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Real time analysis of PETN detonation products

Description: The freely expanding gases from the detonation of pentaerythritol tetranitrate (PETN) pellet were analyzed as rapidly as the molecules arrived at the mass spectrometer detector. It was found that all of the products arriving at the detector earliest, irrespective of mass, had the same velocity, 11 km s/sup -1/ and peaked at 5 km s/sup -1/. The width of the time distributions varied from one species to another. Mass and velocity spectra of the important products were obtained and the most intens… more
Date: January 1, 1985
Creator: Blais, N.C. & Valentini, J.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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THERMAL CONDUCTIVITY OF HELIUM AND HYDROGEN AT HIGH TEMPERATURES

Description: A steady-state hot wire method for measuring the thermal conductivity of light gases in the temperature range 1200 to 2100 K is described. In contrast to other methods, free convection currents and large temperature gradients occur; convection effects are shown to be negligible, and an experimental procedure for eliminating the large gradient effects is described. The thermal conductivity of helium is found to follow the equation deg F. Cores o x 10/sup 6/ = 991 + 0.678(T - 1200) cal/sec cm deg… more
Date: April 1, 1959
Creator: Mann, J.B. & Blais, N.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High energy-intensity atomic oxygen beam source for low earth orbit materials degradation studies

Description: A high intensity (10/sup 19/O-atoms/s-sr) high energy (5 eV) source of oxygen atoms has been developed that produces a total fluence of 10/sup 22/ O-atoms/cm/sup 2/ in less than 100 hours of continuous operation at a distance of 15 cm from the source. The source employs a CW CO/sub 2/ laser sustained discharge to form a high temperature (15,000 K) plasma in the throat of a 0.3-mm diameter nozzle using 3--8 atmospheres of rare gas/O/sub 2/ mixtures. Visible and infrared photon flux levels of 1 w… more
Date: January 1, 1988
Creator: Cross, J. B. & Blais, N. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Real time analysis of detonation products. [Cyclotrimethylene trinitranamine (RDX), hexanitrostilbene (HNS)]

Description: We have determined the mass spectrum and the time evolution of the freely expanding products of highly shocked and detonating substances. So far we have studied pentaerythritol tetranitrate (PETN), hexanitrostilbene (HNS), cyclotrimethylene trinitranamine (RDX) and nitric oxide (NO). For the case of NO, we find that N/sub 2/ and O/sub 2/ are important products of the detonation. Other reaction products are N/sub 2/O and NO/sub 2/, some of which arise from secondary reactions between O/sub 2/ an… more
Date: January 1, 1987
Creator: Blais, N.C.; Greiner, R. & Fernandez, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Detonation reaction steps frozen by free expansion and analyzed by mass spectrometry

Description: Detonation reactions in small pellets of explosive are frozen by free expansion into a large vacuum chamber and analyzed by time-of-flight mass spectrometry. Sensitive explosives like PETN, RDX, and HMX show rapidly evolving reaction zones and mostly simple products like H[sub 2]O, CO, N[sub 2], and CO[sub 2]. Less sensitive explosives like TATB, HNS, and TNT show slower evolution of the reaction zone, and more complex products in addition to the simple ones seen in PETN. Isotopic substitution … more
Date: January 1, 1993
Creator: Greiner, N. R.; Fry, H. A.; Blais, N. C. & Engelke, R. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detonation reaction steps frozen by free expansion and analyzed by mass spectrometry

Description: Detonation reactions in small pellets of explosive are frozen by free expansion into a large vacuum chamber and analyzed by time-of-flight mass spectrometry. Sensitive explosives like PETN, RDX, and HMX show rapidly evolving reaction zones and mostly simple products like H{sub 2}O, CO, N{sub 2}, and CO{sub 2}. Less sensitive explosives like TATB, HNS, and TNT show slower evolution of the reaction zone, and more complex products in addition to the simple ones seen in PETN. Isotopic substitution … more
Date: May 1, 1993
Creator: Greiner, N. R.; Fry, H. A.; Blais, N. C. & Engelke, R. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detonation chemistry studies of energetic materials using laboratory scale samples

Description: We describe an apparatus by which the detonation products of an explosive can be identified and whose relative concentrations can be determined quantitatively. These measurements can be made on products that have been formed in less than one microsecond after the passage of the detonation wave. The technique is based on the rapid quenching of chemical reactions by virtue of the free expansion of the products into vacuum. Of course, products that have been formed over a longer period of time and… more
Date: January 1, 1989
Creator: Blais, N. C.; Greiner, N. R. & Fernandez, W. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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