Get the Basics Right: Jacobian Conversion of Wavelength and Energy Scales for Quantitative Analysis of Emission Spectra

Mooney, Jonathan; Kambhampati, Patanjali

doi:10.1021/jz401508t

Cited by 331 publications

(255 citation statements)

References 7 publications

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“…The fluorescence spectra were transformed to the natural units of energy 41 for further analysis since wide peaks can become significantly distorted when spectra are displayed as a function of wavelength (see Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

Fluorescence from Molecular Silver Nanoparticles

Ashenfelter¹,

Desireddy²,

Yau

et al. 2015

J. Phys. Chem. C

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Small metal nanoparticles are known to be much more fluorescent than larger plasmonic nanoparticles, however the nature and origin of their fluorescence are not fully understood. Fluorescence is thought to originate from either the quantum states within the metal core or mixed ligand states at the inorganic-organic interface. Here we show that fluorescence from molecular silver glutathionate nanoparticles has its origin in interfacial electronic states. Fluorescence spectra were found to be independent of size, with very similar wavelength and bandwidth, although the quantum yield was not. Excitation spectra indicated that the strongest fluorescence had its origin in that part of the spectrum that is dominated by ligand-related states. Further, excitations to strictly core states and to higher lying d-band states had no apparent contribution to the fluorescence. Timeresolved spectroscopic measurements showed that Ag32(SG)19 and Ag15(SG)11 have a common emissive state, with the same emission wavelength and dynamic, which can be assigned to the metal-ligand state.

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Section: Resultsmentioning

confidence: 99%

Fluorescence from Molecular Silver Nanoparticles

Ashenfelter¹,

Desireddy²,

Yau

et al. 2015

J. Phys. Chem. C

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“…The presentation of the spectral functions in this form (o À 2 s(o) versus ' o, or photon energy) requires comment 56,57 . We offer three reasons for this choice.…”

Section: Methodsmentioning

confidence: 99%

Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster

et al. 2014

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Absorption spectra of very small metal clusters exhibit individual peaks that reflect the discreteness of their localized electronic states. With increasing size, these states develop into bands and the discrete absorption peaks give way to smooth spectra with, at most, a broad localized surface-plasmon resonance band. The widely accepted view over the last decades has been that clusters of more than a few dozen atoms are large enough to have necessarily smooth spectra. Here we show through theory and experiment that for the ubiquitous thiolate cluster compound Au 144 (SR) 60 this view has to be revised: clearly visible individual peaks pervade the full near-IR, VIS and near-UV ranges of low-temperature spectra, conveying information on quantum states in the cluster. The peaks develop well reproducibly with decreasing temperature, thereby highlighting the importance of temperature effects. Calculations using time-dependent density-functional theory indicate the contributions of different parts of the cluster-ligand compound to the spectra.

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“…The above points are shown in Figure 4 depicting the de-convolution of the overall kinetic energy distribution into three different components. For this purpose, we have converted velocity into energy distributions applying the appropriate Jacobian, namely P(v)dv = P(E)dE [27].…”

Section: Resultsmentioning

confidence: 99%

MD simulations of He evaporating from dodecane

Williams

Koehler

2015

Chemical Physics Letters

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a b s t r a c tThe velocity distribution of He atoms evaporating from a slab of liquid dodecane has been simulated. The distribution composed of ∼10 000 He trajectories is shifted to fractionally faster velocities as compared to a Maxwell-Boltzmann distribution at the temperature of the liquid dodecane with an average translational energy of 1.05 × 2RT (or 1.08 × 2RT after correction for a cylindrical liquid jet), compared to the experimental work by Nathanson and co-workers (1.14 × 2RT) on liquid jets. Analysis of the trajectories allows us to infer mechanistic information about the modes of evaporation, and their contribution to the overall velocity distribution.

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Get the Basics Right: Jacobian Conversion of Wavelength and Energy Scales for Quantitative Analysis of Emission Spectra

Cited by 331 publications

References 7 publications

Fluorescence from Molecular Silver Nanoparticles

Fluorescence from Molecular Silver Nanoparticles

Information on quantum states pervades the visible spectrum of the ubiquitous Au144(SR)60 gold nanocluster

MD simulations of He evaporating from dodecane

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