It formalizes the relationship between the estimation of spectral lines and sparse approximation, insisting on the specificities of the model, caused notably by the irregular nature of the sampling scheme. The chapter analyzes and compares several iterative (greedy) methods, and presents techniques ...
various spectral components, which is termed subband coding, and frequency bands are divided in half by the high-pass and low-pass filters in the decomposition process, we can apply one level of decomposition and take just the first approximation (coefficients a1[n]) for the reconstruction ...
Resonance Raman spectra have been obtained from the MnO4- and CrO42- ions in aqueous solutions and as solid. High intensity overtone progressions of the to... W Kiefer,HJ Bernstein - 《Molecular Physics》 被引量: 178发表: 1972年 Temperature dependence of the Raman OH‐stretching overtone from...
The observed profiles are considerably self-reversed, and an accurate approximation to the actual line profiles using the sum of two equal and offset Gaussian profiles is presented. The set of observations, though sparse, cover the period of time from 1975 to 1985. The solar cycle variation of...
(ter Braak 2006;2008). We found, in general, that these approaches agreed when the data were "good"--even optimal estimation (with its gaussian posterior approximation, like any non-linear minimizer)--but disagreed when the data were sparse (low wavelength coverage, low SNR etc.)--...
Interestingly, we also see in figure 7 that the spectra of the lower bound (in blue) and of the upper bound (in orange) agree for the maximal possible value of ∆[0,0] for our Λ. Hence, this suggests that the spectrum of the theory at the right tip of the allowed "triangle" ...
The spectra of many Seyfert galaxies display broad Fe K 伪 emission. The line profile has two maxima, suggesting that the line emerges in the innermost regions of an accretion disk around a black hole, making it necessary to take into account general relativistic (GR) effects. Identifying GR ...
Theory of Line Intensities in the Combination Scattering Spectra. 1. Quantum Model {(Condon} Approximation)Krushinsky, L LShorygin, P P
Electronic absorption and resonance Raman spectra are studied for the case in which a sparse manifold of radiatively bright zeroth-order states is non-radiatively coupled to a dense manifold of dark states. In particular, a time-domain approach to the computation of the resonance lineshapes induced...
The spectrometer measures the spontaneous emission spectra in terms of photon counts with respect to the wavelength. The photo counts reflect the relative spectral intensity distribution and are calibrated to the absolute intensities. This can be achieved via a blackbody furnace, from which coefficients...