scholarly journals Bimolecular reaction dynamics from photoelectron spectroscopy of negative ions

1992 ◽  
Author(s):  
S.E. Bradforth
Keyword(s):  
Photoelectron Spectroscopy ◽  
Negative Ions ◽  
Reaction Dynamics ◽  
Bimolecular Reaction

Bimolecular reaction dynamics of Co+(3F4) + acetone reaction in real time

1999 ◽  
Vol 185-187 ◽  
pp. 837-846 ◽  
Author(s):  
Sung Soo Yi ◽  
Emily L. Reichert ◽  
James C. Weisshaar
Keyword(s):  
Real Time ◽  
Reaction Dynamics ◽  
Bimolecular Reaction

POSSIBLE "HOT" MOLECULE DESORPTION BY ELECTRON STIMULATED DECOMPOSITION OF DIHALOETHANES ON Cu(111)

1994 ◽  
Vol 01 (04) ◽  
pp. 535-538 ◽  
Author(s):  
S. TURTON ◽  
M. KADODWALA ◽  
ROBERT G. JONES
Keyword(s):  
Electron Capture ◽  
Photoelectron Spectroscopy ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Negative Ions ◽  
Low Energy ◽  
First Order ◽  
Sufficient Energy ◽  
Low Energy Electrons ◽  
Low Energy Electron

The desorption of ethene from physisorbed 1, 2-dichloroethane (DCE) and 1-bromo-2-chloroethane (BCE) on Cu(111) has been observed on irradiating the surface with electrons. The techniques used were low energy electron diffraction (LEED), Auger electron spectroscopy (AES), ultraviolet photoelectron spectroscopy (UPS), and mass spectrometric detection of the desorbed species. At 110 K physisorbed DCE and BCE underwent electron capture from low energy (<1 eV ) electrons in the secondary electron yield of the surface followed by decomposition and desorption of ethene alone. The decomposition was found to be first order in the surface coverage of the physisorbed DCE/BCE. No other molecular species desorbed from the surface, a stoichiometric amount of chemisorbed halogen was deposited and no carbon was detectable at the end of the desorption. The formation of the negative ions of these molecules by electron capture of low energy electrons in the secondary electron emission from the surface and the possible dynamics by which the negative ions undergo decomposition leaving the ethene product with sufficient energy to desorb, are discussed.

scholarly journals The Role of Structural Flexibility in Plasmon-Driven Coupling Reactions: Kinetic Limitations in the Dimerization of Nitro-Benzenes

2021 ◽  
Author(s):  
Wouter Koopman ◽  
Evgenii Titov ◽  
Radwan Mohamed Sarhan ◽  
Tina Gaebel ◽  
Robin Schürmann ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Bond Activation ◽  
Density Functional Theory Calculations ◽  
Surface Enhanced Raman Spectroscopy ◽  
Bimolecular Reaction ◽  
Structural Flexibility ◽  
Coupling Reactions ◽  
Time Resolved

<div>The plasmon-driven dimerization of 4-nitrothiophenol (4NTP) to 4-4’-dimercaptoazobenzene (DMAB) has become a testbed for understanding bimolecular photoreactions enhanced by nanoscale metals, in particular, regarding the relevance of electron transfer and heat transfer from the metal to the molecule. By adding a methylene group between the thiol bond and the nitrophenyl, we add structural flexibility to the reactant molecule. Time-resolved surface-enhanced Raman-spectroscopy proves that this (4-nitrobenzyl)mercaptan (4NBM) molecule has a larger dimerization rate and dimerization yield than 4NTP and higher selectivity towards dimerization. X-ray photoelectron spectroscopy and density functional theory calculations show that the electron transfer would prefer activation of 4NTP over 4NBM. We conclude that the rate limiting step of this plasmonic reaction is the dimerization step, which is dramatically enhanced by the additional flexibility of the reactant. This study may serve as an example for using nanoscale metals to simultaneously provide charge carriers for bond activation and localized heat for driving bimolecular reaction steps. The molecular structure of reactants can be tuned to control the reaction kinetics.<br></div>

scholarly journals Laboratory Studies of Ion Chemistry in the Interstellar Medium

2013 ◽  
Vol 9 (S297) ◽  
pp. 258-264 ◽  
Author(s):  
V. M. Bierbaum
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ion Trap ◽  
Experimental Studies ◽  
Negative Ions ◽  
Carbon Chain ◽  
Ion Chemistry ◽  
Ion Flow ◽  
Polycyclic Aromatic ◽  
Selected Ion Flow Tube ◽  
Gas Phase Ion

AbstractStudies of gas phase ion-neutral reactions provide insight into many areas of astrochemistry, including the elusive characterization of the Diffuse Interstellar Bands (DIBs). This presentation gives an overview of our experimental studies of several classes of positive and negative ions, using the flowing afterglow-selected ion flow tube and a newly modified ion trap. Earlier studies of carbon chain anions and polycyclic aromatic hydrocarbon (PAH) cations, both of which have been suggested as carriers of the DIBs, are described. More recent work including isomeric PAHs, nitrogen-containing PAHs, negative ions of PAHs, and negative ions of 5-membered heterocyclic rings are discussed. Finally, the study of quantitative thermochemistry by coupling our results with data from Photoelectron Spectroscopy is described.

ChemInform Abstract: PHOTOELECTRON SPECTROSCOPY OF ALKOXIDE AND ENOLATE NEGATIVE IONS

1983 ◽  
Vol 14 (10) ◽  
Author(s):  
G. B. ELLISON ◽  
P. C. ENGELKING ◽  
W. C. LINEBERGER
Keyword(s):  
Photoelectron Spectroscopy ◽  
Negative Ions
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