Evidence of Multiple Trapping Sites for Excited Nitrogen Atoms in Solid Molecular Nitrogen

1961 ◽  
Vol 34 (3) ◽  
pp. 948-957 ◽  
Author(s):  
R. A. Hemstreet ◽  
J. R. Hamilton
Keyword(s):  
Molecular Nitrogen ◽  
Multiple Trapping ◽  
Excited Nitrogen ◽  
Trapping Sites

Multiple Trapping Sites for Hydrogen Atoms in Rare Gas Matrices

1960 ◽  
Vol 32 (4) ◽  
pp. 963-971 ◽  
Author(s):  
S. N. Foner ◽  
E. L. Cochran ◽  
V. A. Bowers ◽  
C. K. Jen
Keyword(s):  
Rare Gas ◽  
Hydrogen Atoms ◽  
Multiple Trapping ◽  
Trapping Sites

THE REACTIVE SPECIES IN ACTIVE NITROGEN

1962 ◽  
Vol 40 (6) ◽  
pp. 1082-1097 ◽  
Author(s):  
A. N. Wright ◽  
R. L. Nelson ◽  
C. A. Winkler
Keyword(s):  
Molecular Nitrogen ◽  
Reaction Vessel ◽  
Active Nitrogen ◽  
Atom Concentration ◽  
Vibrational Levels ◽  
Long Lifetime ◽  
Excited Nitrogen ◽  
A Minor ◽  
Hydrocarbon Reactions ◽  
Decomposition Of No

A study has been made of the discrepancy between the N-atom content of active nitrogen as inferred from the maximum HCN production from the reaction of many hydrocarbons, and that indicated by the extent of NO destruction. The HCN production from several hydrocarbons was similar at high reaction temperatures in a spherical reaction vessel, and was independent of reaction temperature in a cylindrical reaction vessel. The ratio (NO destroyed)/(HCN produced) was found to be independent of the mode of excitation òf the molecular nitrogen and of the N-atom concentration, and to be unaffected by the addition, upstream, of N2O or CO2. Although NH3 was found to be a minor product of the hydrocarbon reactions, HCN accounted for at least 96% of the N-atom content of the products under conditions where its formation is considered a measure of the N-atom concentration. The NO "titration" value, the maximum extent of HCN production from C2H4, and the destruction of NH3 after different times of decay of active nitrogen gave evidence that part of the NO reaction occurred, as does the NH3 reaction, with excited nitrogen molecules. The long lifetime of the N2* species capable of reaction with NO or NH3, as calculated from the above data, strongly favors its identification as low vibrational levels of the N2(A3∑u+) molecule. A consideration of the values for the NO/HCN, NH3/HCN, and NH3/NO ratios, after different times of decay, for poisoned and unpoisoned systems, suggested that the N2* responsible for the NH3 reaction is formed only during homogeneous recombination of N atoms, while the N2* responsible for reaction with NO might be produced by wall recombination as well. Possible reactions of excited molecules present in the active nitrogen – NO system that might lead to decomposition of NO without consumption of N atoms are discussed.

Hydrogen Dynamics and Tee Distribution of H Sites in Undoped a-Si:H and a-Ge:H

1991 ◽  
Vol 219 ◽  
Author(s):  
R. Shinar ◽  
X.-L. Wu ◽  
S. Mitra ◽  
J. Shinar
Keyword(s):  
Mass Spectrometry ◽  
Activation Energy ◽  
Long Range ◽  
Secondary Ion Mass Spectrometry ◽  
Ir Studies ◽  
Multiple Trapping ◽  
Ion Mass Spectrometry ◽  
Secondary Ion ◽  
Trapping Sites

ABSTRACTSecondary ion mass spectrometry and IR studies of long-range hydrogen motion in undoped a-Si:H and a-Ge:H of varying H content and microstructure are reviewed and discussed. In particular, their relation to the multiple trapping (MT) model, the role of microvoids, the significance of the Meyer-Neldel relation (MNR), and the nature of H sites is addressed. It is suggested that while the MT mechanism may be significant in a-Si:H of low H content Cfj, it is largely marginal in films where CH ≥ 10 at.% H and in a-Ge:H. Mono Si-H bonds on microvoid surfaces are apparently deep H trapping sites up to ∼ 400°C, but H is desorbed from such sites in a-Ge:H above 180°C. The MNR between the diffusional activation energy and prefactor is observed among the various a-Si:H and a-Ge:H, but its significance is questionable, and may be due to the MT mechanism only in low H content a-Si:H. The nature of the distribution of H sites is also discussed.

