Ultrafast Vibrational Spectroscopy of Shock Compression With Molecular Resolution

Lagutchev, Alexei; Brown, Kathryn E.; Carter, Jeffrey A.; Fu, Yabo; Fujiwara, Hirokazu; Wang, Zhaohui; Dlott, Dana D.

doi:10.1063/1.3295129

Cited by 1 publication

(5 citation statements)

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“…The shock target array has also been described previously [2,3]. The most notable improvement has been in the shock confinement.…”

Section: Experimental Apparatusmentioning

confidence: 98%

“…Originally, we used a CaF 2 window on-top of a layer of deuterated ethylene glycol contact liquid [1]. The drawbacks of that method were distortion of the probe pulses by the 3 mm thick window [2], our inability to precisely control the liquid layer thickness, and the trouble of replacing windows between runs. Now we use a spin-coated layer of PMMA 3-4 μm thick.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Any conventional shock experiment on a bulk material is unable to distinguish among molecules located in different molecular layers a short distance behind the shock front [1]. For this reason, we have been developing methods to study ultrafast shock compression of self-assembled molecular monolayers (SAMs) [2].…”

Section: Introductionmentioning

confidence: 99%

“…With a test bed of this type, it is possible to answer important questions about shock-molecule interactions, such as how does a shock pump energy into different parts of a molecule and how does this depend on moleculeshock orientation, etc. [2].…”

Section: Introductionmentioning

confidence: 99%

“…A shock-induced vibrational blueshift was not observed. It would be interesting to watch shock-induced chemical reactions in real time and in molecular layers closely related to explosives (explosive simulant mono-layers [2]), such as 4-nitrobenzenethiol (NBT) (the structure depicted in Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Nitro stretch probing of a single molecular layer to monitor shock compression with picosecond time resolution

Berg

Lagutchev

et al. 2012

AIP Conference Proceedings

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Abstract. Ultrafast shock compression vibrational spectroscopy experiments with molecular monolayers provide atomic-scale time and space resolution, which enables critical testing of reactive molecular simulations. Since the origination of this project, we have greatly improved the ability to detect shocked monolayers by nonlinear coherent vibrational spectroscopy with nonresonant suppression. In this study, we show new results on a nitroaromatic monolayer, where the nitro symmetric stretch is probed. A small frequency blue-shift under shock conditions compared to measurements with static high pressure shows the shock is ~1 GPa. The ability to flash-preheat the monolayer by several hundred K is demonstrated. In order to observe shock monolayer chemistry in real time, along with pre-heating, the shock pressure needs to be increased and methods to do so are described.

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“…The shock target array has also been described previously [2,3]. The most notable improvement has been in the shock confinement.…”

Section: Experimental Apparatusmentioning

confidence: 98%

Section: Experimental Apparatusmentioning

confidence: 99%