ESR studies of a nitrogen defect in irradiated potassium azide

1979 ◽  
Vol 70 (12) ◽  
pp. 5358-5361
Author(s):  
R. C. Turner ◽  
F. H. Stout ◽  
T. G. Trimm
Keyword(s):  
Potassium Azide

Effects of potassium azide on soil microbial populations and soil enzymatic activities

1975 ◽  
Vol 21 (4) ◽  
pp. 565-570 ◽  
Author(s):  
W. D. Kelley ◽  
R. Rodriguez-Kabana
Keyword(s):  
Soil Enzyme ◽  
Soil Microflora ◽  
Microbial Populations ◽  
Bacterial Populations ◽  
Soil Microbial ◽  
Fungal Populations ◽  
Potassium Azide ◽  
Time Changes ◽  
Bacteria And Fungi ◽  
Microbial Numbers

Preplant applications of potassium azide (KN3) to pine nursery beds were evaluated for effect on the soil microflora and on soil enzyme activity where either plastic-sealing or water-sealing techniques were used. Two weeks after incorporation of azide (0–224 kg/ha), soil samplings revealed reduced populations of bacteria and fungi and a corresponding decline in invertase and amylase activities. These effects were proportionate to the amount of azide used and were more pronounced in plastic-sealed plots. Phosphatase activity was little affected. Five weeks after azide application, bacterial populations were higher in treated plots than in controls. Greater numbers of bacteria were recorded from plastic-sealed plots and highest populations coincided with plots receiving the highest rates of azide, regardless of the sealing technique. Fungal populations at this sampling were generally less in treated plots than in the controls, but were higher under plastic seal. At this time, changes in invertase and amylase activities did not correspond to increased microbial numbers. Sixteen weeks after applications of KN3, bacterial populations in treated plots did not differ significantly from controls, but remained higher in plastic-sealed than water-sealed plots. Fungal populations under plastic seal had changed little and remained significantly lower in treated water-sealed plots than in controls. The earlier recorded reduction in invertase and amylase activities was still evident at the final sampling.

Potassium Azide (Sodium Azide)

2007 ◽  
pp. 139-141 ◽  
Author(s):  
M. W. Miller ◽  
L. F. Audrieth ◽  
W. F. Filbert
Keyword(s):  
Sodium Azide ◽  
Potassium Azide

15N Labelling: Potassium azide, tetrazoles and imidazoles

1976 ◽  
Vol 59 (1) ◽  
pp. 256-259 ◽  
Author(s):  
Curt Wentrup ◽  
Célestin Thétaz
Keyword(s):  
15N Labelling ◽  
Potassium Azide

Spectra of sodium and potassium azide crystals coloured by ultra-violet and X -ray radiation

1959 ◽  
Vol 251 (1264) ◽  
pp. 27-40 ◽  
Keyword(s):  
Sodium Salt ◽  
Ultra Violet ◽  
Liquid Nitrogen Temperature ◽  
Mechanism Of Formation ◽  
Potassium Salts ◽  
Absorption Bands ◽  
X Ray ◽  
Rate Of Increase ◽  
Potassium Azide ◽  
Sodium And Potassium

The spectra of sodium and potassium azide crystals that had been coloured by irradiation with both ultra-violet and X-ray radiation for varying periods at liquid-nitrogen temperature have been recorded. From these results and from measurements of the rate of increase of intensity of the various absorption bands with time, together with the changes observed on raising the temperature, the nature and mechanism of formation of some of the centres are deduced. The different behaviour of the sodium and potassium salts under irradiation and the different effects produced by the two types of irradiation, particularly with the sodium salt, are discussed.

Satellite EPR resonances of the N4− radical in ultraviolet irradiated potassium azide

1982 ◽  
Vol 77 (3) ◽  
pp. 1175-1178 ◽  
Author(s):  
James S. Willis ◽  
Peter Pella
Keyword(s):  
Potassium Azide

Paramagnetic centers in potassium azide irradiated at low temperature

1962 ◽  
Vol 23 (1-2) ◽  
pp. 157-160 ◽  
Author(s):  
R.B. Horst ◽  
J.H. Anderson ◽  
D.E. Milligan
Keyword(s):  
Low Temperature ◽  
Paramagnetic Centers ◽  
Potassium Azide

Variable temperature and pressure Raman spectra of potassium azide KN3

1982 ◽  
Vol 12 (3) ◽  
pp. 300-303 ◽  
Author(s):  
M. Y. Khilji ◽  
W. F. Sherman ◽  
G. R. Wilkinson
Keyword(s):  
Raman Spectra ◽  
Variable Temperature ◽  
Potassium Azide ◽  
Temperature And Pressure

The thermal decomposition of potassium azide

1952 ◽  
Vol 215 (1121) ◽  
pp. 265-277 ◽  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Vapour Pressure ◽  
Surface Defects ◽  
Interface Reaction ◽  
Linear Process ◽  
Decay Process ◽  
Previous Theory ◽  
Electron Traps ◽  
Potassium Azide

Measurements of the rate of decomposition of solid potassium azide in hard vacuum and in a controlled vapour pressure of potassium are reported. Some observations of F -centre formation and decay allow a model for the trapped exciton to be formulated. This concept of a coloration complex is consistent with the previous theory postulated for the photo-chemical decomposition, with the F -centre bleaching rates and with the ineffectiveness of pre-irradiation on subsequent thermal decomposition. The thermal decomposition consists of an initial decay process, associated with anomalous groups of surface defects, followed by a linear process corresponding to an interface reaction. Nucleus formation and growth are absent because of the volatility of the metallic product. The decomposition is catalyzed by the presence of a constant vapour pressure of potassium, the increase in rate being due solely to a reduction in the activation energy of the reaction by the provision of electron traps other than vacant anion sites.

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