The Absorption of Light by Noble Metals and its Relation to the van der Waals Contribution to the Cohesive Energy

Friedel, J.

doi:10.1088/0370-1301/65/10/303

Cited by 51 publications

(14 citation statements)

References 12 publications

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“…We assume that the number of s electrons per atom remains a constant near to unity and only adds a small constant term to the cohesion. We shall also neglect secondary effects such as interatomic electrostatic [2], Van der Waals [3], and exchange terms [4] and ds mixing [5]. We shall introduce the spin-orbit coupling À J. s only to first order in perturbation [6], in which case it plays a role in the energy of free atoms but not in that of the metals, where the orbital moment is frozen to first order [7].…”

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confidence: 99%

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On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals

1977

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confidence: 99%

“…3a). It is strictly valid for the band of figure 2 ; but a systematic use of equations (3) and (7) and of the moments of n(E) shows that E° never deviates very much from this parabolic approximation [I], [10]: it is not very sensitive to the detailed variation of n(E), because it is an integral property of n(E). [20].…”

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confidence: 99%

On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals

1977

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“…We have found that the absorptances still slightly increase at thickness of 60 and 75 nm, where however the SALDI‐MS signals fall off rapidly by about two orders of magnitude. The absorption of light in gold is associated with two ways: plasmon excitation and electronic transition between d shell and conduction band 21. It is known that the electron mean free path is approximately 50 nm in gold 22.…”

Section: Resultsmentioning

confidence: 99%

“…The absorption of light in gold is associated with two ways: plasmon excitation and electronic transition between d shell and conduction band. [21] It is known that the electron mean free path is approximately 50 nm in gold. [22] When the thickness of the gold thin film is more than 50 nm, the excited electrons oscillating in the alternating field of the incident photon might encounter more scattering events with the lattice, and more energy will be transferred to the lattice as thermal energy.…”

Section: Uv-vis Absorption Analysismentioning

confidence: 99%

Surface-assisted laser desorption and ionization mass spectrometry using low-cost matrix-free substrates

Huo¹,

Shen²,

Ebstein³

et al. 2011

J. Mass Spectrom.

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Surface-assisted laser desorption/ionization (SALDI) substrates have been fabricated using nanospiked polyurethane (PU) substrates that are replicated by a low-cost soft nanolithography method from silicon nanospike structures formed with femtosecond laser irradiations. The strongest mass spectrometry (MS) signal of Angiotensin II was obtained on 45-nm Au-coated nanospiked PU substrates. The effective ionization appears to be due to surface plasmon excitation. Such low-cost and identical SALDI substrates can be used for MS analysis of various molecules with high reproducibility.

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“…( a and b denote the two sites). We also consider a mixed expression 0 = ( IS,( 1) Is, (2) 1 e 2 h 21 Is, (1 ) 1 sb(2)).…”

Section: Reduction Of Ueff Due To Interatomic Coulomb Interactionsmentioning

confidence: 99%

Some considerations on U_eff values entering the hubbard hamiltonian

Friedel¹,

Noguera²

1983

Int J of Quantum Chemistry

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One of the simplest ways to take into account correlations between electrons in solid state physics, beyond the usual one electron approximation, is to use the Hubbard HamiltonianAlthough it corresponds to very severe approximations, since intersite correlations are neglected, and since the whole problem is reduced to a single parameter U , it is already very difficult to solve, and exact solutions exist in only a few cases. It is thus not desired to introduce more complications in the Hamiltonian; but it could be interesting to understand, at least qualitatively, which processes influence the value taken by parameter U. The question arises in concrete cases, such as transition metals or organic molecules; comparing experiments and approximate solutions of the Hubbard Hamiltonian has shown that, in most cases, the value of U that yields the best fit is very different from what would be expected from atomic considerations.For instance, if one wants to study correlations on atoms of type M , a pure atomic point of view would affect to U the change in energy U,, in the redox-type equationHowever it seems that solid state effects play an important role and we discuss, in this paper, three of them: (i) the finite time that one electron spends on a given atom due to the delocalization of the electrons in a band (effect of pi, which increases U relatively to Uat); (ii) the mixing of bands of different orbital character which allow two electrons not to be on the same orbital of an atom (and thus decreases U ) ; and (iii) the existence of Coulomb repulsion between electrons on neighboring sites which reduces their effective exclusion on the same site.

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The Absorption of Light by Noble Metals and its Relation to the van der Waals Contribution to the Cohesive Energy

Cited by 51 publications

References 12 publications

On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals

On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals

Surface-assisted laser desorption and ionization mass spectrometry using low-cost matrix-free substrates

Some considerations on U_eff values entering the hubbard hamiltonian

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The Absorption of Light by Noble Metals and its Relation to the van der Waals Contribution to the Cohesive Energy

Cited by 51 publications

References 12 publications

On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals

On the role of d-d electron correlations in the cohesion and ferromagnetism of transition metals

Surface-assisted laser desorption and ionization mass spectrometry using low-cost matrix-free substrates

Some considerations on Ueff values entering the hubbard hamiltonian

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Some considerations on U_eff values entering the hubbard hamiltonian