The excited states of UV-B absorbers, ethylhexyl triazone (EHT) and diethylhexylbutamido triazone (DBT), have been studied through measurements of UV absorption, fluorescence, phosphorescence, triplet-triplet absorption and electron paramagnetic resonance spectra in ethanol. The energy levels of the lowest excited singlet (S1) and triplet (T1) states and quantum yields of fluorescence and phosp...

In recent years, some sapphires were found to fade in sunlight and increase their color after UV irradiation. This unstable phenomenon is attributed the photochromism of corundum. The photochromic effect seriously affects grading evaluation sapphires, although its mechanism still uncertain. Here, we performed a set experiments on sapphire specimens using 254 nm shortwave light source D65 (which...

Recent advances in the development of the atmospheric correction models made the retrieval of surface reflectance spectra of coastal waters from the top of atmosphere signals more accurate and inspired the further development of the coastal retrieval algorithms. This includes algorithms which employ the red and NIR bands and which are less sensitive to the absorption of the colored dissolved or...

The Cover Feature manifests 2D carbon Mobius nanomaterials are of strong optical absorption, fluorescence, and chirality. This is revealed by linear polarized circular electronic dichroism, fluorescence spectra. Furthermore, electron-hole coherence on transitions transition density matrix. More information can be found in the Research Article Ning Li Mengtao Sun.

Diffuse reflectance and fluorescence spectroscopy are popular research techniques for noninvasive disease diagnostics. Most systems include an optical fiber probe that transmits and collects optical spectra in contact with the suspected lesion. The purpose of this study is to investigate probe pressure effects on human skin spectroscopic measurements. We conduct an in-vivo experiment on human s...

Detailed photophysical properties of cyano and mono (MA)/bis alkoxy (DA) substituted diphenylacetylene moieties with different alkyl chain lengths (methyl (1), octyl (8) and dodecyl (12)) were investigated in solution and the solid state in an effort to determine the effect of self-aggregation on these properties. The solvated molecules showed a minimal bathochromic shift with an increase of so...

Surface-enhanced infrared absorption spectroscopy has attracted increased attention for direct access to molecular vibrational fingerprints in the mid-infrared. Perfect-absorber metamaterials (PAMs) with multi-band spectral responses and significant enhancement of the local near-field intensity were developed to improve the intrinsic absorption cross sections of absorption spectrum to identify ...

If robust spectroscopic techniques are to be developed for the detection and identification of pathogens, one must understand the relevant spectroscopic properties of the target molecules. In this paper, we employ density functional theory (DFT) to study the structural, electronic, vibrational, optical, and magnetic properties of dipicolinic acid (DPA) and its dianion DPA . Our full geometrical...

Green fluorescent proteins bearing the Y66H mutation exhibit strongly blue-shifted fluorescence excitation and emission spectra. However, these blue fluorescent proteins (BFPs) have lower quantum yields of fluorescence (Phi(f) approximately 0.20), which is believed to stem from the increased conformational freedom of the smaller chromophore. We demonstrate that suppression of chromophore mobili...