scholarly journals Calculations of rate constants for the three‐body recombination of H2 in the presence of H2

1988 ◽  
Vol 89 (4) ◽  
pp. 2076-2091 ◽  
Author(s):  
David W. Schwenke
Keyword(s):  
Rate Constants ◽  
Three Body ◽  
Body Recombination

Estimation of Three‐Body Recombination Rate Constants

1964 ◽  
Vol 40 (4) ◽  
pp. 1166-1167 ◽  
Author(s):  
Benjamin J. Woznick ◽  
James C. Keck
Keyword(s):  
Rate Constants ◽  
Recombination Rate ◽  
Three Body ◽  
Body Recombination

Homogeneous rate of recombination of hydrogen atoms

1968 ◽  
Vol 46 (6) ◽  
pp. 1005-1015 ◽  
Author(s):  
F. S. Larkin
Keyword(s):  
Rate Constants ◽  
Hydrogen Atoms ◽  
First Order ◽  
A Value ◽  
Rate Of Decay ◽  
Low Levels ◽  
Three Body ◽  
Conventional Type ◽  
Order Surface ◽  
Body Recombination

The rate of decay of hydrogen atoms has been measured in a conventional type of discharge-flow system at temperatures between 190–350 °K. The recombination fitted the equation[Formula: see text]where ks is the first order surface rate constant. No three-body recombination for M = H was observed at the low levels of dissociation (2–5%) employed. When the flow gases contained traces of water vapor and (or) oxygen as impurities, the homogeneous rate constants (k2,M) had a small positive activation energy which was due to the influence of a surface reaction between hydrogen atoms and the impurities. In the absence of impurities, true homogeneous rate constants were obtained. A value of k2,Ar = 4.6 ± 0.5 × 1015 cm6 mole−20s−1 was found at 291 °K. The temperature variation was approximately T−1/2 over the range 190–350 °K.

The association of oxygen atoms and their combination with nitrogen atoms

1967 ◽  
Vol 296 (1445) ◽  
pp. 222-232 ◽  
Keyword(s):  
Activation Energy ◽  
Temperature Coefficient ◽  
Rate Constants ◽  
Room Temperature ◽  
Kinetic Studies ◽  
Active Nitrogen ◽  
Similar Temperature ◽  
Three Body ◽  
Body Recombination ◽  
Oxygen Atoms

The rate constants of the reactions N + O + M = NO + M (2) O + O + M = O 2 + M (4) have been determined in active nitrogen systems, nitric oxide being added to result in the partial production of oxygen atoms. The concentrations of these atoms were monitored by measurements of the intensity of the N 2 First Positive emission and NO β emission. The following rate constants (in cm 6 mole –2 s –1 ) were obtained at room temperature (298 °K) N 2 Ar He 10 –15 k 2 3.88 ± 0.30 2.98 ± 0.35 1.36 ± 0.17 10 -14 k 4 11.3 ± 1.1 6.0 ± 0.6 4.6 + 0.4 In the range 196 to 327 °K, the temperature coefficient of reaction (2) corresponds to a T -½ dependence or an activation energy of –270 ± 120 cal/mole. This is unusually small for a three body recombination and contrasts with more ‘normal’ activation energy of –1420 ±350 cal/mole found for reaction (4). The NO β emission associated with reaction (2) has a similar temperature coefficient to the overall reaction, but is slightly enhanced by replacing the nitrogen carrier by argon. Our kinetic studies of this emission generally confirm the mechanism of Young & Sharpless (1962).

THREE-BODY RECOMBINATION OF GASEOUS IONS

1960 ◽  
Vol 38 (10) ◽  
pp. 1693-1701 ◽  
Author(s):  
Takayuki Fueno ◽  
Henry Eyring ◽  
Taikyue Ree
Keyword(s):  
Binding Energy ◽  
Theoretical Approach ◽  
Rate Constants ◽  
Lennard Jones Potential ◽  
Internuclear Separation ◽  
Jones Potential ◽  
Lennard Jones ◽  
Three Body ◽  
Body Recombination ◽  
Complex Ion

The recombination of gaseous ions in the presence of third bodies is assumed to follow a sequence of two bimolecular steps: M + X+ [Formula: see text] MX+ and MX+ + Y− [Formula: see text] XY + M. The termolecular rate constants of the over-all processes are calculated for several ionized gases at various temperatures. For the calculation, the equilibrium internuclear separation and the corresponding binding energy of a complex ion, MX+, are obtained by minimizing the interaction energy between M and X+, which is approximated to the sum of the Lennard-Jones potential for the M–X interaction and the polarization energy between M and X+. The recombination coefficients of some ionized gases at 288 °K and various pressures are calculated and compared with the observed data. The agreement is found to be satisfactory. The limitations of this theoretical approach are discussed.

scholarly journals Three-body recombination calculations with a two-body mapped grid method

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
T. Secker ◽  
J.-L. Li ◽  
P. M. A. Mestrom ◽  
S. J. J. M. F. Kokkelmans
Keyword(s):  
Grid Method ◽  
Three Body ◽  
Body Recombination

scholarly journals Atomic-state-dependent screening model for hot and warm dense plasmas

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Fuyang Zhou ◽  
Yizhi Qu ◽  
Junwen Gao ◽  
Yulong Ma ◽  
Yong Wu ◽  
...  
Keyword(s):  
Radiation Transport ◽  
Atomic State ◽  
Many Body ◽  
Dense Plasmas ◽  
Screening Model ◽  
State Dependent ◽  
Recombination Processes ◽  
Three Body ◽  
Many Body Interactions ◽  
Body Recombination

AbstractAn ion embedded in warm/hot dense plasmas will greatly alter its microscopic structure and dynamics, as well as the macroscopic radiation transport properties of the plasmas, due to complicated many-body interactions with surrounding particles. Accurate theoretically modeling of such kind of quantum many-body interactions is essential but very challenging. In this work, we propose an atomic-state-dependent screening model for treating the plasmas with a wide range of temperatures and densities, in which the contributions of three-body recombination processes are included. We show that the electron distributions around an ion are strongly correlated with the ionic state studied due to the contributions of three-body recombination processes. The feasibility and validation of the proposed model are demonstrated by reproducing the experimental result of the line-shift of hot-dense plasmas as well as the classical molecular dynamic simulations of moderately coupled ultra-cold neutral plasmas. Our work opens a promising way to treat the screening effect of hot and warm dense plasma, which is a bottleneck of those extensive studies in high-energy-density physics, such as atomic processes in plasma, plasma spectra and radiation transport properties, among others.

Sign in / Sign up

Export Citation Format

Share Document