THE REACTIONS OF DIMETHYL- AND TRIMETHYL-AMINES WITH ATOMIC HYDROGEN

1958 ◽  
Vol 36 (8) ◽  
pp. 1171-1173 ◽  
Author(s):  
Z. M. George ◽  
A. N. Wright ◽  
C. A. Winkler
Keyword(s):  
Hydrogen Cyanide ◽  
Atomic Hydrogen ◽  
Hydrogen Atoms

The reactions of hydrogen atoms with dimethyl- and trimethyl-amines produced mainly methane, together with relatively large quantities of ethane and small amounts of hydrogen cyanide. Dimethylamine was also a product of the trimethylamine reaction.

The reaction of atomic hydrogen with methyl cyanide

1970 ◽  
Vol 48 (23) ◽  
pp. 3619-3622 ◽  
Author(s):  
J. W. S. Jamieson ◽  
G. R. Brown ◽  
J. S. Tanner
Keyword(s):  
Kinetic Parameters ◽  
Electric Discharge ◽  
Hydrogen Cyanide ◽  
Atomic Hydrogen ◽  
Hydrogen Atoms ◽  
Flow Rates ◽  
Methyl Cyanide ◽  
Different Temperatures ◽  
A Minor ◽  
Minor Extent

The reaction of hydrogen atoms, produced by electric discharge, with methyl cyanide vapor has been reinvestigated at seven different temperatures between 40 and 507 °C over a range of methyl cyanide flow rates from 2 to 25 μmoles/s. As in the previous limited investigation the products have been found to be hydrogen cyanide, methane, and ethane, but the present results indicate the presence of chain characteristics to a minor extent, propagated by CN. Kinetic parameters for formation of the products have been evaluated, as kHCN = 3.55 × 10−12 e−5816/RT; [Formula: see text]; and [Formula: see text].

THE REACTION OF ATOMIC HYDROGEN WITH FORMAMIDE VAPOR

1963 ◽  
Vol 41 (6) ◽  
pp. 1568-1574 ◽  
Author(s):  
J. W. S. Jamieson
Keyword(s):  
Thermal Decomposition ◽  
Free Radical ◽  
Reaction Temperature ◽  
Hydrogen Cyanide ◽  
Atomic Hydrogen ◽  
Main Product ◽  
Chain Mechanism ◽  
Hydrogen Atoms ◽  
Radical Chain ◽  
Wide Range

Hydrogen cyanide was the main product of the reaction of hydrogen atoms with formamide vapor; its rate of production was fairly rapid and completely independent of reaction temperature over a wide range. If a hydrogen is abstracted from formamide it must be one of the hydrogens bonded to nitrogen. The results of this investigation suggest the possibility of another free radical chain mechanism, which does not involve hydrogen atoms, for the thermal decomposition of formamide vapor.

THE REACTION OF ACTIVE NITROGEN WITH PROPYLENE

1952 ◽  
Vol 30 (12) ◽  
pp. 915-921 ◽  
Author(s):  
G. S. Trick ◽  
C. A. Winkler
Keyword(s):  
Double Bond ◽  
Nitrogen Atom ◽  
Hydrogen Cyanide ◽  
Atomic Hydrogen ◽  
Atomic Nitrogen ◽  
Active Nitrogen

The reaction of nitrogen atoms with propylene has been found to produce hydrogen cyanide and ethylene as the main products, together with smaller amounts of ethane and propane and traces of acetylene and of a C4 fraction. With excess propylene, the nitrogen atoms were completely consumed and for the reaction at 242 °C., 0.77 mole of ethylene was produced for each mole of excess propylene added. For reactions at lower temperatures, less ethylene was produced. The proposed mechanism involves formation of a complex between the nitrogen atom and the double bond of propylene, followed by decomposition to ethylene, hydrogen cyanide, and atomic hydrogen. The ethylene would then react with atomic nitrogen in a similar manner.

scholarly journals Сечения образования ионов He-=SUP=-+-=/SUP=- в различных электронных состояниях при столкновениях ионов He-=SUP=-2+-=/SUP=- с атомами водорода

