Vibration-rotational interaction and doublet structure of the 390-cm-1quasi line in the fluorescence spectrum of anthracene vapors

2000 ◽  
Author(s):  
Yu. S. Demchuk ◽  
E. A. Vandyukov
Keyword(s):  
Fluorescence Spectrum ◽  
Doublet Structure ◽  
Rotational Interaction

Chloroplast Ultrastructure and Emission Fluorescence Spectrum Characteristics for Stems of Phyllostachys pubescens

2014 ◽  
Vol 48 (6) ◽  
pp. 635-642
Author(s):  
Chen Dengju ◽  
Gao Peijun ◽  
Wu Xingbo ◽  
Gao Yan ◽  
Wen Guosheng ◽  
...  
Keyword(s):  
Fluorescence Spectrum ◽  
Chloroplast Ultrastructure ◽  
Phyllostachys Pubescens ◽  
Spectrum Characteristics

scholarly journals Retrieving Sun-Induced Chlorophyll Fluorescence from Hyperspectral Data with TanSat Satellite

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4886
Author(s):  
Shilei Li ◽  
Maofang Gao ◽  
Zhao-Liang Li
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fluorescence Spectrum ◽  
Singular Vector ◽  
Low Frequency ◽  
Information Criterion ◽  
Hyperspectral Data ◽  
High Spectral Resolution ◽  
Remotely Sensed Data ◽  
Spectral Window ◽  
Vector Decomposition

A series of algorithms for satellite retrievals of sun-induced chlorophyll fluorescence (SIF) have been developed and applied to different sensors. However, research on SIF retrieval using hyperspectral data is performed in narrow spectral windows, assuming that SIF remains constant. In this paper, based on the singular vector decomposition (SVD) technique, we present an approach for retrieving SIF, which can be applied to remotely sensed data with ultra-high spectral resolution and in a broad spectral window without assuming that the SIF remains constant. The idea is to combine the first singular vector, the pivotal information of the non-fluorescence spectrum, with the low-frequency contribution of the atmosphere, plus a linear combination of the remaining singular vectors to express the non-fluorescence spectrum. Subject to instrument settings, the retrieval was performed within a spectral window of approximately 7 nm that contained only Fraunhofer lines. In our retrieval, hyperspectral data of the O2-A band from the first Chinese carbon dioxide observation satellite (TanSat) was used. The Bayesian Information Criterion (BIC) was introduced to self-adaptively determine the number of free parameters and reduce retrieval noise. SIF retrievals were compared with TanSat SIF and OCO-2 SIF. The results showed good consistency and rationality. A sensitivity analysis was also conducted to verify the performance of this approach. To summarize, the approach would provide more possibilities for retrieving SIF from hyperspectral data.

TheKX-ray Fluorescence Spectrum of Neon

1973 ◽  
Vol 7 (4) ◽  
pp. 173-176 ◽  
Author(s):  
O Keski-Rahkonen
Keyword(s):  
Fluorescence Spectrum

Doublet structure of nonspecular x-ray scattering from multilayers

1992 ◽  
Vol 46 (4) ◽  
pp. 2481-2485 ◽  
Author(s):  
B. Lai ◽  
W. B. Yun ◽  
J. Chrzas ◽  
P. J. Viccaro
Keyword(s):  
X Ray ◽  
Doublet Structure ◽  
X Ray Scattering ◽  
Ray Scattering

Anthracene fluorescence at low temperatures. I. Purified single crystals

1972 ◽  
Vol 25 (7) ◽  
pp. 1411 ◽  
Author(s):  
LE Lyons ◽  
LJ Warren
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
Fluorescence Spectrum ◽  
Low Temperatures ◽  
Free Exciton ◽  
Deformation Bands ◽  
Exciton Emission ◽  
Polarized Emission ◽  
Impurity Bands ◽  
Phonon Structure

The low-temperature fluorescence spectrum of purified vapour-grown anthracene single crystals is presented and the free-exciton emission distinguished from a number of defect or impurity bands present even in the purest crystals. In assigning the observed bands the symmetry of the active vibrations and the origin of background fluorescence and deformation bands are discussed. The phonon structure in the region of the fluorescence origin was found to be almost completely b-polarized. Emission of electronic origin (25103 cm-1) was too weak to be observed. Polarization ratios of the principal vibronio bands at 5.6 K are given.

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