Picosecond time-resolved electronic spectroscopy in plate impact shock experiments: Experimental development

Abstract

An experimental method was developed to perform picosecond time-resolved electronic spectroscopy in single-event, plate impact, shock wave experiments. Several experimental difficulties had to be addressed due to the fast time resolution ͑100 ps͒ and short time duration ͑12.7 ns͒ of such experiments. Procedures are described to address the following experimental issues: ͑i͒ synchronization of the light source, detection equipment, and the shock event within the experimental duration, ͑ii͒ incorporation of a Nd:YAG laser ͑operative in a repetitive mode͒ into the experimental configuration, and ͑iii͒ sources of temporal dispersion. Representative results are shown from experiments performed on single crystal CdS. The developments described here are also expected to be useful for shock wave experiments involving Raman, fluorescence, or other types of spectroscopy which require the use of a laser.

Observation of wavelength shifts in ruby under shock compression to 36 GPa by time-resolved luminescence spectroscopy

“…[1][2][3] Luminescence spectroscopy, one of these techniques, has been used to study structural changes in materials under dynamic compression and release. 1,4 -6 Ruby luminescence has been extensively studied under both static 7,8 and dynamic compression, and results are used for pressure calibration.…”

Ultrafast transformation of graphite to diamond: An ab initio study of graphite under shock compression

“…5 However, experimental techniques have only recently been developed to perform in situ studies of chemical transformations in shocks. [6][7][8] Molecular and atomic scale information are difficult to experimentally obtain, and theoretical studies are necessary in order to develop simple chemical pictures for the high pressure-temperature behavior of the phase transformations of carbon.…”

High spectral resolution, real-time, Raman spectroscopy in shock compression experiments

“…18 The earlier work demonstrated that synchronizing the impact event to the laser firing is preferable to synchronizing the laser to the impact event. Because the excitation laser works in a repetitive mode, the key issue was to correlate a single event measurement with the repetitive firing of the laser.…”