2020 ◽  
Vol 90 (6) ◽  
pp. 895
Author(s):  
А.А. Басалаев ◽  
В.В. Кузьмичев ◽  
М.Н. Панов ◽  
О.В. Смирнов
Keyword(s):  
Kinetic Energy ◽  
Electron Capture ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Precision Measurements ◽  
Capture Cross ◽  
Hydrogen Atoms ◽  
Hydrogen Target ◽  
Degree Of Dissociation ◽  
Capture Cross Sections

Using collision spectroscopy based on precision measurements of the kinetic energy of projectile ions that capture an electron, we measured the state selective electron capture cross sections of formation of He^+(n) ions at collision 3^He^{2 +} ions with an energy of E = 1.4-10 keV/a.m.u. with hydrogen atoms. The atomic hydrogen target with a degree of dissociation 78% at a temperature of tungsten dissociation cell 2180K has been made.

Photodissociation of H2 near Threshold Energies

1970 ◽  
Vol 25 (2) ◽  
pp. 237-242 ◽  
Author(s):  
F. J. Comes ◽  
U. Wenning
Keyword(s):  
Electric Field ◽  
Cross Section ◽  
Configuration Interaction ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Hydrogen Atoms ◽  
Dissociation Cross Section ◽  
Excited Molecules ◽  
Threshold Energies ◽  
Near Threshold

Abstract Measurements of the atomic hydrogen fluorescence (Lyα) yield important information on the dissociation behavior of molecular hydrogen under photon impact. Under certain assumptions the dissociation cross section of the molecule can be deduced from such experiments. By applying an appropriate electric field in the observation region those dissociations leading to the formation of metastable hydrogen atoms can be quantitatively determined. This information opens the possibility to describe the predissociation of the excited H2-molecules in the C-, D-and B″-states. The experiments show that the excited molecules in these particular states dissociate into H(1S) and H(2S) by configuration interaction with the B′-state.

Stationary inverted Lyman populations and free-free and bound-free emission of lower-energy state hydride ion formed by an exothermic catalytic reaction of atomic hydrogen and certain group I catalysts

Open Physics ◽  
2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Randell Mills ◽  
William Good ◽  
Peter Jansson ◽  
Jiliang He
Keyword(s):  
Catalytic Reaction ◽  
Atomic Hydrogen ◽  
Microwave Plasma ◽  
Energy State ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Hydrogen Atoms ◽  
Hydride Ion ◽  
Group I ◽  
Excess Power

AbstractRb+ to Rb2+ and 2K+ to K + K2+ each provide a reaction with a net enthalpy equal to the potential energy of atomic hydrogen. The presence of these gaseous ions with thermally dissociated hydrogen formed a plasma having strong VUV emission with a stationary inverted Lyman population. Significant Balmer α line broadening of 18 and 9 eV was observed from a rt-plasma of hydrogen with KNO3, and RbNO3, respectively, compared to 3 eV from a hydrogen microwave plasma. The reaction was exothermic since excess power of about 20 mW/cc was measured by Calvet calorimetry. We propose an energetic catalytic reaction involving a resonance energy transfer between hydrogen atoms and Rb+ or 2K+ to form a very stable novel hydride ion. Its predicted binding energy of 3.0471 eV with the fine structure was observed at 4071 Å, and its predicted bound-free hyperfine structure lines matched those observed for about 40 lines to within.01 percent. Characteristic emission from each catalyst was observed. This catalytic reaction may pump a CW HI laser.

Curve-crossing collisions of excited lead atoms in flames

1981 ◽  
Vol 376 (1767) ◽  
pp. 545-564 ◽  
Keyword(s):  
Rate Constant ◽  
Atomic Hydrogen ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Model Systems ◽  
Attractive Potential ◽  
Hydrogen Atoms ◽  
Lennard Jones ◽  
Increasing Temperature ◽  
Curve Crossing

Lead atoms, present as a trace additive in a series of premixed H 2 –N 2 –O 2 flames, were excited to the 7 3 P o 1 state by 405.8 nm radiation from a nitrogen-pumped dye laser. Rate constants for spin-orbit relaxation to the 7 3 P o 0 state were obtained separately for collisions with atomic hydrogen and for collisions with the bulk flame gas, by measuring the relative intensities of fluorescence at 364.0 and 368.3 nm as a function of distance from the reaction zone in each flame. For hydrogen atoms the rate constant is typically 1 x 10 -9 cm 3 molecule -1 s -1 , decreasing with increasing temperature; for the bulk flame gas the rate constant is typically 1 x 10 -11 cm 3 molecule -1 s -1 , increasing with increasing temperature. Numerical calculations for model systems, with the use of Morse and Lennard-Jones potentials to describe the interaction of the colliding species, show that the negative temperature coefficient found for atomic hydrogen can be attributed to the crossing of attractive potential curves, corresponding to bound excited states of PbH.

