scholarly journals Temperature dependent emission and absorption cross section of Yb^3+ doped yttrium lanthanum oxide (YLO) ceramic and its application in diode pumped amplifier

2013 ◽  
Vol 21 (S4) ◽  
pp. A726 ◽  
Author(s):  
Saumyabrata Banerjee ◽  
Joerg Koerner ◽  
Mathias Siebold ◽  
Qiuhong Yang ◽  
Klaus Ertel ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Lanthanum Oxide ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Diode Pumped

scholarly journals The H Lyman-<font face="Symbol"><b>a</b></font> actinic flux in the middle atmosphere

2003 ◽  
Vol 3 (1) ◽  
pp. 225-231 ◽  
Author(s):  
T. Reddmann ◽  
R. Uhl
Keyword(s):  
Quantum Yield ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Middle Atmosphere ◽  
Lower Thermosphere ◽  
Resonance Scattering ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Actinic Flux ◽  
Dependent Absorption

Abstract. The penetration of solar H Lyman-a radiation into the terrestrial middle atmosphere is studied in detail. The Lyman-a actinic flux is calculated with a Monte Carlo approach including multiple resonance scattering of Lyman-a photons within the terrestrial atmosphere and a temperature dependent absorption cross section of molecular oxygen. The dependence of the actinic flux on the temperature profile is significant for O2 column densities greater than about 1024 m-2. For column densities greater than about 5 · 1024 m-2 resonance scattering becomes important at solar zenith angles > 60°. The O(1D) quantum yield of the O2 dissociation by Lyman-a photons is found to decrease from 0.58 in the lower thermosphere to 0.48 in the lower mesosphere. Parameterisations for Lyman-a actinic flux, mean O2 absorption cross section and O(1D) quantum yield including temperature dependence and resonance scattering are given valid up to a O2 column density of about 1025 m-2.

Effect of Dimers on the Temperature-Dependent Absorption Cross Section of Methyl Iodide

1996 ◽  
Vol 100 (28) ◽  
pp. 11559-11565 ◽  
Author(s):  
Gabriela C. G. Waschewsky ◽  
Robert Horansky ◽  
Veronica Vaida
Keyword(s):  
Cross Section ◽  
Methyl Iodide ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Dependent Absorption

scholarly journals The H Lyman-α actinic flux in the middle atmosphere

2002 ◽  
Vol 2 (5) ◽  
pp. 1635-1654
Author(s):  
Th. Reddmann ◽  
R. Uhl
Keyword(s):  
Quantum Yield ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Middle Atmosphere ◽  
Lower Thermosphere ◽  
Resonance Scattering ◽  
Absorption Cross ◽  
Temperature Dependent ◽  
Actinic Flux ◽  
Dependent Absorption

Abstract. The penetration of solar H Lyman-a radiation into the terrestrial middle atmosphere is studied in detail. The Lyman-a actinic flux is calculated with a Monte Carlo approach including multiple resonance scattering of Lyman-a photons within the terrestrial atmosphere and a temperature dependent absorption cross section of molecular oxygen. The dependence of the actinic flux on the temperature profile is significant for O2 column densities greater than about 1024 m-2. For column densities greater than about 5 · 1024 m-2 resonance scattering becomes important at solar zenith angles > 60°. The \\OD\\ quantum yield of the O2 dissociation by Lyman-aphotons is found to decrease from 0.58 in the lower thermosphere to 0.48 in the lower mesosphere. Parameterisations for Lyman-a actinic flux, mean O2 absorption cross section and \\OD\\quantum yield including temperature dependence and resonance scattering are given valid up to a O2 column density of about 1025 m-2.

scholarly journals Revised temperature-dependent ozone absorption cross-section spectra (Bogumil et al.) measured with the SCIAMACHY satellite spectrometer

