Dana D. Dlott

University of Illinois Urbana-Champaign

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Jeffrey R. Hill

Brigham Young University

Alexei Lagutchev

Purdue University West Lafayette

M. D. Fayer

Stanford University

Selezion A. Hambir

University of Illinois Urbana-Champaign

Will P. Bassett

Lawrence Livermore National Laboratory

David E. Hare

Lawrence Livermore National Laboratory

Lawrence Salvati

University of Illinois Urbana-Champaign

Mithun Bhowmick

Miami University

William L. Shaw

Lawrence Livermore National Laboratory

Kenneth S. Suslick

University of Illinois Urbana-Champaign

Cooperative Institutions

University of Illinois Urbana-Champaign

171

Stanford University

Urbana University

Chinese Academy of Sciences

University of Illinois System

Los Alamos National Laboratory

Pennsylvania State University

Centre National de la Recherche Scientifique

Lawrence Livermore National Laboratory

Georgia Institute of Technology

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Temperature dependent libron relaxation in naphthalene

The Journal of Chemical Physics (1984)

Claire L. Schosser Dana D. Dlott

The Raman linewidths of librons in naphthalene and perdeuteronaphthalene measured over a wide temperature range are compared with the recent calculation of Della Valle et al. [Chem. Phys. 74, 179 (1983)]. Excellent agreement with the Della Valle calculation is observed up to ∼60 K. The inclusion of an additional up-conversion pathway, not considered by Della Valle, involving scattering to the ∼175 cm−1 ‘‘butterfly’’ vibration extends the range of agreement to ∼200 K. The temperature dependence over the range 1.5 to 200 K can be entirely explained by energy relaxation via cubic anharmonic coupling. Picosecond Raman results on several other materials with the naphthalene crystal structure are in good agreement with a simplified version of the Della Valle calculation which assumes the cubic anharmonic matrix elements are equal for each possible decay pathway.

Picosecond

Atmospheric temperature range

Crystal (programming language)

10.1063/1.446795

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Citations (16)

Ultrafast dynamics of heat flow across molecules

Chemical Physics (2007)

Zhaohui Wang David G. Cahill Jeffrey A. Carter Yee Kan Koh Alexei Lagutchev

Temperature jump

10.1016/j.chemphys.2007.12.017

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Citations (53)

Molecular probing of shocked rhodamine 6G in liquid water

AIP conference proceedings (2018)

Erin J. Nissen Dana D. Dlott

We have developed a tabletop apparatus for generating planar shock waves in miniature liquid cuvettes from the impact of a laser driven flyer plate. The liquid is sandwiched between an optical window and a thin aluminum lid, used to prevent evaporation. Photon Doppler velocimetry is performed on both the flyer plate and the lid to confirm a reproducible planar shock. Our current array design has 55 microcuvettes, each holding 125 nL, on a glass substrate, and we often do 100 shots per day. This technique was applied to investigate the photophysics and photochemistry of a dye probe rhodamine 6G in shock compressed water. We developed an advanced spectroscopy system that employs a quasi-continuous laser excitation pulse and a spectrograph with streak camera to measure time-dependent photoemission spectra. The shocked dye shows an immediate loss of emission intensity due to enhanced intersystem crossing followed by a more gradual and long-lasting increase in emission intensity over about 150 ns, likely due to proton transfer from the shocked water to the dye molecules.

Rhodamine 6G

Cuvette

10.1063/1.5044902

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Citations (1)

Experimental determination of the triplet exciton intermolecular interaction matrix element and the exciton-phonon scattering rate in molecular crystals

Chemical Physics Letters (1976)

Dana D. Dlott M. D. Fayer

Biexciton

Scattering rate

Matrix (chemical analysis)

10.1016/0009-2614(76)80816-0

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Citations (46)

Probing the Molecular Structure of Electrode−Electrolyte Interfaces with Broadband Sum-Frequency Generation

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2012)

Björn Braunschweig Robert Kutz Prabuddha Mukherjee Dana D. Dlott A. Więckowski

Abstract not Available.

