Purity and Uv Absorption Cross Sections of TMA, TMG, and TMAs

1989 ◽  
Vol 145 ◽  
Author(s):  
Hideo Okabe ◽  
M.K. Emadi-Babaki
Keyword(s):  
Absorption Spectrum ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Vapor Pressures ◽  
Uv Absorption Spectrum

AbstractVapor pressures of commercial electronic grade TMA,.TMG and TMAs samples have been measured at various temperatures and compared with those of known pure samples. Only TMA showed the presence of impurities. The UV absorption spectrum of impure TMA shows toluene to be an impurity. The UV absorption cross sections of TMA, TMG and TMAs have been measured and tabulated at several wavelengths.

UV absorption spectrum and absorption cross sections of COF2at 296 K in the range 200 - 230 nm

1992 ◽  
Vol 19 (3) ◽  
pp. 281-284 ◽  
Author(s):  
Andreas Nölle ◽  
Horst Heydtmann ◽  
Richard Meller ◽  
Wolfgang Schneider ◽  
Geert K. Moortgat
Keyword(s):  
Absorption Spectrum ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Uv Absorption Spectrum

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.

UV absorption cross sections of nitrous acid

2000 ◽  
Vol 34 (1) ◽  
pp. 13-19 ◽  
Author(s):  
A.S. Brust ◽  
K.H. Becker ◽  
J. Kleffmann ◽  
P. Wiesen
Keyword(s):  
Cross Sections ◽  
Nitrous Acid ◽  
Uv Absorption ◽  
Absorption Cross

Atmospheric Photolysis of Methyl Ethyl, Diethyl, and Propyl Ethyl Ketones: Temperature‐Dependent UV Absorption Cross Sections

2019 ◽  
Author(s):  
Jared F. Brewer ◽  
Dimitrios K. Papanastasiou ◽  
James B. Burkholder ◽  
Emily V. Fischer ◽  
Yangang Ren ◽  
...  
Keyword(s):  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Methyl Ethyl ◽  
Temperature Dependent
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