy in discrete packets. The energy c ...
... For each element, the arrangement of electrons surrounding the nucleus is unique. These electrons are found in different energy levels and can only move from a lower energy level (closer to nucleus) to a higher energy level (farther from nucleus) by absorbing energy in discrete packets. The energy c ...
Physical Science Standards
... SPI identify common elements, given symbols or names. TPI recognize and recall symbols and names for common elements. SPI distinguish between metals and nonmetals, given examples. TPI identify an element as a metal or nonmetal based on its physical ...
... SPI identify common elements, given symbols or names. TPI recognize and recall symbols and names for common elements. SPI distinguish between metals and nonmetals, given examples. TPI identify an element as a metal or nonmetal based on its physical ...
BASIS SET SUPERPOSITION ERROR EFFECTS, EXCITED-STATE POTENTIAL ENERGY SURFACE AND
... Summary of the thesis The study of the photophysics of thymine is the main objective of this thesis. This work has been divided in 4 parts; the first two parts are devoted to find a proper level of theory for the study of thymine, whereas in the third and fourth parts the photohpysics of thymine ar ...
... Summary of the thesis The study of the photophysics of thymine is the main objective of this thesis. This work has been divided in 4 parts; the first two parts are devoted to find a proper level of theory for the study of thymine, whereas in the third and fourth parts the photohpysics of thymine ar ...
Lanthanides and Actinides
... to the numerous isotopes occurring for some lanthanides and actinides, which cause a huge number of spectral lines. A simple model is needed to extract the basic features of the electronic structure and to enable a successful analysis of the experimentally determined data to be made. For an experime ...
... to the numerous isotopes occurring for some lanthanides and actinides, which cause a huge number of spectral lines. A simple model is needed to extract the basic features of the electronic structure and to enable a successful analysis of the experimentally determined data to be made. For an experime ...
Youngseok Kim, Brian Dellabetta, and Matthew J. Gilbert , "Interlayer Transport in Disordered Semiconductor Electron Bilayers," Journal of Physics: Condensed Matter 24 , 355301 (2012).
... However, when disorder localizes the electron states in the bottom layer, the interlayer tunneling is locally enhanced, leading to increased interlayer transmission near the injection contact. Beyond locally enhanced transmission, the presence of disorder in the top layer perturbs the electron state ...
... However, when disorder localizes the electron states in the bottom layer, the interlayer tunneling is locally enhanced, leading to increased interlayer transmission near the injection contact. Beyond locally enhanced transmission, the presence of disorder in the top layer perturbs the electron state ...
X-ray photoelectron spectroscopy
![](https://commons.wikimedia.org/wiki/Special:FilePath/System2.gif?width=300)
X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique that measures the elemental composition at the parts per thousand range, empirical formula, chemical state and electronic state of the elements that exist within a material. XPS spectra are obtained by irradiating a material with a beam of X-rays while simultaneously measuring the kinetic energy and number of electrons that escape from the top 0 to 10 nm of the material being analyzed. XPS requires high vacuum (P ~ 10−8 millibar) or ultra-high vacuum (UHV; P < 10−9 millibar) conditions, although a current area of development is ambient-pressure XPS, in which samples are analyzed at pressures of a few tens of millibar.XPS is a surface chemical analysis technique that can be used to analyze the surface chemistry of a material in its as-received state, or after some treatment, for example: fracturing, cutting or scraping in air or UHV to expose the bulk chemistry, ion beam etching to clean off some or all of the surface contamination (with mild ion etching) or to intentionally expose deeper layers of the sample (with more extensive ion etching) in depth-profiling XPS, exposure to heat to study the changes due to heating, exposure to reactive gases or solutions, exposure to ion beam implant, exposure to ultraviolet light.XPS is also known as ESCA (Electron Spectroscopy for Chemical Analysis), an abbreviation introduced by Kai Siegbahn's research group to emphasize the chemical (rather than merely elemental) information that the technique provides.In principle XPS detects all elements. In practice, using typical laboratory-scale X-ray sources, XPS detects all elements with an atomic number (Z) of 3 (lithium) and above. It cannot easily detect hydrogen (Z = 1) or helium (Z = 2).Detection limits for most of the elements (on a modern instrument) are in the parts per thousand range. Detection limits of parts per million (ppm) are possible, but require special conditions: concentration at top surface or very long collection time (overnight).XPS is routinely used to analyze inorganic compounds, metal alloys, semiconductors, polymers, elements, catalysts, glasses, ceramics, paints, papers, inks, woods, plant parts, make-up, teeth, bones, medical implants, bio-materials, viscous oils, glues, ion-modified materials and many others.XPS is less routinely used to analyze the hydrated forms of some of the above materials by freezing the samples in their hydrated state in an ultra pure environment, and allowing or causing multilayers of ice to sublime away prior to analysis. Such hydrated XPS analysis allows hydrated sample structures, which may be different from vacuum-dehydrated sample structures, to be studied in their more relevant as-used hydrated structure. Many bio-materials such as hydrogels are examples of such samples.