We demonstrate wideband all-order polarization mode dispersion (PMD) compensation by applying high-speed spectral polarization sensing and ultrafast pulse shaping techniques to characterize and correct the frequency-dependent Jones matrix associated with PMD of optical fibers on a wavelength-by-wavelength basis. We report full compensation of approximately 800 fs pulses distorted to more than 1...

In order to characterize the pollution discharged into the Moselle River and some of its tributaries, spectroscopic techniques, namely UV-vis spectroscopy and synchronous fluorescence spectroscopy, have been combined. UV-visible spectra were analysed using the maximum of the second derivative at 225 nm (related to nitrates), the SUVA254 and E2/E3 indices (related to the nature of organic matter...

Identifications of a large fraction previously unidentified lines in the complex spectrum low mass, late-type LMC [WC11] star J060819.93?715737.4 have been made utilizing electronic databases. There are an exceptionally number C ii emission originating from autoionizing (AI) levels. Resonance fluorescence between ground state and excited AI levels is shown to be important photoabsorption proces...

The ATP-induced enhancement of the intrinsic fluorescence of myosin and heavy meromyosin (HMM) that persists during the steady state of hydrolysis has been investigated. To compare the substrateinduced changes in fluorescence with those in the electron spin resonance spectrum of the spin-labeled enzyme, we studied the influence of temperature, pH, and ionic strength, as well as the effect of ch...

there are many different ways to subdivide the spectrum of a bounded linear operator; some of them aremotivated by applications to physics (in particular, quantum mechanics). in this study, the relationship betweenthe subdivisions of spectrum which are not required to be disjoint and goldberg's classification are given.moreover, these subdivisions for some summability methods are studied.

This article presents a laboratory–based hyperspectral imaging system designed and developed by the Instrumentation and Sensing Laboratory, U.S. Department of Agriculture, Beltsville, Maryland. The spectral range is from 430 to 930 nm with spectral resolution of approximately 10 nm (full width at half maximum) and spatial resolution better than 1 mm. Our system is capable of reflectance and flu...

The potential of fluorescence-detected circular dichroism (FDCD) to extend the scope of the exciton chirality method is rooted in the increased sensitivity and selectivity of fluorescence as compared with absorbance measurements. In this paper, several practical aspects of FDCD are addressed with model compounds possessing a (1R,2R)-trans-1,2-cyclohexanediol skeleton and two chromophores attach...

Every chemical species has its own unique spectral fingerprint, which can be used to identify new molecules, or to elucidate the chemical environment. However, as the environment becomes more complex it becomes increasingly difficult to distinguish a single species, or to determine characteristics of the environment. Two-dimensional fluorescence spectroscopy allows intuitive identification of d...

We have used the flavoenzyme p-hydroxybenzoate hydroxylase (PHBH) to illustrate that a strongly fluorescent donor label can communicate with the flavin via single-pair Förster resonance energy transfer (spFRET). The accessible Cys-116 of PHBH was labeled with two different fluorescent maleimides with full preservation of enzymatic activity. One of these labels shows overlap between its fluoresc...

The low temperature fluorescence spectra (4.2 K) of solid solutions of pditluorobenzene-h., (pDFB-h.,) and -& have been recorded and analyzed. The absence of fluorescence from vibrationally excited states at 4.2 K eliminates the sequence and “hot band” structure which complicate the analysis of the vapor fluorescence spectrum. On the basis of a comparison of our vibrational analysis with those ...