Optical Constants of Transition Metals in the Infrared*

Lenham, A. P.; Treherne, D. M.

doi:10.1364/josa.56.001137

Cited by 58 publications

(13 citation statements)

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“…A calorimetric method was used between 0.1 and 4.88 eV to determine the absorptivity A=I-R at 4.2K and a 15 ~ angle of incidence. The very wide energy range used in Kramers-Kronig analysis and the quite good agreement below 5 eV with the data of Nestell and Christy [19] make the n and k values here reported in the 0.1-0.5 eV range more reliable than those obtained by ellipsometry [1][2][3][4][5][6]22]. A comparison of low-energy absorptivities with those calculated from the n and k values of Bolotin et al [1] show good qualitative agreement, although A values are considerably lower in magnitude (that is, R was higher).…”

supporting

confidence: 65%

Vanadium (V)

Guizzetti¹,

Piaggi²

1997

Handbook of Optical Constants of Solids

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There have been many measurements of the optical properties of V . Although in the 1960s they were generally obtained on bulk samples mechanically polished, in later years films were preferentially used. The optical properties of the V films are strongly dependent on the preparation technique and the physical-chemical conditions (in particular, deposition rate and substrate temperature). To some degree this can explain scatter among the data. Moreover, V is particularly sensitive to oxide, but no author has quantitatively estimated the oxide-coating effect on the optical response. In any case, the best films give a response very similar to the bulk.The room-temperature values of n and k tabulated here (Table I and Fig. 1) were obtained from the following works and references therein: Sonntag et al. [7] from 300-120 eV, Wehenkel and Gauth6 [13] from 120-40 eV; Seignac and Robin [8] from 40-6 eV; Nestell and Christy [19] from 6-0.5eV; Weaver et al.[12] from 0.5-0.1eV. As a general rule we preferred data that were obtained "directly," for example, from R and T by inverting the Fresnel relations or from ellipsometry, which do not rely on extrapolations outside the measured spectrum. However, we also considered values derived from Kramers-Kronig analysis of reflectance [12] or electron-energy-loss spectra [13], based on a very wide energy range and accurate measurements: This ensured reliable results, which were in good agreement with the others in the overlapping regions. We have disregarded data that were insufficient and ambiguous, in terms of either the sample preparation and characterization or the measurement accuracy, especially when inexplicable or in clear disagreement with other researchers. This is particularly true in the IR region, where despite numerous ellipsometric measurements, we preferred the results of calorimetry [12], although limited to 0.1 eV.

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supporting

confidence: 65%

Vanadium (V)

Guizzetti¹,

Piaggi²

1997

Handbook of Optical Constants of Solids

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“…The conductivity data are obtained by Kramers-Kronig transform [13] [14,15]. This is appropriate since the UV transitions involve core levels, and are little inAuenced by environment or banding effects [13].…”

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Unconventional charge gap formation in FeSi

et al. 1993

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“…The backing mirror is assumed to be tantalum because of its applicability in ultra-high vacuum systems in combination with its fair reflectivity in the infrared [7,8].…”

Section: Angular Variation Of the Differential Reflectivitymentioning

confidence: 99%

The optimization of differential reflectometry at surfaces of transparent crystals

Akkerhuis

Silfhout

1985

Surface Science

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The first-order difference in reflectivity of crystals surfaces due to the adsorption of a (sub)monolayer is calculated for crystals transparent to the incident radiation. Conditions are derived for optimizing experimental studies of both strongly and weakly absorbing surfaces and/or adsorbates. The large and small absorption bandwidths involved correspond respectively to (i) electronic transitions to/from surface, interface and adsorbate states, and, (ii) vibrational excitations of adsorbates. The variable parameters are the angle of the incident light beam and the state of the back surface. It is found that the sensitivity varies with angle of incidence, depending on the type of absorbing monolayer.

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Optical Constants of Transition Metals in the Infrared*

Cited by 58 publications

References 0 publications

Vanadium (V)

Vanadium (V)

Unconventional charge gap formation in FeSi

The optimization of differential reflectometry at surfaces of transparent crystals

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