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Physics and Chemistry of Electrons and Ions in Condensed Matter pp 335–360Cite as

X-Ray Absorption Spectroscopy across the Metal to Non-Metal Transition

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Part of the book series: NATO ASI Series ((ASIC,volume 130))

Abstract

The screening of the Coulomb potential in a polar fluid will be described and applied to Mx(NH3)1-x solutions. These undergo a metal to non-metal transition which is made evident in different physical properties near x = xc = 0.04.

Dedicated to Carol and Prof. M J Sienko, QEPD

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Abbreviations

MAS:

Metal Ammonia Solutions

XAS:

X-Ray Absorption Spectroscopy

XANES:

X-Ray Near Edge Absorption Spectroscopy

V:

Valence of absorber

Z:

Atomic number of absorber

A:

Absorbance of x-rays by a given material

Anm:

For nonmetals

As :

For semimetals

Am :

For metals

Ag :

For materials with overlapping bands

A0 :

For material near 0°K

A1 :

First order approximation (neglecting (l-f)f ≪ 1 and/or dg ≈ 0) A1 = A - Anm Absorbance below the edge E0

ν0 :

To the bottom of the conduction band

νF :

To the Fermi level

ν0 :

To the edge of the continuum of free states in non metals (E0= hν0) y = y(ν) = h(ν - ν0 0)2EFu-1 : dimensionless parameter which measures the photon energy from the bottom of the conduction band in units of a resonance line half width at half height (ħ/Tν = 2EF/u).

N(ν):

Density of states near E = hν above the 1s level of the absorber

Dν :

Relative intensity of resonance line near E = hν

2Eg :

Activation energy in simple semimetal

gc :

Mott ratio g measured near the mobility edge

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Author information

Authors and Affiliations

  1. San Jose State University, San Jose, CA, 95192, USA

    J. V. Acrivos

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  1. J. V. Acrivos
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Editor information

Editors and Affiliations

  1. San José University, San José, California, USA

    J. V. Acrivos

  2. Trinity College, Cambridge, UK

    J. V. Acrivos

  3. Cavendish Laboratory, Cambridge, UK

    N. F. Mott  & A. D. Yoffe  & 

  4. Gonville and Caius College, Cambridge, UK

    N. F. Mott

  5. Darwin College, Cambridge, UK

    A. D. Yoffe

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© 1984 D. Reidel Publishing Company

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Acrivos, J.V. (1984). X-Ray Absorption Spectroscopy across the Metal to Non-Metal Transition. In: Acrivos, J.V., Mott, N.F., Yoffe, A.D. (eds) Physics and Chemistry of Electrons and Ions in Condensed Matter. NATO ASI Series, vol 130. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6440-2_30

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  • DOI: https://doi.org/10.1007/978-94-009-6440-2_30

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