Of using laser cooled and trapped Group II atomic species (Mg, Ca, Sr, and Ba) for ultra-precise optical clocks orīibliographic Databases on Atomic SpectroscopyĪtomic Transition Probability Bibliographic Database The purpose of this work is to provide critical atomic and molecular data needed in order to evaluate the feasibility Potential Energy Surface Database of Group II Dimer Molecules Electron-impact excitation cross sections are also included for some selected atoms. The high-incident energy behavior of the Bethe cross section. The cross sections were calculated using theīinary-Encounter-Bethe (BEB) model, which combines the Mott cross section with Small number of atoms and energy distributions of ejected electrons for H, He,Īnd H 2. The database also includes cross sections for a This is a database primarily of total ionization cross sections of With the 2-m Fourier transform spectrometer (FTS) at NIST. This atlas presents observations of the infra-red (IR) spectrum of a low current Th-Ar hollow cathode lamp With the spectral lines marked and their intensities, wavelengths,Īnd classifications listed. Lamp in the region 1130 Å to 4330 Å is given, Recommended Values of the Fundamental Physical Constants: 1998Īnd (2) accurate theoretical estimates are included for all transitions.Īn atlas of the spectrum of a platinum/neon hollow-cathode reference The numerical values are determined using constants from the most recent Two unique features of this database: (1) all experimental values are onĪ scale consistent with the International System of measurement (the SI) and The elements covered include Z = 10, neon to This X-ray transition table provides the energies and wavelengths for the K and L transitionsĬonnecting energy levels having principal quantum numbers n = 1, 2, 3, and 4. Site is designed to calculate the values as requested. Given the volume of the possible data, this Web Levels and transition frequencies as well as tables of frequencies. This interactive database allows a user to obtain individual energy The values are based on current knowledge of the relevant theoretical contributions including relativistic, quantumĮlectrodynamic, recoil, and nuclear size effects. N = 1 to 200 and all allowed orbital angular momenta l and total angular momenta j. This database provides theoretical values of energy levels of hydrogen and deuterium for principle quantum numbers The wavelengths, intensities, and spectrum assignments are given in a table for eachĮlement, and the resulting total of some 12,000 lines for all elements are also collected into a single table, sorted by The compilation includes data for the neutral and singly-ionized atoms of all elements hydrogen This handbook is designed to provide a selection of the most important and frequently used atomic spectroscopic data inĪn easily accessible format. Handbook of Basic Atomic Spectroscopic Data This form provides access to NIST critically evaluated data on ground states and ionization energies of atoms and atomic ions. Ion displayed in order of energy above the ground state. The levels database contains energy levels of a particular atom or Transition probabilitiesįor the lines are also displayed where available. Levels displayed in wavelength order with all selected spectra Application of the formulation to the analysis of the human femur-medial collateral ligament-tibia complex demonstrated the ability of the formulation to analyze large three-dimensional problems in the mechanics of biological joints.The lines database contains spectral lines and associated energy Results indicated that the formulation can reproduce the anisotropy and time-dependent material behavior observed in soft tissues. Test problems were analyzed to assess the performance of the discrete spectrum approximation and the accuracy of the finite element implementation. The viscoelastic material model was implemented in a general-purpose, nonlinear finite element program. A transversely isotropic hyperelastic material model developed for ligaments and tendons was used for the elastic response. This approximation provided a graphic means to fit experimental data with an exponential series. To allow efficient and easy computational implementation, a discrete spectrum approximation was developed for the QLV relaxation function. The quasilinear viscoelastic (QLV) theory provided the basis for the development. The objective of this work was to develop a theoretical and computational framework to apply the finite element method to anisotropic, viscoelastic soft tissues.
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