Shock Wave Induced Decomposition of RDX: Time-Resolved Spectroscopy

2008 ◽  
Vol 112 (32) ◽  
pp. 7374-7382 ◽  
Author(s):  
James E. Patterson ◽  
Zbigniew A. Dreger ◽  
Maosheng Miao ◽  
Yogendra M. Gupta
Keyword(s):  
Shock Wave ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Induced Decomposition ◽  
Wave Induced

TEA CO2 Laser-Induced Plasma with a Plane Shock Wave Structure

1993 ◽  
Vol 47 (10) ◽  
pp. 1562-1566 ◽  
Author(s):  
K. Kagawa ◽  
M. Tani ◽  
H. Ueda ◽  
M. Sasaki ◽  
K. Mizukami
Keyword(s):  
Shock Wave ◽  
Laser Beam ◽  
Laser Plasma ◽  
Wave Structure ◽  
Plane Shock Wave ◽  
Plane Shock ◽  
Plasma Confinement ◽  
Time Resolved ◽  
Wave Induced ◽  
Gas Pressures

A TEA CO2 laser beam (500 mJ, 100 ns) has been focused on a Zn target at reduced ambient gas pressures. In order to confine the laser plasma into a limited space, a tube (7 × 7 × 20 mm) has been placed just in front of the target, and the laser beam has been focused through the tube on the target. The time-resolved spatial distributions of Zn emission lines show that emission intensity increases quickly with a distinct jump near the front of the plasma and that the emissions take place only in a limited thin layer. It is also shown that the displacement of the emission front is proportional to 0.6 power of time. These experimental results support the supposition that the plasma is excited by a plane shock wave induced by the laser bombardment. This laser plasma confinement technique shows the possibility of improving the sensitivity in laser microprobe spectrochemical analysis.

Shock Wave Induced Decomposition of RDX: Quantum Chemistry Calculations

2008 ◽  
Vol 112 (32) ◽  
pp. 7383-7390 ◽  
Author(s):  
Maosheng Miao ◽  
Zbigniew A. Dreger ◽  
James E. Patterson ◽  
Yogendra M. Gupta
Keyword(s):  
Shock Wave ◽  
Quantum Chemistry ◽  
Quantum Chemistry Calculations ◽  
Induced Decomposition ◽  
Wave Induced

Time-Resolved Vibrational Spectroscopy of Polytetrafluoroethylene Under Laser-Shock Compression

2017 ◽  
Vol 71 (12) ◽  
pp. 2643-2652
Author(s):  
Vinay Rastogi ◽  
Usha Rao ◽  
Shivanand Chaurasia ◽  
Chakkalakkal Davis Sijoy ◽  
Vinayak Mishra ◽  
...  
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Compression ◽  
Pressure Gauge ◽  
Time Resolved ◽  
Raman Spectroscopic ◽  
Wave Compression ◽  
Diamond Anvil ◽  
Wave Induced ◽  
Experimental Pressure

Shock-wave-induced high pressure and nanosecond time-resolved Raman spectroscopic experiments were performed to examine the dynamic response of polytetrafluoroethylene (PTFE) in confinement geometry targets. Time-resolved Raman spectroscopy was used to observe the pressure-induced molecular and chemical changes on nanosecond time scale. Raman spectra were measured as a function of shock pressure in the 1.2–2.4 GPa range. Furthermore, the symmetric stretching mode at 729 cm–1 of CF2 was compared to corresponding static high-pressure measurements carried out in a diamond anvil cell, to see if any general trend can be established. The symmetric stretching mode of CF2 at 729 cm–1 is the most intense Raman transition in PTFE and is very sensitive to change in pressure. Therefore, it can also be utilized as a pressure gauge for large amplitude shock wave compression experiments. A maximum blueshift of 12 cm–1 for the 729 cm–1 vibrational mode has been observed for the present experimental pressure range. A comparative study on the similarities and differences from the earlier work has been done in detail. One-dimensional radiation hydrodynamic simulations were performed to validate our shock compression results and are in very good agreement.

Time-resolved spectroscopy of light emission from plasma generated by a converging strong shock wave in water

2016 ◽  
Vol 109 (24) ◽  
pp. 244101 ◽  
Author(s):  
D. Yanuka ◽  
A. Rososhek ◽  
S. Efimov ◽  
M. Nitishinskiy ◽  
Ya. E. Krasik
Keyword(s):  
Shock Wave ◽  
Light Emission ◽  
Strong Shock ◽  
Strong Shock Wave ◽  
Time Resolved ◽  
Time Resolved Spectroscopy
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