Reactive Intermediates in the Gas Phase, Generation and Monitoring. Edited by D. W. Setser. Academic, New York, 1979.

1981 ◽  
Vol 20 (6) ◽  
pp. 1333-1334
Author(s):  
Hans Siegbah
Keyword(s):  
New York ◽  
Gas Phase ◽  
Reactive Intermediates

Ultrasensitive spectroscopy of ionic reactive intermediates in the gas phase performed with the first coupling of an IR FEL with an FTICR-MS

2003 ◽  
pp. 541-546
Author(s):  
Philippe Maître ◽  
Sophie Le Caër ◽  
Aude Simon ◽  
William Jones ◽  
Joël Lemaire ◽  
...  
Keyword(s):  
Gas Phase ◽  
Reactive Intermediates ◽  
Fticr Ms

Modeling the Effect of Chlorine Emissions on Ozone Levels over the Eastern United States

2007 ◽  
Vol 46 (7) ◽  
pp. 1009-1019 ◽  
Author(s):  
Golam Sarwar ◽  
Prakash V. Bhave
Keyword(s):  
New York ◽  
New Jersey ◽  
Gas Phase ◽  
Sea Salt ◽  
Daily Maximum ◽  
Eastern United States ◽  
Sea Salt Aerosols ◽  
Ozone Concentrations ◽  
Houston Area ◽  
Effect Of Chlorine

Abstract This paper presents model estimates of the effect of chlorine emissions on atmospheric ozone concentrations in the eastern United States. The model included anthropogenic molecular chlorine emissions, anthropogenic hypochlorous acid emissions from cooling towers and swimming pools, and chlorine released from sea-salt aerosols. The release of chlorine emissions from sea-salt aerosols was modeled using heterogeneous reactions involving chloride ions in aerosols and three gas-phase species. The gas-phase chlorine chemistry was combined with the Carbon Bond Mechanism and incorporated into the Community Multiscale Air Quality modeling system. Air quality model simulations were performed for July 2001 and the results obtained with and without chlorine emissions were analyzed. When chlorine emissions were included in the model, ozone concentrations increased in the Houston, Texas, and New York–New Jersey areas. The daily maximum 1-h ozone concentrations increased by up to 12 parts per billion by volume (ppbv) in the Houston area and 6 ppbv in the New York–New Jersey area. The daily maximum 8-h ozone concentrations increased by up to 8 ppbv in the Houston area and 4 ppbv in the New York–New Jersey area. The monthly average daily maximum 1-h ozone concentration increased by up to 3 ppbv in the Houston area, but the increases in the monthly average daily maximum 1-h ozone concentration in the New York–New Jersey area were small. Chlorine emissions and chemistry enhanced the volatile organic compound oxidation rates and, thereby, increased the ozone production rate.

scholarly journals Photoelectron spectroscopy of reactive intermediates

1988 ◽  
Vol 324 (1578) ◽  
pp. 197-207 ◽  
Keyword(s):  
Transition Metal ◽  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Photoelectron Spectrum ◽  
Reactive Intermediates ◽  
Vapour Phase ◽  
Photoelectron Spectra ◽  
Triatomic Molecule ◽  
Recent Developments ◽  
Vanadium Monoxide

Recent developments in the use of photoelectron spectroscopy to study reactive intermediates in the gas phase are reviewed. The information to be derived on low-lying cationic states from such studies is illustrated by considering two diatomic molecules, NCI and PF, and one triatomic molecule, HNO. Also, the use of a transition-metal photoelectron spectrum to interpret the photoelectron spectrum of the corresponding transition-metal oxide is discussed by using the spectra of vanadium and vanadium monoxide as examples. The value of super-heating in high-temperature photoelectron spectroscopy is demonstrated by considering the vapour-phase photoelectron spectra of the monomers and dimers of sodium hydroxide.

scholarly journals Measuring atmospheric naphthalene with laser-induced fluorescence

2004 ◽  
Vol 4 (2) ◽  
pp. 563-569 ◽  
Author(s):  
M. Martinez ◽  
H. Harder ◽  
X. Ren ◽  
R. L. Lesher ◽  
W. H. Brune
Keyword(s):  
New York ◽  
New York City ◽  
Gas Phase ◽  
Laser Induced Fluorescence ◽  
Integration Time ◽  
Mixing Ratio ◽  
Quenching Rate ◽  
Anthropogenic Pollutants ◽  
Mixing Ratios ◽  
Instrument Configuration

Abstract. A new method for measuring gas-phase naphthalene in the atmosphere is based on laser-induced fluorescence at low pressure. The fluorescence spectrum of naphthalene near 308 nm was identified. Naphthalene fluorescence quenching by N, O and HO was investigated in the laboratory. No significant quenching was found for HO with mixing ratio up to 2.5%. The quenching rate of naphthalene fluorescence is (1.980.18) 10cmmolecules for N, and (2.480.08)10cmmolecules for O at 297 K. Instrument calibrations were performed with a range of naphthalene mixing ratios between 5 and 80 parts per billion by volume (ppbv, 10. In the current instrument configuration, the detection limit is estimated to be about 20 parts per trillion by volume (pptv, 10 with 2 confidence and a 1-min integration time. Measurements of atmospheric naphthalene in three cities, Nashville, TN, Houston, TX, and New York City, NY, are presented. Good correlation between naphthalene and major anthropogenic pollutants is found.

Hydrolytische Bildung von Perchlorsiloxanen / Formation of Chlorosiloxanes by Hydrolysis

1999 ◽  
Vol 54 (5) ◽  
pp. 577-582 ◽  
Author(s):  
Heike Quellhorst ◽  
Andreas Wilkening ◽  
Nicola Söger ◽  
Michael Binnewies
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Reactive Intermediates ◽  
Reaction Products ◽  
Condensation Reactions ◽  
Intramolecular Condensation ◽  
Hydrolysis Reactions

During the reaction of Si2OCl6 with H2O in the gas phase the intermediate Si2OCl5OH has been observed by mass-spectrometry. Reactive intermediates like this are responsible for the formation of higher chlorosilanes by slow hydrolysis reactions of chlorosilanes and -siloxanes. Reaction products of inter- and intramolecular condensation reactions have been observed by GC-MS-methods.

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