10.1149/ma2012-01/42/1564

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A thin-film Hugoniot measurement using a laser-driven flyer plate

APS (2011)

Hiroki Fujiwara Kathryn E. Brown Dana D. Dlott

A method is described where a tabletop laser-driven flyer plate apparatus using ~8 ns launching pulses from a Nd:YAG laser is used to determine the Hugoniot of a thin layer of transparent materials impacted by 25 μm thick flyers moving up to 2 km/s, producing shocks that were fully supported for 8 ns. In this method, a high-speed 8 GHz fiberoptic displacement interferometer looks through the transparent sample, which has an ultrathin 50% reflecting mirror deposited on its surface, to simultaneously measure Us and Up on a single shot. The initial results obtained on a 31 μm thick film of PMMA were in excellent agreement with the Hugoniot literature.

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Instrumentation for Spectroscopy of Impact Initiation of Reactive Materials

Dana D. Dlott

Abstract : Instrumentation was acquired that allowed for acquisition of emission spectra with high time and wavelength resolution. The acquired instruments were fabricated into a time-resolved spectroscopy system. This system will be used to study the emission from small particles of reactive nanomaterials that are initiated by impact with a flyer plate. The emission spectra so obtained will be used to develop a fundamental understanding of how these materials are initiated by shock waves.

Instrumentation

Nanomaterials

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Dynamics of shocks in laser-launched flyer plates probed by photon Doppler velocimetry

Bulletin of the American Physical Society (2013)

Alexander D. Curtis Dana D. Dlott

We investigated the launch and impact with glass targets for four different thicknesses of Al laser-launched flyer plates by monitoring the flight with photon Doppler velocimetry (PDV). The amplitudes and damping times of the reverberating shocks in the flyers, created by short laser pulse launching, were investigated as a function of pulse duration using 10 or 20 ns laser pulses. The shorter pulse duration showed a surprisingly more efficient damping process in the thicker flyers. The durations of the supported shocks in the glass targets were also measured as a function of flyer thickness. The supported shock durations were significantly shorter than the common picture of shock round-trip transit time in the flyer.

Velocimetry

Pulse duration

Launched

Source

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SHOCK COMPRESSION INDUCED HOT SPOTS IN ENERGETIC MATERIAL DETECTED BY THERMAL IMAGING MICROSCOPY

Proceedings of the 74th International Symposium on Molecular Spectroscopy (2014)

Mingwei Chen Dana D. Dlott

Thermal shock

10.15278/isms.2014.tb10

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Time-Resolved Microscopy Analysis of Laser Photothermal Imaging Media

Journal of Imaging Science and Technology (2006)

F. Richard Kearney Hyunung Yu Dana D. Dlott

Methods for understanding the fundamental mechanisms of laser photothermal imaging are described and applied to model imaging media. The light response is characterized with a series of Gaussian laser pulses of varying intensities and durations. The results are compared to a reference model, the "local fluence" model, that assumes the likelihood of exposure at a given pulse duration depends solely on the laser fluence received at that location. The mechanisms underlying the material behavior are studied with time-resolved microscopy using a variety of exposure and viewing conditions. The imaging media have in common a silicone rubber (polydimethylsiloxane) coating that can be removed by a single laser pulse to form an imaged spot that attracts ink. They differ in having a thin-film absorber layer, a volume absorber layer, or a combination of volume absorber and energetic underlayer. The thin-film media are the least sensitive with longer duration microsecond pulses but the most sensitive with nanosecond pulses, which is explained using a thermal conduction model. The volume absorbing media show deviations from the local fluence model that indicate the existence of useful dot gain properties which improve sensitivity. Time-resolved microscopy shows that this dot gain results from high-speed mechanical effects caused by hot gas trapped under a silicone rubber balloon.

Silicone rubber

Nanosecond

Pulse duration

Microsecond

10.2352/j.imagingsci.technol.(2006)50:5(401)

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Citations (7)