Self-Diffusion on Pd(111) from the Point of View of the Band Model of Diffusion

Banik, I.; Lukovičová, Jozefa; Pavlendová, Gabriela

doi:10.4028/www.scientific.net/ddf.353.292

Cited by 2 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In transverse excitation, the relative contributions of ERS and SERS scale by the spectral dependence of scattering and β, as discussed above. The clearest signature of ERS is the anti-Stokes branch of the continuum, which decays exponentially as a function of Raman shift. − It perfectly fits the Fermi–Dirac distribution of hole states, which serve as the thermally occupied terminal states in ERS (see Figure ii). The fit of the anti-Stokes ERS to the Fermi Dirac distribution yields the temperature of the nantenna, and its dependence on excitation intensity yields the heating rate, which limits the tolerable average irradiation intensity (see below).…”

Section: Systemmentioning

confidence: 93%

Ultrafast Coherent Raman Scattering at Plasmonic Nanojunctions

et al. 2016

View full text Add to dashboard Cite

Surface-enhanced coherent anti-Stokes Raman scattering (SECARS) measurements carried out on individual nanosphere dimer nantennas are presented. The ν-domain and t-domain CARS measurements in the few-molecule limit are contrasted as vibrational autocorrelation and cross-correlation, respectively. We show that in coherent Raman spectroscopies carried out with ultrashort pulses, the effect of surface enhancement is to saturate stimulated steps at very low incident intensities (100 fJ in 100 fs pulses), and the principal consideration in sensitivity is the effective quadratic enhancement of spontaneous emission cross sections, σ* = (E L /E o ) 2 σ. Through multicolor femtosecond SECARS measurements we show that beside enhancement factors, an effective plasmon mode matching consideration controls the interplay between coherent electronic Raman scattering on the nantenna and vibrational Raman scattering on its molecular load. Through extensive measurements on individual nantennas, we establish the tolerable average and peak intensities that can be used in ultrafast measurements at nanojunctions, and we highlight a variety of plasmon-driven chemical and physical channels of signal and sample degradation.

show abstract

Section: Systemmentioning

confidence: 93%

Ultrafast Coherent Raman Scattering at Plasmonic Nanojunctions

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Let us now restrict our attention to the aS background of the SER spectra in Figure . SERS background arises mostly from inelastic light scattering off electrons in the plasmonic metal. − Other factors, like molecular vibrations or photoluminescence, also contribute to the background, yet they are of secondary importance in our case. The reader is referred to the work of Mahajan et al that explains the contribution of molecular vibrations to the SERS background (which is evident in the Stokes part of the spectra), and to the papers by Huang et al and Liu et al that explain how luminescence arises in plasmonic nanostructures.…”

mentioning

confidence: 99%

“…It was also observed (but not commented) by Hugall and Baumberg (see Figure b in ref ), who used continuous wave illumination at 785 nm. On the contrary, a strictly single-exponential aS background was observed by Xie et al on arrays of plasmonic nanostructures, and by Banik on a single nanodumbell . Understanding and quantification of the extra component in the aS background is a matter of current debate in the field.…”

mentioning

confidence: 99%

Plasmon-Driven Photocatalysis Leads to Products Known from E-beam and X-ray-Induced Surface Chemistry

et al. 2018

View full text Add to dashboard Cite

Plasmonic metal nanostructures can concentrate incident optical fields in nanometersized volumes, called hot spots. This leads to enhanced optical responses of molecules in such a hot spot, but also to chemical transformations, driven by plasmon-induced hot carriers. Here, we employ tip-enhanced Raman spectroscopy (TERS) to study the mechanism of these reactions in situ, at the level of a single hot spot. Direct spectroscopic measurements reveal the energy distribution of hot electrons, as well as the temperature changes due to plasmonic heating. Therefore, charge-driven reactions can be distinguished from thermal reaction pathways. The products of the hot-carrierdriven reactions are strikingly similar to the ones known from x-ray or e-beam-induced surface chemistry, despite the >100-fold energy difference between visible and x-ray photons. Understanding the analogies between those two scenarios implies new strategies for rational design of plasmonic photocatalytic reactions and for the elimination of photoinduced damage in plasmon-enhanced spectroscopy.

show abstract

Self-Diffusion on Pd(111) from the Point of View of the Band Model of Diffusion

Cited by 2 publications

References 20 publications

Ultrafast Coherent Raman Scattering at Plasmonic Nanojunctions

Ultrafast Coherent Raman Scattering at Plasmonic Nanojunctions

Plasmon-Driven Photocatalysis Leads to Products Known from E-beam and X-ray-Induced Surface Chemistry

Contact Info

Product

Resources

About