scholarly journals Design of Transversal Phase Space Meter for Atomic Hydrogen Beam Source

2016 ◽  
Vol 40 ◽  
pp. 1660101
Author(s):  
A. S. Belov
Keyword(s):  
Phase Space ◽  
Atomic Beam ◽  
Atomic Hydrogen ◽  
Ion Beam ◽  
Longitudinal Velocity ◽  
Sensitive Detector ◽  
Hydrogen Atoms ◽  
Beam Source ◽  
Hydrogen Beam ◽  
Beam Technique

For optimization of polarized atomic beam sources apparatus it is important to have detailed information about characteristics of sources of hydrogen atoms, especially, taking into account present intensity limitations of polarized atomic beam sources. Usually, longitudinal velocity distribution of hydrogen atoms produced by RF dissociator is measured while transversal phase space of unpolarized atomic hydrogen beams was not measured up to now. In this work we report and discuss a design of transversal phase space meter for pulsed atomic hydrogen beam source. The meter design is based on “two slits” method which is well known from ion beam technique. Specific feature of the meter are movable sensitive detector of hydrogen atoms and molecules.

Reaction of atomic hydrogen with tetrafluoroethene

1969 ◽  
Vol 47 (10) ◽  
pp. 1696-1698
Author(s):  
Lei Teng ◽  
W. E. Jones
Keyword(s):  
Electric Discharge ◽  
Discharge Tube ◽  
Atomic Hydrogen ◽  
Hydrogen Atoms

Hydrogen atoms, generated in a Wood's electric discharge tube, were allowed to react with tetrafluoroethene. The products of the reaction were found to be HF, C2F3H, C2H2, C2F2H2, C2F4H2, C2FH3, C2H4, and CHF3. The formation of the products with the exception of HF was studied quantitatively from 30–330 °C.

Shock-wave observations of rate constants for atomic hydrogen recombination from 2500 to 7000 °K: collisional stabilization by exchange of hydrogen atoms

1969 ◽  
Vol 310 (1501) ◽  
pp. 253-276 ◽  
Keyword(s):  
Shock Waves ◽  
Rate Constant ◽  
Rate Constants ◽  
Atomic Hydrogen ◽  
Functional Form ◽  
Kcal Mole ◽  
Hydrogen Atoms ◽  
Hydrogen Molecules ◽  
Hydrogen Recombination ◽  
Equilibrium Dissociation

Rate constants for the recombination of atomic hydrogen with hydrogen molecules, hydrogen atoms, and argon atoms as the third bodies are presented in functional form for the range of temperatures from about 2500 to 7000 °K and are critically compared with the results of other workers. The rate constants are evaluated from detailed analyses of spectrum-line reversal measurements of the fall in temperature accompanying dissociation behind shock waves in gas mixtures containing 20, 40, 50 and 60% of hydrogen in argon. The rate constants for recombination with hydrogen molecules ( k -1 ) and argon atoms ( k -3 ) fit the equations log 10 k -1 = 15.243 - 1.95 x 10 -4 T cm 6 mole -2 s -1 , log 10 k -3 = 15.787 - 2.75 x 10 -4 T cm 6 mole -2 s -1 , with a standard deviation of 0.193 in log 10 k -1 . The rate constant for recombination with hydrogen atoms is about ten times larger than these at 3000 °K and shows a steep inverse dependence on temperature ( ~ T -6 ) above 4000 °K. Below this temperature the power of this dependence decreases rapidly and there is strong evidence that the value of this rate constant has a maximum around 3000 °K. This behaviour is interpreted on the basis of a process of collisional stabilization by atom exchange, requiring an activation energy around 8 kcal mole -1 and taking place under conditions of vibrational adiabaticity. The over-all results indicate that the assumption of equality between the equilibrium constant and the ratio of the rate constants for dissociation and recombination is valid throughout the region of non-equilibrium dissociation and at all temperatures in the shock waves examined.

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