DC-electric-field-induced optical second harmonic generation at the smooth metal-electrolyte interface

Aktsipetrov, O.A.; Melnikov, A. V.; Мурзина, Т. В.; Nikulin, A. A.; Rubtsov, A. N.

doi:10.1016/0039-6028(95)00485-8

Cited by 15 publications

(19 citation statements)

References 14 publications

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“…In addition, SHG experiments on silver electrodes (for which the free electron response largely dominates) show that the second harmonic intensity follows a quadratic dependence with a minimum value at the PZC 53,54 . This is attributed to the fact that, in this potential range, the second order susceptibility mainly originates from a third order term proportional to the static electric field across the interface, in other words to the surface charge or, equivalently, to the difference between the applied potential and the PZC (for which the total charge vanishes) 55 :…”

Section: Resultsmentioning

confidence: 99%

Enhanced Stability of a Carbon Monoxide Monolayer Adsorbed on Platinum under Electrochemical Control Probed by Sum-Frequency Generation Spectroscopy

2016

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We establish a new procedure to study the steady state adsorption of carbon monoxide (CO) at the surface of platinum under electrochemical control over a wide potential range in aqueous acidic solution. Using highly concentrated solutions of CO in perchloric acid medium enables the formation of a tightly packed and very stable CO monolayer at the surface of the metal, which allows cyclic voltammetry in the [-1200;+1500mV] potential range (vs Ag/AgCl). We use Sum-Frequency Generation (SFG) spectroscopy to show the unusual stability of the monolayer: going towards negative potentials, hydrogen evolution is first blocked then strongly quenched; towards positive potentials, CO oxidation is prevented as a consequence of its dense packing as a "frozen" monolayer. Diluting CO concentration by a factor of ten is enough to recover most of the usual properties of the CO/Pt(110) interface, still maintaining the high stability of the CO adlayer. Such a protocol can be applied to any problem for which CO poisoning mechanism has to be scrutinized or as a model of very stable electrochemical interfaces for fundamental studies.

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Section: Resultsmentioning

confidence: 99%

Enhanced Stability of a Carbon Monoxide Monolayer Adsorbed on Platinum under Electrochemical Control Probed by Sum-Frequency Generation Spectroscopy

2016

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“…22 The potential dependence of the second-harmonic intensity generated from rough silver surfaces (Figure 2 and refs 20 and 21) is in remarkable contrast with the observations from smooth silver surfaces in the same medium. 20,23 In general, the secondharmonic signal from a smooth silver surface follows the parabolic law, with a minimum that is close to the pzc.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Adsorption of l-Cysteine on a Polycrystalline Silver Electrode by Surface-Enhanced Raman Scattering (SERS) and Surface-Enhanced Second Harmonic Generation (SESHG)

2002

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The adsorption of L-cysteine (L-Cys) onto a polycrystalline silver electrode surface was investigated by in situ spectroelectrochemical methods. Surface-enhanced Raman spectroscopy (SERS) and surface-enhanced second-harmonic generation (SESHG) measurements were performed in a 0.2 M KCl solution in the presence and absence of L-Cys. The experimental results indicated that L-Cys strongly adsorbs onto silver and remains on the surface at potentials as negative as -900 mV (vs Ag/AgCl). A peak around -650 mV was observed in the SESHG intensity versus applied potential plots obtained in the presence of L-Cys. The peak was indicative of an abrupt change in the electronic properties of the interface at that potential. The SERS spectra at potentials more negative than ca. -650 mV showed an increase in the intensity of vibrational modes assigned to the carboxylate group of L-Cys. The combination of the SERS and the SESHG results suggests a potentialinduced reorientation of the adsorbed L-Cys molecules for potentials more negative than -650 mV. The data interpretation considered the different possible conformational forms of L-Cys adsorbed on the Ag surface. At potentials more positive than ca. -650 mV, L-Cys molecules adsorb with the protonated amino group pointing toward the surface. In this case, the positively charged amino group is stabilized by the coadsorbed chloride anions. The molecule changes its conformation at potentials more negative than -650 mV as the chloride ions leave the surface. The C R -C bond rotation brings the carboxylate group closer to the surface at these potentials.

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“…[2][3][4] Studies of surfaces and interfaces of condensed media belong to the regime of mesoscopic physics, where also quantum wells, -wires and -dots can be found. 5,6 Among the many nonlinear optical phenomena that has been studied in the regime of mesoscopic physics are (i) second harmonic generation from magnetic [7][8][9][10] as well as nonmagnetic [11][12][13][14][15][16][17][18][19] systems, (ii) sumand difference frequency generation, 16,20 of which one of the most prominent applications today is Sisyphus cooling of atoms, [21][22][23] (iii) photon drag, [24][25][26][27] (iv) DC-electric-field induced second harmonic generation, 28,29 (v) the second-order Kerr effect, 9,[30][31][32][33][34] (vi) electronic and vibrational surface Raman scattering, [35][36][37] (vii) two-photon photoemission, [38][39][40][41][42][43][44] (viii) generation of higher ...…”

Section: Introductionmentioning

confidence: 99%

Local-field study of phase conjugation in metallic quantum wells with probe fields of both propagating and evanescent character

Andersen

Keller

1999

Phys. Rev. B

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The phase conjugated response from nonmagnetic multi-level metallic quantum wells is analyzed and an essentially complete analytical solution is presented and discussed. The description is based on a semi-classical local-field theory for degenerate four-wave mixing in mesoscopic interaction volumes of condensed media developed by the present authors [T. Andersen and O. Keller, Phys. Scripta 58, 132 (1998)]. The analytical solution is supplemented by a numerical analysis of the phase conjugated response from a two-level quantum well in the case where one level is below the Fermi level and the other level is above. This is the simplest configuration of a quantum well phase conjugator in which the light-matter interaction can be tuned to resonance. The phase conjugated response is examined in the case where all the scattering takes place in one plane, and linearly polarized light is used in the mixing. In the numerical work we study a two-monolayer thick copper quantum well using the infinite barrier model potential. Our results show that the phase conjugated response from such a quantum-well system is highly dependent on the spatial dispersion of the matter response. The resonances showing up in the numerical results are analytically identified from the expressions for the linear and nonlinear response tensors. In addition to the general discussion of the phase conjugated response with varying frequency and parallel component of the wavevector, we present the phase conjugated response in the special case where the light is in resonance with the interband transition. AUTHOR PREPRINT. CONTENTS MAY CHANGE BEFORE PUBLICATION (3) −ω (z ′ ; q , ω), is related to the pump and probe fields by a constitutive relation of the form J (3) −ω (z; q , ω) =

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DC-electric-field-induced optical second harmonic generation at the smooth metal-electrolyte interface

Cited by 15 publications

References 14 publications

Enhanced Stability of a Carbon Monoxide Monolayer Adsorbed on Platinum under Electrochemical Control Probed by Sum-Frequency Generation Spectroscopy

Enhanced Stability of a Carbon Monoxide Monolayer Adsorbed on Platinum under Electrochemical Control Probed by Sum-Frequency Generation Spectroscopy

Investigation of the Adsorption of l-Cysteine on a Polycrystalline Silver Electrode by Surface-Enhanced Raman Scattering (SERS) and Surface-Enhanced Second Harmonic Generation (SESHG)

Local-field study of phase conjugation in metallic quantum wells with probe fields of both propagating and evanescent character

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