نتایج جستجو برای: electron spectrometer
تعداد نتایج: 327383 فیلتر نتایج به سال:
EPR spectroscopy employs a resonator operating at a single microwave frequency and phase-sensitive detection using modulation of the magnetic field. The X-band spectrometer is the general standard with a frequency in the 9-10 GHz range. Most (bio)molecular EPR spectra are determined by a combination of the frequency-dependent electronic Zeeman interaction and a number of frequency-independent i...
The application of mass spectrometric techniques to the real-time measurement and characterization of aerosols represents a significant advance in the field of atmospheric science. This review focuses on the aerosol mass spectrometer (AMS), an instrument designed and developed at Aerodyne Research, Inc. (ARI) that is the most widely used thermal vaporization AMS. The AMS uses aerodynamic lens i...
Tetraethoxysilane (TEOS, 28%), n-cetyltrimethylammonium bromide (CTAB, ≥99%), ammonium hydroxide solution (25%), 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC, 99%), N-Hydroxysuccinimide (NHS, 98%), 3-Aminopropyltriethoxy-silane (APTES, 99%), succinic anhydride (99%), sodium citrate tribasic dihydrate, tannic acid, and Rhodamine B were purchased from Sigma Company. Hydrogen tetrachloroaur...
Although it is well established that the source of carbon in the universe is the 3 (triple–alpha) nuclear reaction occurring in stars, the rate at which this process occurs, via the Hoyle state in 12 C, is surprisingly poorly known. The current uncertainty of ~12.5% on the radiative width of the 7.654 MeV E0 and 3.215 MeV E2 transitions de-exciting the Hoyle state limits our understanding of s...
We have made an absolute, reference-free measurement of the $1s2s\phantom{\rule{0.28em}{0ex}}^{3}S_{1}\ensuremath{\rightarrow}1{s}^{2}\phantom{\rule{0.28em}{0ex}}^{1}S_{0}$ relativistic magnetic dipole transition in He-like sulfur. The highly charged sulfur ions were provided by electron-cyclotron resonance ion source, and x rays analyzed with a high-precision double-crystal spectrometer. A ene...
The overlayer growth of cobalt on Mo(ll0) and the adsorption of CO and deuterium on Co/Mo(llO) have been studied by Auger electron spectroscopy (AES), low-energy electron diffraction (LEED) and temperature-programmed desorption (TPD). Co grows layer by layer on Mo(ll0) at a sample temperature of 115 K. Annealing multilayers of Co on Mo(ll0) to > 400 K results in the formation of three-dimension...
The intensity of surface spin wave excitations in inelastic electron scattering is measured as function of electron energy for fcc and hexagonal close packed (hcp) cobalt layers. Intensities are converted into scattering probabilities with the help of a recently established calibration of our spectrometer. The scattering probability as function of energy exhibits a peak around 7 and 3 eV for fc...
Tensor polarization observables ( t(20), t(21), and t(22)) have been measured in elastic electron-deuteron scattering for six values of momentum transfer between 0.66 and 1.7 (GeV/c)(2). The experiment was performed at the Jefferson Laboratory in Hall C using the electron High Momentum Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The n...
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We discuss the mechanisms, applications, and extraction of low-divergence laser-plasma-based electron beams that represent our past, current, and future research activities in the Center for Ultrafast Optical Science at the University of Michigan. We show experimentally that these beams have superior transverse emittance of 0.06 pi mm•mrad, along with nC charge, suitable for various application...
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