scholarly journals STUDY OF CHEMILUMINESCENCE BY MEANS OF CROSSED BEAMS: NITRIC OXIDE–HYDROGEN ATOM SYSTEM

1973 ◽  
Vol 2 (3) ◽  
pp. 317-320 ◽  
Author(s):  
Takamasa Ibaraki ◽  
Isao Kusunoki ◽  
Kumasaburo Kodera
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Atom ◽  
Crossed Beams ◽  
Atom System

STUDY OF CHEMILUMINESCENCE BY MEANS OF CROSSED BEAMS: NITRIC OXIDE-OXYGEN ATOM SYSTEM

1972 ◽  
Vol 1 (4) ◽  
pp. 309-312
Author(s):  
Takamasa Ibaraki ◽  
Isao Kusunoki ◽  
Kumasaburo Kodera
Keyword(s):  
Nitric Oxide ◽  
Oxygen Atom ◽  
Crossed Beams ◽  
Atom System

Determination of the Rates of Hydrogen Atom Reaction with NO by a Modulation Technique

1973 ◽  
Vol 51 (3) ◽  
pp. 370-372 ◽  
Author(s):  
R. Atkinson ◽  
R. J. Cvetanović
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Atom ◽  
Phase Shift ◽  
Rate Constants ◽  
Hydrogen Atoms ◽  
Arrhenius Parameters ◽  
Modulation Technique ◽  
The Absolute

A modulation technique has been used to determine from phase shift measurements the absolute values of the rate constants and the Arrhenius parameters of the reaction of hydrogen atoms with nitric oxide.

scholarly journals Excitation and charge transfer in low-energy hydrogen atom collisions with neutral iron

2018 ◽  
Vol 612 ◽  
pp. A90 ◽  
Author(s):  
P. S. Barklem
Keyword(s):  
Charge Transfer ◽  
Hydrogen Atom ◽  
Low Energy ◽  
Rate Coefficients ◽  
Zener Model ◽  
Atomic Orbitals ◽  
Excitation Processes ◽  
Ionic States ◽  
Covalent Interactions ◽  
Atom System

Data for inelastic processes due to hydrogen atom collisions with iron are needed for accurate modelling of the iron spectrum in late-type stars. Excitation and charge transfer in low-energy Fe+H collisions is studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multi-channel Landau–Zener model. An extensive calculation including 166 covalent states and 25 ionic states is presented and rate coefficients are calculated for temperatures in the range 1000–20 000 K. The largest rates are found for charge transfer processes to and from two clusters of states around 6.3 and 6.6 eV excitation, corresponding in both cases to active 4d and 5p electrons undergoing transfer. Excitation and de-excitation processes among these two sets of states are also significant.

scholarly journals Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen

2018 ◽  
Vol 610 ◽  
pp. A57 ◽  
Author(s):  
P. S. Barklem
Keyword(s):  
Charge Transfer ◽  
Hydrogen Atom ◽  
Electron Transition ◽  
Low Energy ◽  
Rate Coefficients ◽  
Zener Model ◽  
Stellar Spectra ◽  
Excitation Processes ◽  
Covalent Interactions ◽  
Atom System

Excitation and charge transfer in low-energy O+H collisions is studied; it is a problem of importance for modelling stellar spectra and obtaining accurate oxygen abundances in late-type stars including the Sun. The collisions have been studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals (LCAO) model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multichannel Landau-Zener model. The method has been extended to include configurations involving excited states of hydrogen using an estimate for the two-electron transition coupling, but this extension was found to not lead to any remarkably high rates. Rate coefficients are calculated for temperatures in the range 1000–20 000 K, and charge transfer and (de)excitation processes involving the first excited S-states, 4s.5So and 4s.3So, are found to have the highest rates.

scholarly journals Excitation and charge transfer in low-energy hydrogen atom collisions with neutral manganese and titanium

2020 ◽  
Vol 637 ◽  
pp. A28
Author(s):  
J. Grumer ◽  
P. S. Barklem
Keyword(s):  
Charge Transfer ◽  
Hydrogen Atom ◽  
Low Energy ◽  
Rate Coefficients ◽  
Zener Model ◽  
Excitation Processes ◽  
Ionic States ◽  
Covalent Interactions ◽  
Ionic Limit ◽  
Atom System

Data for inelastic processes due to hydrogen atom collisions with manganese and titanium are needed for accurate modeling of the corresponding spectra in late-type stars. In this work excitation and charge transfer in low-energy Mn+H and Ti+H collisions have been studied theoretically using a method based on an asymptotic two-electron linear combination of an atomic orbitals model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multichannel Landau-Zener model to treat the dynamics. Extensive calculations of charge transfer (mutual neutralization, ion-pair production), excitation and de-excitation processes in the two collisional systems are carried out for all transitions between covalent states dissociating to energies below the first ionic limit and the dominating ionic states. Rate coefficients are determined for temperatures in the range 1000–20 000 K in steps of 1000 K. Like for earlier studies of other atomic species, charge transfer processes are found to lead to much larger rate coefficients than excitation processes.

Sign in / Sign up

Export Citation Format

Share Document