scholarly journals Multiconfigurational Quantum Chemistry Determinations of Absorption Cross Sections (σ) in the Gas Phase and Molar Extinction Coefficients (ε) in Aqueous Solution and Air–Water Interface

2021 ◽  
Author(s):  
Ana Borrego-Sánchez ◽  
Madjid Zemmouche ◽  
Javier Carmona-García ◽  
Antonio Francés-Monerris ◽  
Pep Mulet ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Chemistry ◽  
Gas Phase ◽  
Cross Sections ◽  
Water Interface ◽  
Absorption Cross ◽  
Extinction Coefficients ◽  
Air Water Interface ◽  
Molar Extinction Coefficients

Control of Long-Lived Gas Emissions From Semiconductor Processing Equipment

1994 ◽  
Vol 344 ◽  
Author(s):  
Michael T. Mocella
Keyword(s):  
Thin Film ◽  
Global Warming ◽  
Gas Phase ◽  
Cross Sections ◽  
Semiconductor Industry ◽  
Absorption Cross ◽  
Semiconductor Processing ◽  
Gas Emissions ◽  
Industrial Policies ◽  
Global Warming Potentials

AbstractCertain perfluorocompounds (PFCs) - including CF4, C2F6, SF6, and NF3 - are widely used in gas phase thin film processing applications such as dry etching and CVD chamber cleaning. Through a combination of long atmospheric lifetimes and high infrared absorption cross sections, many PFCs have high global warming potentials (GWPs). Abatement of PFC emissions from semiconductor applications is consistent with existing and developing international, national, and industrial policies for the control of greenhouse gas emissions. For PFC applications in the semiconductor industry, there exist a number of promising options for emissions control. These options include destruction (comprising combustion, plasma, and chemical-thermal routes), recovery, and process replacement.

Observation of a Liquid−Gas Phase Transition in Monolayers of Alkyltrimethylammonium Alkyl Sulfates Adsorbed at the Air/Water Interface

2005 ◽  
Vol 109 (2) ◽  
pp. 872-878 ◽  
Author(s):  
Imre Varga ◽  
Tamás Keszthelyi ◽  
Róbert Mészáros ◽  
Orsolya Hakkel ◽  
Tibor Gilányi
Keyword(s):  
Phase Transition ◽  
Gas Phase ◽  
Water Interface ◽  
Air Water Interface ◽  
Alkyl Sulfates

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

Real-Time Monitoring of the Kinetics and Gas-Phase Products of the Reaction of Ozone with an Unsaturated Phospholipid at the Air−Water Interface

Langmuir ◽  
2000 ◽  
Vol 16 (24) ◽  
pp. 9321-9330 ◽  
Author(s):  
Y. Wadia ◽  
D. J. Tobias ◽  
R. Stafford ◽  
B. J. Finlayson-Pitts
Keyword(s):  
Real Time ◽  
Gas Phase ◽  
Water Interface ◽  
Real Time Monitoring ◽  
Air Water Interface

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

scholarly journals Accurate laser measurements of ozone absorption cross-sections in the Hartley band

2014 ◽  
Vol 7 (8) ◽  
pp. 8067-8100 ◽  
Author(s):  
J. Viallon ◽  
S. Lee ◽  
P. Moussay ◽  
K. Tworek ◽  
M. Petersen ◽  
...  
Keyword(s):  
Gas Phase ◽  
Cross Section ◽  
Cross Sections ◽  
Radiative Forcing ◽  
Nitrogen Monoxide ◽  
Air Pollutant ◽  
Tropospheric Chemistry ◽  
Absorption Cross ◽  
Ozone Absorption ◽  
Hartley Band

Abstract. Ozone plays a crucial role in tropospheric chemistry, is the third largest contributor to greenhouse radiative forcing after carbon dioxide and methane and also a toxic air pollutant affecting human health and agriculture. Long-term measurements of tropospheric ozone have been performed globally for more than 30 years with UV photometers, all relying on the absorption of ozone at the 253.65 nm line of mercury. We have re-determined this cross-section and report a value of 11.27 × 10−18 cm2 molecule−1 with an expanded relative uncertainty of 0.84 %. This is lower than the conventional value currently in use and measured by Hearn in 1961 with a relative difference of 1.8%, with the consequence that historically reported ozone concentrations should be increased by 1.8%. In order to perform the new measurements of cross sections with reduced uncertainties, a system to generate pure ozone in the gas phase together with an optical system based on a UV laser with lines in the Hartley band, including accurate path length measurement of the absorption cell and a careful evaluation of possible impurities in the ozone sample by mass spectrometry and Fourier Transform Infrared spectroscopy was setup. This resulted in new measurements of absolute values of ozone absorption cross sections of 9.48 × 10−18, 10.44 × 10−18, and 11.07 × 10−18 cm2 molecule−1, with relative expanded uncertainties better than 0.6%, for the wavelengths (in vacuum) of 244.062, 248.32, and 257.34 nm respectively. The cross-section at the 253.65 nm line of mercury was determined by comparisons using a Standard Reference Photometer equipped with a mercury lamp as the light source. The newly reported value should be used in the future to obtain the most accurate measurements of ozone concentration, which are in closer agreement with non UV photometry based methods such as the gas phase titration of ozone with nitrogen monoxide.

Gas-phase absorption cross sections of 24 monocyclic aromatic hydrocarbons in the UV and IR spectral ranges

1999 ◽  
Vol 33 (4) ◽  
pp. 525-540 ◽  
Author(s):  
Thomas Etzkorn ◽  
Björn Klotz ◽  
Søren Sørensen ◽  
Iulia V. Patroescu ◽  
Ian Barnes ◽  
...  
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Aromatic Hydrocarbons ◽  
Absorption Cross ◽  
Monocyclic Aromatic Hydrocarbons ◽  
Spectral Ranges
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