How Does Light Absorption Intensity Depend on Molecular Size?

Light, Linda B.; Huebner, Jay S.; Vergenz, Robert A.

doi:10.1021/ed071p105

Cited by 3 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taking ρ = 1000 kg/m 3 , n = 1.5, n 0 = 1.3 and D = 0.5 nm shows that in a molecular solution, σ is very small, <10 −5 L/g/m over the entire visible spectrum. This is much smaller than values of α typically found for molecular systems 15 , allowing σ to be neglected in such systems and leading to the common misconception that extinction and absorption are interchangeable.…”

Section: Introductionmentioning

confidence: 86%

Non-resonant light scattering in dispersions of 2D nanosheets

et al. 2018

View full text Add to dashboard Cite

Extinction spectra of nanomaterial suspensions can be dominated by light scattering, hampering quantitative spectral analysis. No simple models exist for the wavelength-dependence of the scattering coefficients in suspensions of arbitrary-sized, high-aspect-ratio nanoparticles. Here, suspensions of BN, talc, GaS, Ni(OH)2, Mg(OH)2 and Cu(OH)2 nanosheets are used to explore non-resonant scattering in wide-bandgap 2D nanomaterials. Using an integrating sphere, scattering coefficient (σ) spectra were measured for a number of size-selected fractions for each nanosheet type. Generally, σ scales as a power-law with wavelength in the non-resonant regime: σ(λ)∝[λ/〈L〉]−m, where 〈L〉 is the mean nanosheet length. For all materials, the scattering exponent, m, forms a master-curve, transitioning from m = 4 to m = 2, as the characteristic nanosheet area increases, indicating a transition from Rayleigh to van der Hulst scattering. In addition, once material density and refractive index are factored out, the proportionality constant relating σ to [λ/〈L〉]−m, also forms a master-curve when plotted versus 〈L〉.

show abstract

Section: Introductionmentioning

confidence: 86%

Non-resonant light scattering in dispersions of 2D nanosheets

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This wavelength matches the energy gap between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels as calculated with density-functional theory. Using a standard method [16], we find the absorption cross section of the molecule to be about 0:33 Â 10 À16 cm 2 . The fluence used in this study is one that ultimately leads to the DHP molecule rather than the trans isomer or dissociated products.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of the photocyclization ofcis-stilbene to dihydrophenanthrene

Dou

Allen

2004

Journal of Modern Optics

View full text Add to dashboard Cite

Abstract.Semiclassical simulations are reported for the dynamics of the photocyclization of cis-stilbene, leading to the formation of 4a,4b-dihydrophenanthrene. Photo-excited cis-stilbene rotates about its vinyl and vinyl-phenyl bonds simultaneously. The structural changes result in a series of strong couplings between the highest occupied molecular orbital and the lowest unoccupied molecular orbital. These couplings cause the formation of a new chemical bond between the two phenyl rings of stilbene. The length changes of different C-C bonds, corresponding to the formation of the new molecule, are presented and discussed in detail.

show abstract