Results 31 to 40 of about 908,256 (325)

Calibration-Free WMS Using a cw-DFB-QCL, a VCSEL, and an Edge-Emitting DFB Laser With In-Situ Real-Time Laser Parameter Characterization

open access: yesIEEE Photonics Journal, 2017
This paper presents a detailed experimental wavelength modulation spectroscopy approach and demonstrates its applicability to various types of semiconductor lasers in the near infrared and mid-infrared.
Abhishek Upadhyay   +5 more
doaj   +1 more source

TDLAS Monitoring of Carbon Dioxide with Temperature Compensation in Power Plant Exhausts

open access: yesApplied Sciences, 2019
Temperature variations of flue gas have an effect on carbon dioxide (CO2) emissions monitoring. This paper demonstrates accurate CO2 concentration measurement using tunable diode laser absorption spectroscopy (TDLAS) with temperature compensation methods.
Xiaorui Zhu   +4 more
doaj   +1 more source

X-ray absorption spectroscopy [PDF]

open access: yesPhotosynthesis Research, 2009
This review gives a brief description of the theory and application of X-ray absorption spectroscopy, both X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), especially, pertaining to photosynthesis. The advantages and limitations of the methods are discussed.
Yano, Junko, Yachandra, Vittal K.
openaire   +4 more sources

Measurement of the Magnetic Field in a Linear Magnetized Plasma by Tunable Diode Laser Absorption Spectroscopy

open access: yesAtoms, 2019
Tunable diode laser absorption spectroscopy (TDLAS) is a commonly used technique to measure the temperature and density of atoms or molecules in a gas.
Sven Dickheuer   +7 more
doaj   +1 more source

Axisymmetric Linear Hyperspectral Absorption Spectroscopy and Residuum-Based Parameter Selection on a Counter Flow Burner

open access: yesEnergies, 2019
Chemical species tomography enables non-invasive measurements of temperatures and concentrations in gas phase processes. In this work, we demonstrate the recently introduced linear hyperspectral absorption tomography (LHAT) on an axisymmetric counterflow
Johannes Emmert   +4 more
doaj   +1 more source

Loss tolerant quantum absorption measurement

open access: yesNew Journal of Physics, 2020
The quantum statistics of entangled photon pairs promise greater performance for absorption measurements than can be achieved classically. However, the performance of a quantum approach is easily degraded under a loss of photons caused by experimental ...
Ryo Okamoto   +2 more
doaj   +1 more source

Efficient Semiclassical Dynamics for Vibronic Spectroscopy beyond Harmonic, Condon, and Zero-Temperature Approximations

open access: yesCHIMIA, 2021
Understanding light-induced processes in biological and human-made molecular systems is one of the main goals of physical chemistry. It has been known for years that the photoinduced dynamics of atomic nuclei can be studied by looking at the vibrational ...
Tomislav Begušić, Jirí Vaníček
doaj   +1 more source

Diagnostic Potential of Cosmic-Neutrino Absorption Spectroscopy [PDF]

open access: yes, 2004
Annihilation of extremely energetic cosmic neutrinos on the relic-neutrino background can give rise to absorption lines at energies corresponding to formation of the electroweak gauge boson $Z^{0}$.
A. Liddle   +17 more
core   +3 more sources

Patterns and Drivers of UV Absorbing Chromophoric Dissolved Organic Matter in the Euphotic Layer of the Open Ocean

open access: yesFrontiers in Marine Science, 2019
The global distribution of chromophoric dissolved organic matter (CDOM) in the euphotic layer of the Atlantic, Indian, and Pacific oceans (between 35° N and 40° S) was analyzed by absorption spectroscopy during the Malaspina 2010 circumnavigation ...
Francesca Iuculano   +8 more
doaj   +1 more source

Optical Absorption Cross-Section of DNA Bases—Thymine and Guanine—in the Energy Region from 3.1 to 250 eV (5–400 nm)

open access: yesQuantum Beam Science, 2020
(1) Background: Optical absorption cross-section—the absolute absorption intensity specific to each molecule—of nucleic acid bases enables us to estimate the reaction yields of DNA lesions induced by the exposure to not only photons but also ionizing ...
Kaveenga Rasika Koswattage   +2 more
doaj   +1 more source

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