Results 31 to 40 of about 922,402 (315)
Intensity dependent deflection spectroscopy for absorption measurements [PDF]
EPJ Web of Conferences, 2020 We report on a method for the characterization of optical absorption in semiconductors at photon energies below the bandgap energy. We use intensity dependent deflection spectroscopy to measure spatially resolved the optical absorption and to separate ...
Dickmann Walter +3 more
doaj +1 more source
From Chitosan to Chitin: Bio‐Inspired Thin Films for Passive Daytime Radiative Cooling
Advanced Science, 2023 Passive radiative daytime cooling is an emerging technology contributing to carbon‐neutral heat management. Optically engineered materials with distinct absorption and emission properties in the solar and mid‐infrared range are at the heart of this ...
Tobias Lauster +6 more
doaj +1 more source
Resolving nonuniform temperature distributions with single-beam absorption spectroscopy. Part II: Implementation from broadband spectra [PDF]
Journal of Quantitative Spectroscopy and Radiative Transfer, 2021, 2020 Several past studies have described how absorption spectroscopy can be used to determine spatial temperature variations along the optical path by measuring the unique, nonlinear response to temperature of many molecular absorption transitions and performing an inversion. New laser absorption spectroscopy techniques are well-suited to this nonuniformity
arxiv +1 more source
Magnetoexcitons and optical absorption of bilayer-structured topological insulators [PDF]
Appl. Phys. Lett. 100, 161602 (2012), 2012 Optical absorption properties of magnetoexcitons in topological insulator bilayers under a strong magnetic field are theoretically studied. A general analytical formula of optical absorption selection rule is obtained in the noninteracting as well as Coulomb intra-Landau-level interacting cases, which remarkably helps to interpret the resonant peaks in
arxiv +1 more source
Soliton absorption spectroscopy
, 2010 We analyze optical soliton propagation in the presence of weak absorption lines with much narrower linewidths as compared to the soliton spectrum width using the novel perturbation analysis technique based on an integral representation in the spectral ...
A. Biswas +10 more
core +2 more sources
Bulk sensitive x-ray absorption spectroscopy free of self-absorption effects [PDF]
Phys. Rev. B 83, 081106(R) (2011), 2010 We demonstrate a new method of x-ray absorption spectroscopy (XAS) that is bulk sensitive, like traditional fluorescence yield measurements, but is not affected by self-absorption or saturation effects. This measure of XAS is achieved by scanning the incident photon energy through an absorption edge and using an energy sensitive photon detector to ...
arxiv +1 more source
Baseline-free Quantitative Absorption Spectroscopy Based on Cepstral Analysis [PDF]
Optics Express 27(26), 37920-37939 (2019), 2019 The accuracy of quantitative absorption spectroscopy depends on correctly distinguishing molecular absorption signatures in a measured transmission spectrum from the varying intensity or "baseline" of the light source. Baseline correction becomes particularly difficult when the measurement involves complex, broadly absorbing molecules or non-ideal ...
arxiv +1 more source
Dual-frequency Doppler-free spectroscopy for simultaneous laser stabilisation in compact atomic physics experiments [PDF]
, 2021 Vapour cell spectroscopy is an essential technique in many fields; in particular, nearly all atom and ion trapping experiments rely on simultaneous spectroscopy of two atomic transitions, traditionally employing separate apparatus for each transition.
arxiv +1 more source
Cavity-Enhanced Ultrafast Transient Absorption Spectroscopy
, 2015 We present a new technique using a frequency comb laser and optical cavities for performing ultrafast transient absorption spectroscopy with improved sensitivity.
Allison, Thomas K. +2 more
core +1 more source
Inverse modelling on the basis of remote sensing to determine emission rates
Meteorologische Zeitschrift, 1998 Inverse modelling with a Gaussian dispersion model is used to determine emission rates of diffuse sourees. The path-integrated gaseous concentrations of an exhaust are measured downwind of the source by FTIR absorption spectroscopy.
Klaus Schäfer +12 more
doaj +1 more source