Vibrational overtone absorption of interfacial hydrogen in porous Vycor glass

Huber, T. E.; Ca, Huber

doi:10.1103/physrevb.40.12527

Cited by 8 publications

(2 citation statements)

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“…A surface-induced dipole on an adsorbed molecule is a well-known phenomenon that can be experimentally studied, even for quadrupolar molecules such as dihydrogen, by observing the emergence of infrared absorption at the solid-gas interface. 15 As most metals exhibit plasmon frequencies in the visible and ultraviolet, we seek metallic systems with low-frequency plasmon modes near the fundamental vibrational frequency for ground-state dihydrogen (X 1 Σ g 1 , 4395 cm -1 ) 0.545 eV) 16 and will rely on the metal surface to induce a vibrational dipole between this frequency and its overtones.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to electronic transitions, we are interested in examining vibrational energies associated with surface-induced dipole interactions of dihydrogen which are degenerate (or nearly so) with the surface plasmon frequency in the absence of an external electric field. A surface-induced dipole on an adsorbed molecule is a well-known phenomenon that can be experimentally studied, even for quadrupolar molecules such as dihydrogen, by observing the emergence of infrared absorption at the solid−gas interface . As most metals exhibit plasmon frequencies in the visible and ultraviolet, we seek metallic systems with low-frequency plasmon modes near the fundamental vibrational frequency for ground-state dihydrogen (X 1 Σ g 1 , 4395 cm -1 = 0.545 eV) and will rely on the metal surface to induce a vibrational dipole between this frequency and its overtones.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Low-Frequency Plasmons in Molecular Adsorption: A Theoretical and Spectroscopic Study of Gold and Titanium Compounds

Miller

Merrill

2008

J. Phys. Chem. C

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We explore the question of whether surface plasmons arising from metallic nanostructures can be used advantageously to affect binding interactions of adsorbed molecules, specifically, the adsorption of dihydrogen leading to enhanced binding energies under ambient conditions. To begin to address this question, we report a systematic, theoretical survey of the plasmon spectra of gold (AuLi, AuNa 2 , AuB 2 , AuAl 2 , AuGa 2 , and AuIn 2 ) and titanium (TiB 2 ) compounds, examining closely the low-frequency characteristics of these spectra in relation to crystal structure. First-principle calculations of the real and imaginary components of the dielectric function were performed, and the energy-loss function was derived. These calculations show that most of the compounds give rise to low-intensity, plasmon-like modes at low frequencies and can be attributed to interband transitions between states lying close to the Fermi level. We further determined experimentally whether these plasmon-like modes are excited at low frequencies from clusters of two gold compounds (AuLi and AuAl 2 ) by measuring surface-enhancement effects in the near-infrared Raman spectrum. Strong surface-enhancement effects were indeed observed, and we report the first observation of near-infrared, surface-enhanced Raman from compounds of this kind.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%