Multiple Trapping Sites for Hydrogen Atoms in Solid Argon

1959 ◽  
Vol 2 (2) ◽  
pp. 43-45 ◽  
Author(s):  
E. L. Cochran ◽  
V. A. Bowers ◽  
S. N. Foner ◽  
C. K. Jen
Keyword(s):  
Hydrogen Atoms ◽  
Multiple Trapping ◽  
Solid Argon ◽  
Trapping Sites

Multiple trapping sites for potassium atoms in argon matrices

1974 ◽  
Vol 48 (2) ◽  
pp. 143-144 ◽  
Author(s):  
H.J. Coufal ◽  
M. Burger ◽  
U. Nagel ◽  
E. Lüscher ◽  
K. Böning ◽  
...  
Keyword(s):  
Multiple Trapping ◽  
Argon Matrices ◽  
Trapping Sites

ESR of nitrogen atoms in multiple trapping sites—Nitrogen matrix

1978 ◽  
Vol 68 (5) ◽  
pp. 2252-2256 ◽  
Author(s):  
D. D. Delannoy ◽  
B. Tribollet ◽  
F. Valadier ◽  
A. Erbeia
Keyword(s):  
Multiple Trapping ◽  
Trapping Sites

scholarly journals Global modelling study (GSM TIP) of the ionospheric effects of excited <i>N<sub>2</sub></i>, convection and heat fluxes by comparison with EISCAT and satellite data for 31 July 1990

1996 ◽  
Vol 14 (12) ◽  
pp. 1362-1374 ◽  
Author(s):  
Yu. N. Korenkov ◽  
V. V. Klimenko ◽  
M. Förster ◽  
V. A. Surotkin ◽  
J. Smilauer
Keyword(s):  
Satellite Data ◽  
Molecular Nitrogen ◽  
Reaction Rates ◽  
Heat Fluxes ◽  
High Solar Activity ◽  
Plasma Parameters ◽  
Vibrationally Excited ◽  
Model Calculations ◽  
Excited Nitrogen ◽  
Good Agreement

Abstract. Near-earth plasma parameters were calculated using a global numerical self-consistent and time-dependent model of the thermosphere, ionosphere and protonosphere (GSM TIP). The model results are compared with experimental data of different origin, mainly EISCAT measurements and simultaneous satellite data (Ne and ion composition). Model runs with varying inputs of auroral FAC distributions, temperature of vibrationally excited nitrogen and photoelectron energy escape fluxes are used to make adjustments to the observations. The satellite data are obtained onboard Active and its subsatellite Magion-2 when they passed nearby the EISCAT station around 0325 and 1540 UT on 31 July 1990 at a height of about 2000 and 2200 km, respectively. A strong geomagnetic disturbance was observed two days before the period under study. Numerical calculations were performed with consideration of vibrationally excited nitrogen molecules for high solar-activity conditions. The results show good agreement between the incoherent-scatter radar measurements (Ne, Te, Ti) and model calculations, taking into account the excited molecular nitrogen reaction rates. The comparison of model results of the thermospheric neutral wind shows finally a good agreement with the HWM93 empirical wind model.

scholarly journals The effect of vibrationally excited nitrogen on the low-latitude ionosphere

1997 ◽  
Vol 15 (11) ◽  
pp. 1422-1428 ◽  
Author(s):  
B. Jenkins ◽  
G. J. Bailey ◽  
A. E. Ennis ◽  
R. J. Moffett
Keyword(s):  
Excited States ◽  
Atomic Oxygen ◽  
Molecular Nitrogen ◽  
Low Latitude ◽  
Vibrationally Excited ◽  
Model Calculations ◽  
Oxygen Ions ◽  
Ionosphere Model ◽  
Low Latitude Ionosphere ◽  
Excited Nitrogen

Abstract. The first five vibrationally excited states of molecular nitrogen have been included in the Sheffield University plasmasphere ionosphere model. Vibrationally excited molecular nitrogen reacts much more strongly with atomic oxygen ions than ground-state nitrogen; this means that more O+ ions are converted to NO+ ions, which in turn combine with the electrons to give reduced electron densities. Model calculations have been carried out to investigate the effect of including vibrationally excited molecular nitrogen on the low-latitude ionosphere. In contrast to mid-latitudes, a reduction in electron density is seen in all seasons during solar maximum, the greatest effect being at the location of the equatorial trough.

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