Laser Induced Fluorescence
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2021 ◽  
Vol 92 (12) ◽  
pp. 123503
Author(s):  
Di Jiang ◽  
Chi-Shung Yip ◽  
Wei Zhang ◽  
Chen-yao Jin ◽  
Guo-Sheng Xu ◽  
...  

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1345
Author(s):  
Giulia Ricci ◽  
Andrea Maurizio Monti ◽  
Renato Pagano ◽  
Marco Martini ◽  
Luisa Caneve ◽  
...  

Quartz from La Sassa (Tuscany, Italy) presents a unique luminescence related to intrinsic and extrinsic defects in the crystal lattice due to the growth mechanisms in hydrothermal conditions. The bright fluorescence under the UV lamp was apparent to collectors since the early 1970s, and it entered the literature as a reference case of yellow-luminescent quartz. Early reports present the history of the discovery, the geological context, and preliminary luminescence measurements of the quartz nodules, suggesting various activators as potentially responsible of the peculiar luminescence effects: uranyl groups (UO22+), rare earths (Tb3+, Eu3+, Dy3+, Sm3+, Ce3+) and polycyclic aromatic compounds (PAH). Here, we report a full investigation of the La Sassa material, by a multi-analytical approach encompassing cathodoluminescence optical microscopy (OM-CL), laser-induced fluorescence (LIF), wavelength resolved thermally stimulated luminescence (WR-TSL), trace elements analysis by mass spectrometry (ICP-MS) and Raman spectroscopy (RS). The results provide a significant step forward in the interpretation of the luminescence mechanisms: the main luminescent centres are identified as alkali-compensated (mainly Li+ and Na+, K+ and H+) aluminum [AlO4/M+]0 centres substituting for Si, where the recombination of a self-trapped exciton (STE) or an electron at a nonbridging oxygen hole centre (NBOHC) are active.


2021 ◽  
Vol 130 (20) ◽  
pp. 203302
Author(s):  
Elizabeth J. Kautz ◽  
Mark C. Phillips ◽  
Sivanandan S. Harilal

2021 ◽  
Vol 63 (11) ◽  
pp. 51-55
Author(s):  
Manh Huy Nguyen ◽  
◽  
Hong Anh Duong ◽  
Hung Viet Pham ◽  
◽  
...  

This work presented a capillary electrophoresis method with indirect laser-induced fluorescence detection for the simultaneous determination of phenol and four chlorophenol derivatives. The separation was obtained within 20 minutes with a background electrolyte composed of 5 mM borax and 1 mM fluorescein (pH=9.75), 17 kV of applied voltage, and 120 s of hydrostatic injection. At the optimal conditions, the limit of detections for phenolic compounds was in the range of 0.08-0.23 mg/l, and the RSD data of repeatability and reproducibility were less than 8.0% for both migration times and peak areas. This developed method was applied to analyse concentrations of phenolic compounds in surface water and wastewater samples, with the recoveries ranging from 59.4 to 102.5%.


2021 ◽  
Author(s):  
Xinqi Zhu ◽  
Pei Zhang ◽  
Baodui Wang ◽  
Panpan Sun ◽  
Guanghui Wang ◽  
...  

2021 ◽  
Author(s):  
Panagiotis Minos ◽  
Panos N. Papanicolaou

Abstract Planar, vertical buoyant jets are of particular interest, both for research and practical purposes for being related to the disposal of the effluent from wastewater treatment plants or saline, a by-product from desalination plants into a body of stagnant fluid. Analytical, closed form solution is derived for plane buoyant jets based on a buoyant jet width parameter proposed by List and Imberger (1973), and compares to earlier laboratory experiments satisfactorily. The derived entrainment coefficient as a function of the local Richardson number of the flow, takes two asymptotic values for jet-like and plume-like flows, while in fountains it takes values lower than that in jets. Laboratory experiments were performed to measure the penetration height of vertical plane fountains with initial Froude number in the range 20 to 130 using shadowgraph and Planar Laser Induced Fluorescence (PLIF) techniques. Interest was focused on the maximum and terminal, steady-state penetration height before the flow direction reversed. The flow was found to be in a state of unstable equilibrium, as it deviated from the vertical axis, swinging on either side. The equations of motion have been solved numerically using the derived entrainment coefficient function, and the results are congruent to earlier and present experiment for vertical fountains.


2021 ◽  
Vol 130 (18) ◽  
pp. 183305
Author(s):  
C. V. Young ◽  
A. Lucca Fabris ◽  
N. A. MacDonald-Tenenbaum ◽  
W. A. Hargus ◽  
M. A. Cappelli

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