Atmospheric Fate of Carbonyl Oxidation Products Originating from α-Pinene and Δ3-Carene:  Determination of Rate of Reaction with OH and NO3Radicals, UV Absorption Cross Sections, and Vapor Pressures

1997 ◽  
Vol 31 (11) ◽  
pp. 3166-3172 ◽  
Author(s):  
Mattias Hallquist ◽  
Ingvar WÄngberg ◽  
Evert LjungstrÖm
Keyword(s):  
Cross Sections ◽  
Uv Absorption ◽  
Oxidation Products ◽  
Absorption Cross ◽  
Vapor Pressures ◽  
Atmospheric Fate ◽  
Rate Of Reaction

Experimental Determination of SO2, C2H2, and O2 UV Absorption Cross Sections at Elevated Temperatures and Pressures

1997 ◽  
Vol 51 (9) ◽  
pp. 1311-1315 ◽  
Author(s):  
J. Vattulainen ◽  
L. Wallenius ◽  
J. Stenberg ◽  
R. Hernberg ◽  
V. Linna
Keyword(s):  
Absorption Spectra ◽  
Wavelength Range ◽  
Cross Sections ◽  
Elevated Temperatures ◽  
Uv Absorption ◽  
Reference Spectrum ◽  
Absorption Cross ◽  
Deuterium Lamp ◽  
Made In

A heated and pressurized quartz cell with 150.5-mm pathlength was used to experimentally determine UV absorption spectra and further absorption cross sections of SO2, C2H2, and O2 in the wavelength range between 200 and 400 nm. Spectra were recorded at room temperature, and at 600 and 800 °C and at absolute pressures between 1 and 6 bar. A 30-W deuterium lamp was used as a light source, and the light was detected with a photomultiplier tube through a 0.4-m Czerny–Turner monochromator. Slit widths of the monochromator were adjusted to achieve a 5 Å measurement bandwidth, and the scan through the wavelength range was made in 5 Å steps. For each individual temperature and pressure level, a reference spectrum was first recorded with the cell filled with nitrogen. After this, the cell was filled with the selected species mixed with nitrogen, and the absorption spectra were recorded in similar conditions. The studied gas mixtures were calibrated to 3% accuracy.

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

ChemInform Abstract: Atmospheric Fate of CF2H2, CH3CF3, CHF2CF3, and CH3CFCl2: Rate Coefficients for Reactions with OH and UV Absorption Cross Sections of CH3CFCl2.

ChemInform ◽  
2010 ◽  
Vol 22 (42) ◽  
pp. no-no
Author(s):  
R. TALUKDAR ◽  
A. MELLOUKI ◽  
T. GIERCZAK ◽  
J. B. BURKHOLDER ◽  
S. A. MCKEEN ◽  
...  
Keyword(s):  
Cross Sections ◽  
Uv Absorption ◽  
Rate Coefficients ◽  
Absorption Cross ◽  
Atmospheric Fate

Atmospheric fate of several hydrofluoroethanes and hydrochloroethanes: 2. UV absorption cross sections and atmospheric lifetimes

1991 ◽  
Vol 96 (D3) ◽  
pp. 5013 ◽  
Author(s):  
John J. Orlando ◽  
James B. Burkholder ◽  
Stuart A. McKeen ◽  
A. R. Ravishankara
Keyword(s):  
Cross Sections ◽  
Uv Absorption ◽  
Absorption Cross ◽  
Atmospheric Fate

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.

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

scholarly journals Determination of the absorption cross-sections of higher order iodine oxides at 355 nm and 532 nm

2020 ◽  
Author(s):  
Thomas R. Lewis ◽  
Juan Carlos Gómez Martin ◽  
Mark A. Blitz ◽  
Carlos A. Cuevas ◽  
John M. C. Plane ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Atmospheric Chemistry ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Time Resolved ◽  
Flight Mass Spectrometry ◽  
Iodine Oxides ◽  
Photo Ionization

Abstract. Iodine oxides (IxOy) play an important role in the atmospheric chemistry of iodine. They are initiators of new particle formation events in the coastal and polar boundary layer and act as iodine reservoirs in tropospheric ozone-depleting chemical cycles. Despite the importance of the aforementioned processes, the photochemistry of these molecules has not been studied in detail previously. Here, we report the first determination of the absorption cross sections of IxOy, x = 2, 3, 5, y = 1–12 at λ = 355 nm by combining pulsed laser photolysis of I2/O3 gas mixtures in air with time-resolved photo-ionization time-of-flight mass spectrometry, using NO2 actinometry for signal calibration. The oxides selected for absorption cross section determinations are those presenting the strongest signals in the mass spectra, where signals containing 4 iodine atoms are absent. The method is validated by measuring the absorption cross section of IO at 355 nm, σ355 nm, IO = (1.2 ± 0.1) ×  10–18 cm2, which is found to be in good agreement with the most recent literature. The results obtained are: σ355 nm, I2O3 

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