Gas phase UV absorption cross-sections for a series of hydroxycarbonyls

2012 ◽  
Vol 529 ◽  
pp. 16-22 ◽  
Author(s):  
L. Messaadia ◽  
G. El Dib ◽  
A. Ferhati ◽  
E. Roth ◽  
A. Chakir
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross

Kinetics of the gas phase reaction OH + NO(+M)→HONO(+M) and the determination of the UV absorption cross sections of HONO

1997 ◽  
Vol 272 (5-6) ◽  
pp. 383-390 ◽  
Author(s):  
Palle Pagsberg ◽  
Erling Bjergbakke ◽  
Emil Ratajczak ◽  
Alfred Sillesen
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Phase Reaction ◽  
Absorption Cross ◽  
Gas Phase Reaction ◽  
Kinetics Of

Gas-phase UV absorption cross-sections and photolysis kinetics of 4-hydroxy-3-hexanone: Atmospheric implications

2017 ◽  
Vol 688 ◽  
pp. 43-46 ◽  
Author(s):  
L. Aslan ◽  
H. Laversin ◽  
E. Roth ◽  
P. Coddeville ◽  
C. Fittschen ◽  
...  
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Kinetics Of

Gas phase UV absorption cross-sections for a series of amides

2005 ◽  
Vol 404 (1-3) ◽  
pp. 74-78 ◽  
Author(s):  
A. Chakir ◽  
G. Solignac ◽  
A. Mellouki ◽  
D. Daumont
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross

Measurements of the UV absorption cross-sections for HO2 and CH3O2 in the gas phase

1987 ◽  
Vol 39 (2) ◽  
pp. 201-215 ◽  
Author(s):  
Michael J. Kurylo ◽  
Timothy J. Wallington ◽  
Philip A. Ouellette
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross

scholarly journals Spectrally Resolved Ultraviolet (UV) Absorption Cross-Sections of Alkali Hydroxides and Chlorides Measured in Hot Flue Gases

2018 ◽  
Vol 72 (9) ◽  
pp. 1388-1395 ◽  
Author(s):  
Wubin Weng ◽  
Tomas Leffler ◽  
Christian Brackmann ◽  
Marcus Aldén ◽  
Zhongshan Li
Keyword(s):  
Gas Phase ◽  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Relative Concentration ◽  
Uv Absorption ◽  
Flue Gases ◽  
Absorption Cross ◽  
Spectrally Resolved ◽  
Alkali Chlorides

Spectrally resolved ultraviolet (UV) absorption cross-sections of gas-phase sodium chloride (NaCl), potassium hydroxide (KOH), and sodium hydroxide (NaOH) were measured, for the first time, in hot flue gases at different temperatures. Homogenous gas-phase NaCl, KCl (potassium chloride), NaOH, and KOH at temperatures 1200 K, 1400 K, 1600 K, and 1850 K were prepared in the post-flame zone of laminar flames by seeding nebulized droplets out of aqueous solution of corresponding alkali species. The amount of droplets seeded into the flame was kept constant, so the relative concentration of different alkali species can be derived. The broadband UV absorption cross-section of KCl vapor reported by Leffler et al. was adopted to derive the absorption cross-section curves of NaCl, NaOH, and KOH with the corresponding measured spectrally resolved absorbance spectra. No significant changes in the spectral structures in the absorption cross-sections were found as the temperature varied between 1200 K and 1850 K, except for NaOH at around 320 nm. The difference between the absorption spectral curves of alkali chlorides and hydroxides is significant at wavelengths above 300 nm, which thus can be used to distinguish and obtain the concentrations of alkali chlorides and hydroxides in the broadband UV absorption measurements.

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

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
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