Topic
Fourier transform spectroscopy
About: Fourier transform spectroscopy is a research topic. Over the lifetime, 5418 publications have been published within this topic receiving 134133 citations.
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TL;DR: It is shown that the absorption bandgap inhomogeneity is robustly determined by the slope of the nodal line separating positive and negative peaks in the 2D spectrum around the bandgap transition; this nodsal line slope is independent of excited state parameters not known from the absorption and emission spectra.
Abstract: Femtosecond two-dimensional Fourier transform spectroscopy is used to determine the static bandgap inhomogeneity of a colloidal quantum dot ensemble. The excited states of quantum dots absorb light, so their absorptive two-dimensional (2D) spectra will typically have positive and negative peaks. It is shown that the absorption bandgap inhomogeneity is robustly determined by the slope of the nodal line separating positive and negative peaks in the 2D spectrum around the bandgap transition; this nodal line slope is independent of excited state parameters not known from the absorption and emission spectra. The absorption bandgap inhomogeneity is compared to a size and shape distribution determined by electron microscopy. The electron microscopy images are analyzed using new 2D histograms that correlate major and minor image projections to reveal elongated nanocrystals, a conclusion supported by grazing incidence small-angle X-ray scattering and high-resolution transmission electron microscopy. The absorption...
36 citations
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TL;DR: In this paper, Fourier transform infrared measurements of bromine nitrate have been performed in the spectral region 675-1400 cm−1 at 0.014-1 spectral resolution.
36 citations
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TL;DR: In this article, the organic material 4-nitrobenzaldehyde single crystal has been grown using the single wall ampoule with nano-translation by modified vertical Bridgman technique.
36 citations
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TL;DR: In this article, the effects of hydrogen and nitrogen on the spectra of a number of elements (Fe, Ti, V, Ni, Zn etc) have been investigated and it has been shown that asymmetric charge transfer involving hydrogen ions (H-ACT) is a very important selective excitation mechanism for spectral lines with a total excitation energy close to 13.6 eV.
36 citations
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TL;DR: In this paper, a fast isotopic transient kinetic analysis (ITKA) was performed in which both the gaseous and adsorbed species inside the catalytic reactor were monitored simultaneously with rapid-scan transmission Fourier transform infrared (FTIR), and its gaseus effluent can be monitored by mass spectroscopy during rapid switching of reagent gas streams.
Abstract: A novel apparatus for gas phase heterogeneous catalysis kinetics is described. The apparatus enables fast isotopic transient kinetic analysis (ITKA) to be performed in which both the gaseous and adsorbed species inside the catalytic reactor are monitored simultaneously with rapid-scan transmission Fourier transform infrared (FTIR), and its gaseous effluent can be monitored by mass spectroscopy during rapid switching of reagent gas streams. This enables a more powerful version of the well-known steady-state isotopic transient kinetic analysis (SSITKA) technique in which the vibrational spectra of the gas phase and adsorbed species are also probed: FTIR-SSITKA. Unique reactor characteristics include tungsten construction, liquid nitrogen cooling or heating (∼200–770K), pressures of 1.0–2.5atm, fast reactor disassembly and reassembly, and catalyst loading in a common volume. The FTIR data acquisition rate of this apparatus (3Hz) is tenfold faster than previously reported instruments. A 95% signal decay time ...
36 citations