Time-Resolved Electronic Spectroscopy To Examine Shock-Wave-Induced Changes in Anthracene Single Crystals

2008 ◽  
Vol 112 (20) ◽  
pp. 7761-7766 ◽  
Author(s):  
Naoki Hemmi ◽  
Zbigniew A. Dreger ◽  
Yogendra M. Gupta
Keyword(s):  
Shock Wave ◽  
Single Crystals ◽  
Electronic Spectroscopy ◽  
Time Resolved ◽  
Induced Changes ◽  
Wave Induced

Shock Wave Induced Decomposition Chemistry of Pentaerythritol Tetranitrate Single Crystals:  Time-Resolved Emission Spectroscopy

2002 ◽  
Vol 106 (2) ◽  
pp. 247-256 ◽  
Author(s):  
Zbigniew A. Dreger ◽  
Yuri A. Gruzdkov ◽  
Yogendra M. Gupta ◽  
Jerry J. Dick
Keyword(s):  
Shock Wave ◽  
Single Crystals ◽  
Emission Spectroscopy ◽  
Pentaerythritol Tetranitrate ◽  
Time Resolved ◽  
Induced Decomposition ◽  
Decomposition Chemistry ◽  
Wave Induced

Shock wave induced changes in superconductivity in YBa2Cu3O7−δ

1989 ◽  
Vol 55 (15) ◽  
pp. 1575-1577 ◽  
Author(s):  
L. E. Murr ◽  
C. S. Niou ◽  
S. Jin ◽  
T. H. Tiefel ◽  
A. C. W. P. James ◽  
...  
Keyword(s):  
Shock Wave ◽  
Induced Changes ◽  
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.

Time-Resolved Spectroscopic Measurements of Shock-Wave Induced Decomposition in Cyclotrimethylene Trinitramine (RDX) Crystals: Anisotropic Response

2010 ◽  
Vol 114 (43) ◽  
pp. 11560-11566 ◽  
Author(s):  
Nhan C. Dang ◽  
Zbigniew A. Dreger ◽  
Yogendra M. Gupta ◽  
Daniel E. Hooks
Keyword(s):  
Shock Wave ◽  
Time Resolved ◽  
Spectroscopic Measurements ◽  
Cyclotrimethylene Trinitramine ◽  
Induced Decomposition ◽  
Wave Induced

Shock Wave-Induced Phase Transition in RDX Single Crystals

2007 ◽  
Vol 111 (37) ◽  
pp. 10897-10904 ◽  
Author(s):  
James E. Patterson ◽  
Zbigniew A. Dreger ◽  
Yogendra M. Gupta
Keyword(s):  
Phase Transition ◽  
Shock Wave ◽  
Single Crystals ◽  
Wave Induced

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

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.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

The effect of shock-wave loading on transformation temperatures, elastic and anelastic properties of β′ 1 Cu-Al-Ni martensitic single crystals

2002 ◽  
Vol 82 (12) ◽  
pp. 2419-2440
Author(s):  
S. Golyandin ◽  
S. Kustov ◽  
S. Nikanorov ◽  
K. Sapozhnikov ◽  
A. Sinani ◽  
...  
Keyword(s):  
Shock Wave ◽  
Single Crystals ◽  
Shock Wave Loading ◽  
Wave Loading ◽  
Transformation Temperatures
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