Photodissociation of the Trichloromethyl Radical: Photofragment Imaging and Femtosecond Photoelectron Spectroscopy

2021 ◽  
Author(s):  
Christian Matthaei ◽  
Deb Pratim mukhopadhyay ◽  
Anja Röder ◽  
Lionel Poisson ◽  
Ingo Fischer
Keyword(s):  
Photoelectron Spectroscopy ◽  
Stratospheric Ozone ◽  
Catalytic Reactions ◽  
Ozone Destruction ◽  
Trichloromethyl Radical

Halogen-containing radicals play a key role in catalytic reactions leading to stratospheric ozone destruction, thus their photochemistry is of considerable interest. Here we investigate the photodissociation dynamics of the trichloromethyl...

Mass Selected ZEKE-Spectra of FeC2-Anions: A Spectroscopic Access to Intermediates in Catalytic Reactions of Hydrocarbons on Metal Surfaces

1994 ◽  
Vol 49 (12) ◽  
pp. 1256-1258 ◽  
Author(s):  
G. Drechsler ◽  
C. Bäßmann ◽  
U. Boesl ◽  
E. W. Schlag
Keyword(s):  
Mass Spectrometry ◽  
Photoelectron Spectroscopy ◽  
Metal Surfaces ◽  
Catalytic Reactions ◽  
Photoelectron Spectra ◽  
Mass Analyzer ◽  
Flight Mass Spectrometry ◽  
New Information ◽  
Zero Kinetic Energy ◽  
Conventional Laser

Abstract Zero-kinetic-energy (ZEKE) photoelectron spectra of metalcarbide anions are presented, allowing a high resolu­tion spectroscopic access to intermediates in catalytic reac­tions of hydrocarbons on metal surfaces. As a first compound, FeC2 (an intermediate of the iron/acetylene system) has been chosen. Important for successful ZEKE spectroscopy was a special anion source and the selection by time-of-flight mass spectrometry. In addition, conventional laser induced photo­ detachment photoelectron spectroscopy in combination with our anion source and mass analyzer delivered valuable new information.

scholarly journals Stratospheric Ozone Destruction by Man-Made Chlorofluoromethanes

Science ◽  
1974 ◽  
Vol 185 (4157) ◽  
pp. 1165-1167 ◽  
Author(s):  
R. J. Cicerone ◽  
R. S. Stolarski ◽  
S. Walters
Keyword(s):  
Stratospheric Ozone ◽  
Ozone Destruction

Isotopic Signature of N2O Produced by Marine Ammonia-Oxidizing Archaea

Science ◽  
2011 ◽  
Vol 333 (6047) ◽  
pp. 1282-1285 ◽  
Author(s):  
Alyson E. Santoro ◽  
Carolyn Buchwald ◽  
Matthew R. McIlvin ◽  
Karen L. Casciotti
Keyword(s):  
Ammonia Oxidation ◽  
Stratospheric Ozone ◽  
Isotopic Signature ◽  
Primary Sources ◽  
Ammonia Oxidizing Bacteria ◽  
Isotopic Signatures ◽  
Ozone Destruction ◽  
Ammonia Oxidizing Archaea ◽  
Isotope Measurements ◽  
Archaeal Ammonia Oxidation

The ocean is an important global source of nitrous oxide (N2O), a greenhouse gas that contributes to stratospheric ozone destruction. Bacterial nitrification and denitrification are thought to be the primary sources of marine N2O, but the isotopic signatures of N2O produced by these processes are not consistent with the marine contribution to the global N2O budget. Based on enrichment cultures, we report that archaeal ammonia oxidation also produces N2O. Natural-abundance stable isotope measurements indicate that the produced N2O had bulk δ15N and δ18O values higher than observed for ammonia-oxidizing bacteria but similar to the δ15N and δ18O values attributed to the oceanic N2O source to the atmosphere. Our results suggest that ammonia-oxidizing archaea may be largely responsible for the oceanic N2O source.

scholarly journals Stratospheric ozone destruction: The importance of bromine relative to chlorine

1999 ◽  
Vol 104 (D19) ◽  
pp. 23871-23880 ◽  
Author(s):  
J. S. Daniel ◽  
S. Solomon ◽  
R. W. Portmann ◽  
R. R. Garcia
Keyword(s):  
Stratospheric Ozone ◽  
Ozone Destruction

