This paper presents data from the BIMA interferometer showing spatially resolved absorption spectra of the gravitationally lensed quasar PKS 1830-211. High-resolution (1.2 km s) spectra were taken in two spectral windows centered on the redshifted frequencies of the HCO(2 ← 1) and HCN(2 ← 1) molecular transitions. There is no molecular absorption in the northeast image but the southwest image r...

Removing effects of sample heterogeneity through single-molecule and single-particle techniques has advanced many fields. While background free luminescence and scattering spectroscopy is widely used, recording the absorption spectrum only is rather difficult. Here we present an approach capable of recording pure absorption spectra of individual nanostructures. We demonstrate the implementation...

Recent investigations give an optimistic view that infrared absorption spectra can be very useful in the rapid identification and differentiation of microorganisms. However, it is admitted that such identifications will have to be based on very small differences, often not much above the reproducibility with which the spectra can be measured. Blout and Lenormant (1953) compared the spectra of L...

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Tbe doped Calcium alumino silicate (CaAl2Si2O8) phosphor was synthesized by combustion method at initiating temperature of 7000C, using urea as a reducer. XRD, Thermoluminescences, absorption spectra, FTIR and Thermoluminescences spectra were recor...

In the analysis of broad absorption line (BAL) quasar spectra , Keck HIRES spectra are a useful complement to lower resolution HST and ground based spectra. The HIRES spectra provide accurate parameters for narrow, intervening type absorption systems including Lyman limit systems and a direct measurement of the smoothness of BAL features. The smoothness of the troughs is related to the number o...

Attempts to produce colloidal platinum nanoparticles by using steady absorption spectra with various chemical-based reduction methods often resulted in the fast disappearance of the absorption maxima leaving reduced platinum nanoparticles with little information on their optical properties. We synthesized colloidal platinum nanoparticles in an aqueous solution of polyvinyl pyrrolidone by gamma ...

Absorption spectra and light-induced absorbance changes of crystals from Rhodopseudomonas viridis reaction centers are recorded. A theoretical analysis of the absorption and circular dichroism spectra is presented, yielding a consistent picture of spectroscopic and structural information.

background: similar to the thermoluminescence (tl) spectra, the optical parameters variations can also be used in tl crystals for dosimetry purposes. these optical parameters can include absorption, transmission and reflection coefficients. materials and methods: single crystals of kbr and kcl which have been used in this research were grown from laboratory grade extra pure precursor powders. c...

Although visible and near-infrared reflectance spectra contain absorption bands that are characteristic of the composition and structure of the absorbing species, deconvolving a complex spectrum is nontrivial. An improved approach to spectral deconvolution is presented here that accurately represents absorption bands as discrete mathematical distributions and resolves composite absorption featu...

A spectral database of 100 attenuated total reflectance Fourier transform infrared spectra is created. The software IRSS previously developed in our lab is used to perform spectral search in the database. Despite the slight difference between the absorption and ATR FT-IR spectra, the comprehensive test search sessions of ATR spectra in IR libraries and vice versa (absorption spectra searched in...