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in subjects: "Kramers-Kronig"

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Submillimeter and microwave residual losses in epitaxial films of Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O

We have used a novel bolometric technique and a resonant technique to obtain accurate submillimeter and microwave residual loss data for epitaxial thin films of YBa{sub 2}Cu{sub 3}O{sub 7}, Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub 10} and Tl{sub 2}CaBa{sub 2}Cu{sub 2}O{sub 8}. For all films we obtain good agreement between the submillimeter and microwave data, with the residual losses in both the Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O films scaling approximately as frequency squared below {approximately}… more

Date: December 1, 1992

Creator: Miller, D; Richards, P. L.; Eom, C. B.; Geballe, T. H.; Garrison, S. M.; Newman, N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Direct Comparison of Brookhaven Reflectivity Measurements with Free-Electron Theory

The reflectivity at normal incidence of copper and aluminum samples was recently measured over a large frequency range at Brookhaven by one of us (JT). Then using the Kramers-Kroning integrals, and assuming the free-electron model of conductivity, the dependence of conductivity on frequency was obtained. The results seemed to suggest, for example, that the dc conductivities of the copper and evaporated aluminum samples are a factor of 3 lower than expected. We propose in this report, instead, d… more

Date: December 13, 2010

Creator: Bane, Karl L.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Optical systems for synchrotron radiation

Various fundamental topics which underlie the design and use of optical systems for synchrotron radiation are considered from the viewpoint of linear system theory. These topics include the damped harmonic oscillator, free space propagation of an optical field, electromagnetic theory of optical properties of materials, theory of dispersion, and the Kramers-Kronig relations. 32 refs., 5 figs. (LEW)

Date: December 1, 1985

Creator: Howells, M.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Submillimeter residual losses in high-{Tc} superconductors

Bolometry was used obtain accurate submillimeter residual loss data for epitaxial films of YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO), Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub 10}, Tl{sub 2}CaBa{sub 2}Cu{sub 2}O{sub 8} (TCBCO), and Ba{sub 0.6}K{sub 0.4}BiO{sub 3} (BKBO). We were able to fit the absorptivity measured for Nb films to an Eliashberg strong coupling calculation; excellent agreement resulted between parameters from best fits and measured Residual Resistivity Ratio. Microwave surface resista… more

Date: September 1, 1993

Creator: Miller, D.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Optical properties of Nb--Mo and other alloys of Nb with its nearest neighbors in the periodic table

Optical properties of Nb alloys were investigated. Calorimetric measurements of absorptivity between 0.2 and 5.5 eV were taken for Nb samples with 20, 50, and 80 percent Mo and for Nb samples containing 10 percent Zr, 20 percent V, and 20 percent Ta. Reflectivity data for two of these samples in the ultraviolet region and known reflectivities for the pure metals to 35 eV provided the basis for extrapolation to high energies. The data were Kramers--Kronig analyzed to determine the dielectric fun… more

Date: October 1, 1975

Creator: Black, E. S.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Optical systems for synchrotron radiation. Lecture 1. Introductory topics. Revision

Various fundamental topics are considered which underlie the design and use of optical systems for synchrotron radiation. The point of view of linear system theory is chosen which acts as a unifying concept throughout the series. In this context the important optical quantities usually appear as either impulse response functions (Green's functions) or frequency transfer functions (Fourier Transforms of the Green's functions). Topics include the damped harmonic oscillator, free-space optical fie… more

Date: February 1, 1986

Creator: Howells, M.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A technique for measurement of vector and tensor polarization in solid spin one polarized targets

Vector and tensor polarizations are explicitly defined and used to characterize the polarization states of spin one polarized targets, and a technique for extracting these polarizations from nuclear magnetic resonance (NMR) data is developed. This technique is independent of assumptions about spin temperature, but assumes the target's crystal structure induces a quadrupole interaction with the spin one particles. Analysis of the NMR signals involves a computer curve fitting algorithm implemente… more

Date: June 1, 1991

Creator: Kielhorn, W.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Submillimeter and microwave residual losses in epitaxial films of Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O

We have used a novel bolometric technique and a resonant technique to obtain accurate submillimeter and microwave residual loss data for epitaxial thin films of YBa[sub 2]Cu[sub 3]O[sub 7], Tl[sub 2]Ca[sub 2]Ba[sub 2]Cu[sub 3]O[sub 10] and Tl[sub 2]CaBa[sub 2]Cu[sub 2]O[sub 8]. For all films we obtain good agreement between the submillimeter and microwave data, with the residual losses in both the Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O films scaling approximately as frequency squared below [approximately]… more

Date: December 1, 1992

Creator: Miller, D.; Richards, P. L.; Eom, C. B.; Geballe, T. H.; Garrison, S. M.; Newman, N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Final Report, DOE Award Number DE-FG02-02ER45964, Electromagnetic Properties of Matter at X-ray Wavelengths

We report results of a collaborative study of photon and charged-particle interactions with matter between the University of Vermont and Argonne and Brookhaven National Laboratories. A major goal was to extend the study of electromagnetic properties of selected materials to as wide a spectral range as possible. This broad approach discloses systematic trends not apparent in isolated measurements and exploits the power of dispersion analysis and sum-rule constraints. Emphasis was largely on UV a… more

Date: February 28, 2007

Creator: Smith, David Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department