Pollution of the Stratosphere

1974 ◽  
Vol 1 (3) ◽  
pp. 163-176 ◽  
Author(s):  
Harold S. Johnston
Keyword(s):  
World Wide ◽  
Stratospheric Ozone ◽  
Direct Injection ◽  
Military Aircraft ◽  
Waste Products ◽  
Chemical Substances ◽  
Ozone Destruction ◽  
Catalytic Destruction ◽  
Industrial Operations ◽  
Life On Earth

Ozone in the stratosphere is vital to life on Earth. Yet it is chemically unstable and is susceptible to catalytic destruction from a long list of chemical substances, including NOX, HOX, CIOX, and metal oxides. In the stratosphere, these catalysts can be very active in ozone destruction, even when present at only one part of catalyst per 10,000 of ozone.Pollutants can reach the stratosphere in two ways: (1) by direct injection, as from supersonic transports, military aircraft, rockets, or nuclear bombs, and (2) by indirect injection from the troposphere, which may occur for inert, water-insoluble substances that will eventually work their way up into the stratosphere.The mass of catalysts sufficient to destroy stratospheric ozone at a significant, world-wide rate is less than the mass of the annual waste products from several industrial operations. In particular, the mass of nitrogen oxides from the exhausts of 500 supersonic transports is far above the threshold for significant catalytic destruction of ozone. This could have profound effects on the working and very maintenance of the biosphere.

scholarly journals A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars

2019 ◽  
Vol 90 (10) ◽  
pp. 103102 ◽  
Author(s):  
Peter Amann ◽  
David Degerman ◽  
Ming-Tao Lee ◽  
John D. Alexander ◽  
Mikhail Shipilin ◽  
...  
Keyword(s):  
High Pressure ◽  
Photoelectron Spectroscopy ◽  
Catalytic Reactions ◽  
X Ray

X-ray photoelectron spectroscopy as a tool for in-situ study of the mechanisms of heterogeneous catalytic reactions

2005 ◽  
Vol 32 (1-2) ◽  
pp. 3-15 ◽  
Author(s):  
V. I. Bukhtiyarov ◽  
V. V. Kaichev ◽  
I. P. Prosvirin
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalytic Reactions ◽  
X Ray ◽  
Heterogeneous Catalytic ◽  
In Situ Study

scholarly journals Measurement from sun-synchronous orbit of a reaction rate controlling the diurnal NO<sub>x</sub> cycle in the stratosphere

2011 ◽  
Vol 11 (10) ◽  
pp. 4861-4872 ◽  
Author(s):  
J. C. Walker ◽  
A. Dudhia
Keyword(s):  
Reaction Rate ◽  
Stratospheric Ozone ◽  
Reaction Rates ◽  
Natural Cycle ◽  
Laboratory Measurements ◽  
Ozone Destruction ◽  
Error Bars ◽  
Synchronous Orbit ◽  
First Time ◽  
Good Agreement

Abstract. A reaction rate associated with the nighttime formation of an important diurnally varying species, N2O5, is determined from MIPAS-ENVISAT. During the day, photolysis of N2O5 in the stratosphere contributes to nitrogen-catalysed ozone destruction. However, at night concentrations of N2O5 increase, temporarily sequestering reactive NOx NO and NO2 in a natural cycle which regulates the majority of stratospheric ozone. In this paper, the reaction rate controlling the formation of N2O5 is determined from this instrument for the first time. The observed reaction rate is compared to the currently accepted rate determined from laboratory measurements. Good agreement is obtained between the observed and accepted experimental reaction rates within the error bars.

ChemInform Abstract: Aluminum(III) Fluoride Originating from Decomposition of Hydrazinium Fluoroaluminate(III) under Oxidative Conditions: Syntheses, X-Ray Photoelectron Spectroscopy and Some Catalytic Reactions.

ChemInform ◽  
2011 ◽  
Vol 42 (47) ◽  
pp. no-no
Author(s):  
Tomaz Skapin ◽  
Zoran Mazej ◽  
Anna Makarowicz ◽  
Adolf Jesih ◽  
Mahmood Nickkho-Amiry ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalytic Reactions ◽  
X Ray
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