Emission spectrum of CuSe molecule in the visible region

1962 ◽  
Vol 8 (1-6) ◽  
pp. 79-85 ◽  
Author(s):  
K.C. Joshi
Keyword(s):  
Emission Spectrum ◽  
Visible Region

THE EMISSION SPECTRUM OF THE PbBr MOLECULE

1967 ◽  
Vol 45 (11) ◽  
pp. 3663-3666 ◽  
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Emission Spectrum ◽  
Visible Region ◽  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The emission spectrum of the A–X system of the PbBr molecule in the region 4 600–5 900 Å has been obtained in the second order of a 21-ft concave grating spectrograph (15 000 lines per inch) with a dispersion of 1.25 Å/mm. A rotational analysis of four bands—(3, 2), (2, 2), (3, 1), and (4, 1)—of this system has been done, leading to the determination of the following rotational constants:[Formula: see text]The system appears to be similar to the A-X system of the PbCl molecule in the visible region, and a [Formula: see text] transition has been suggested.

Spectral shifts upon halide segregation in perovskite nanocrystals observed via transient absorption spectroscopy

MRS Advances ◽  
2020 ◽  
Vol 5 (51) ◽  
pp. 2613-2621
Author(s):  
Michael L. Crawford ◽  
James C. Sadighian ◽  
Yasser Hassan ◽  
Henry J. Snaith ◽  
Cathy Y. Wong
Keyword(s):  
Emission Spectrum ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Visible Region ◽  
Volume Ratio ◽  
Transient Absorption Spectroscopy ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Before And After ◽  
Halide Perovskite

AbstractLead halide perovskite nanocrystals (NCs) are promising for applications in light emitting devices owing to a strong emission spectrum that is tunable throughout the visible region by altering halide composition. However, in mixed-halide perovskite systems photoinduced migration drives formation of halide-segregated domains, altering the emission spectrum. The mechanism by which this segregation occurs is currently the subject of intense investigation. Processes involving the perovskite surface are expected to be of enhanced prevalence in NCs due to their large surface area to volume ratio. In this work, we use transient absorption spectroscopy to probe the excited-state dynamics of NCs before and after halide segregation. Comparison of global fit spectra of the measured signals suggests the accumulation of iodide at the surface, resulting in a redshifted emission spectrum.

scholarly journals Estimation of Fluor Emission Spectrum through Digital Photo Image Analysis with a Water-Based Liquid Scintillator

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8483
Author(s):  
Ji-Won Choi ◽  
Ji-Young Choi ◽  
Kyung-Kwang Joo
Keyword(s):  
Image Analysis ◽  
Emission Spectrum ◽  
Liquid Scintillator ◽  
Color Space ◽  
Visible Region ◽  
Digital Camera ◽  
Imaging Analysis ◽  
Digital Photo ◽  
Water Based ◽  
Photo Image

In this paper, we performed a feasibility study of using a water-based liquid scintillator (WbLS) for conducting imaging analysis with a digital camera. The liquid scintillator (LS) dissolves a scintillating fluor in an organic base solvent to emit light. We synthesized a liquid scintillator using water as a solvent. In a WbLS, a suitable surfactant is needed to mix water and oil together. As an application of the WbLS, we introduced a digital photo image analysis in color space. A demosaicing process to reconstruct and decode color is briefly described. We were able to estimate the emission spectrum of the fluor dissolved in the WbLS by analyzing the pixel information stored in the digital image. This technique provides the potential to estimate fluor components in the visible region without using an expensive spectrophotometer. In addition, sinogram analysis was performed with Radon transformation to reconstruct transverse images with longitudinal photo images of the WbLS sample.

Control of the Output from a High-Intensity Xenon Arc Lamp

1976 ◽  
Vol 46 (5) ◽  
pp. 342-346
Author(s):  
J. D. Cooney ◽  
D. M. Wiles
Keyword(s):  
High Pressure ◽  
Emission Spectrum ◽  
High Intensity ◽  
Laboratory Testing ◽  
Visible Region ◽  
Testing Equipment ◽  
Xenon Lamp ◽  
Reasonable Approximation ◽  
Methods Of Operation ◽  
Main Factor

The emission spectrum of a xenon high-pressure arc lamp provides a reasonable approximation to the ultraviolet-visible region of terrestrial sunlight. This lamp has therefore been employed in a variety of laboratory testing equipment designed to predict the useful outdoor lifetime of plastics, textiles, dyes, asphalt, etc. Several methods of operation (ASTM and Atlas) of an Atlas 6000W xenon arc Weather-Ometer have been examined, and the necessity of monitoring intensities at both ultraviolet (at 340 nm) and visible (at 420 nm) wavelengths is illustrated. Lamp aging has been found to be the main factor in decreasing lamp intensity. Xenon lamp control at intensities similar to noon summer sunlight at 340 nm gives short lamp lifetimes of approximately 400 h. Operation of the arc at lower wattages (3500–5000W) has been found to provide a stable lamp intensity for much longer periods—approximately 2000 h.

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

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