2013 ◽  
Vol 6 (11) ◽  
pp. 3055-3065 ◽  
Author(s):  
W. Chehade ◽  
V. Gorshelev ◽  
A. Serdyuchenko ◽  
J. P. Burrows ◽  
M. Weber
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Total Ozone ◽  
Published Data ◽  
Absorption Cross ◽  
Cross Section Data ◽  
Temperature Dependent ◽  
Ozone Absorption ◽  
Section Data

Abstract. Absorption cross-section spectra for ozone and other trace gases had been measured using the Scanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) satellite instrument at relevant atmospheric conditions. The measured cross sections were relative cross sections and were converted to absolute values using published data. Using SCIAMACHY's FM cross sections as published by Bogumil et al. (2003) in the SCIAMACHY retrievals of total ozone leads to an overestimation in the total ozone by 5% compared to collocated GOME data. This work presents the procedures followed to correct the ozone cross-section data starting from original raw data (optical density spectra). The quality of the revised temperature-dependent ozone absorption cross sections is investigated over SCIAMACHY's entire spectral range. The revised data agree well within 3% with other published ozone cross sections and preserve the correct temperature dependence in the Hartley, Huggins, Chappuis and Wulf bands as displayed by the literature data. SCIAMACHY's total ozone columns retrieved using the revised cross-section data are shown to be within 1% compared to the ozone amounts retrieved routinely from SCIAMACHY, which uses Bogumil et al. (2003) data but adjusted with a scaling factor of 5.3% and a wavelength shift of 0.08 nm.

scholarly journals Photoelectric absorption cross section of silicon near the bandgap from room temperature to sub-Kelvin temperature

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025120
Author(s):  
C. Stanford ◽  
M. J. Wilson ◽  
B. Cabrera ◽  
M. Diamond ◽  
N. A. Kurinsky ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Room Temperature ◽  
Absorption Cross ◽  
Photoelectric Absorption

scholarly journals Ultraviolet Absorption Cross-Sections of Ammonia at Elevated Temperatures for Nonintrusive Quantitative Detection in Combustion Environments

2021 ◽  
pp. 000370282199044
Author(s):  
Wubin Weng ◽  
Shen Li ◽  
Marcus Aldén ◽  
Zhongshan Li
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Elevated Temperatures ◽  
Uv Absorption ◽  
Energy Utilization ◽  
Quantitative Detection ◽  
Absorption Cross ◽  
Hot Gas

Ammonia (NH3) is regarded as an important nitrogen oxides (NOx) precursor and also as an effective reductant for NOx removal in energy utilization through combustion, and it has recently become an attractive non-carbon alternative fuel. To have a better understanding of thermochemical properties of NH3, accurate in situ detection of NH3 in high temperature environments is desirable. Ultraviolet (UV) absorption spectroscopy is a feasible technique. To achieve quantitative measurements, spectrally resolved UV absorption cross-sections of NH3 in hot gas environments at different temperatures from 295 K to 590 K were experimentally measured for the first time. Based on the experimental results, vibrational constants of NH3 were determined and used for the calculation of the absorption cross-section of NH3 at high temperatures above 590 K using the PGOPHER software. The investigated UV spectra covered the range of wavelengths from 190 nm to 230 nm, where spectral structures of the [Formula: see text] transition of NH3 in the umbrella bending mode, v2, were recognized. The absorption cross-section was found to decrease at higher temperatures. For example, the absorption cross-section peak of the (6, 0) vibrational band of NH3 decreases from ∼2 × 10−17 to ∼0.5 × 10−17 cm2/molecule with the increase of temperature from 295 K to 1570 K. Using the obtained absorption cross-section, in situ nonintrusive quantification of NH3 in different hot gas environments was achieved with a detection limit varying from below 10 parts per million (ppm) to around 200 ppm as temperature increased from 295 K to 1570 K. The quantitative measurement was applied to an experimental investigation of NH3 combustion process. The concentrations of NH3 and nitric oxide (NO) in the post flame zone of NH3–methane (CH4)–air premixed flames at different equivalence ratios were measured.

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