Photon emission from metals under fast nondestructive loading

Абрамова, К. Б.; Rusakov, A.I.; Semenov, A. A.; Щербаков, И. П.

doi:10.1063/1.372310

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Another possible mechanism of molecular desorption in LIAD is related to substrate surface deformation by the generated acoustic wave and the subsequent formation of nonequilibrium surface electron states due to migration and annihilation of solid dislocations. 40 These electron states vary with the material, and range from formation of localized holes near the top of the d-band for d-metals 41 to generation of strong electric fields within the surface cracks for dielectrics. 42 In any case, such states have an energy excess and could serve as an energy source for desorbing molecules.…”

Section: G )mentioning

confidence: 99%

Laser-Driven Acoustic Desorption of Organic Molecules from Back-Irradiated Solid Foils

et al. 2007

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Laser-induced acoustic desorption (LIAD) from thin metal foils is a promising technique for gentle and efficient volatilization of intact organic molecules from surfaces of solid substrates. Using the single-photon ionization method combined with time-of-flight mass spectrometry, we have examined the neutral component of the desorbed flux in LIAD and compared it to that from direct laser desorption. These basic studies of LIAD, conducted for molecules of various organic dyes (rhodamine B, fluorescein, anthracene, coumarin, BBQ), have demonstrated detection of intact parent molecules of the analyte even at its surface concentrations corresponding to a submonolayer coating. In some cases (rhodamine B, fluorescein, BBQ), the parent molecular ion peak was accompanied by a few fragmentation peaks of comparable intensity, whereas for others, only peaks corresponding to intact parent molecules were detected. At all measured desorbing laser intensities (from 100 to 500 MW/cm2), the total amount of desorbed parent molecules depended exponentially on the laser intensity. Translational velocities of the desorbed intact molecules, determined for the first time in this work, were of the order of hundreds of meters per second, less than what has been observed in our experiments for direct laser desorption, but substantially greater than the possible perpendicular velocity of the substrate foil surface due to laser-generated acoustic waves. Moreover, these velocities did not depend on the desorbing laser intensity, which implies the presence of a more sophisticated mechanism of energy transfer than direct mechanical or thermal coupling between the laser pulse and the adsorbed molecules. Also, the total flux of desorbed intact molecules as a function of the total number of desorbing laser pulses, striking the same point on the target, decayed following a power law rather than an exponential function, as would have been predicted by the shake-off model. To summarize, the results of our experiments indicate that the LIAD phenomenon cannot be described in terms of simple mechanical shake-off or direct laser desorption. Rather, they suggest that multistep energy-transfer processes are involved. Two possible (and not mutually exclusive) qualitative mechanisms of LIAD that are based on formation of nonequilibrium energy states in the adsorbate-substrate system are proposed and discussed.

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Section: G )mentioning

confidence: 99%

Laser-Driven Acoustic Desorption of Organic Molecules from Back-Irradiated Solid Foils

et al. 2007

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“…Only few papers are related to the investigation of EML and PML. The papers related to the studies of EML and PML are: .…”

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confidence: 99%

Survey of the literature on mechanoluminescence from 1605 to 2013

2014

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Mechanoluminescence (ML) is a type of luminescence induced by any mechanical action on solids. The light emissions induced by elastic deformation, plastic deformation and fracture of solids are called elastico ML (EML), plastico ML (PML) and fracto ML (FML), respectively. Whereas nearly 50% of all organic molecular solids and inorganic salts exhibit FML, only a few solids exhibit EML and PML. The EML and FML of certain solids are so intense that they can be seen during daylight with the naked eye. Mechanolumnescence has a great potential for use in different types of mechano-optical devices such as stress sensors, damage sensors, impact sensors, fracture sensors and safety management monitoring systems. This article reports a survey of the literature from 1605 to 2013. Mechanoluminescence is studied by physicists, chemists, material scientists, geologists, medical scientists, engineers and technologists, among others and researchers will certainly benefit from the literature survey on ML given here. In addition, the field of mechanoluminescence may attract the interest of many new researchers.

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“…8,9 In relation to the present study, laser-induced ML has already been reported for certain metals (Cu, Ag, Au, and so on). 10,11 However, it is worth noting that the present work is totally different from these studies in its implementation. For example, when studying the TL/ML emitted by a sizable metal disk in the studies mentioned above, the sample is irradiated directly by intense laser pulses (fluence ∼ 20 J/cm 2 ), and the TL/ML generated by the shock waves is detected from the reverse side of the disk.…”

Section: Introductionmentioning

confidence: 71%

Laser-Driven Shock Wave-Induced Triboluminescence of an Organic Crystal: Toward a Semiquantitative Study

2003

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A novel technique for studying triboluminescence (TL) of organic crystals is proposed. N-Isopropylcarbazole (NIPCz) crystals were fixed onto a glass plate, whose reverse side was coated with a black pigment that was used as a shock-generating layer. A single fundamental pulse from a Nd 3+ :YAG laser (1064 nm, fwhm ∼ 10 ns) was irradiated onto the shock-generating layer to generate a shock wave, and this resulted in both crystal fracture and TL from the NIPCz crystals. The TL spectrum was almost the same as the fluorescence spectrum of the NIPCz crystals. The dynamic behavior of the crystal fracture and the transient intensity of the TL were shown to be interrelated with each other. The generation of the TL commenced 200 ns after the laser exposure, and this was reproducible irrespective of the NIPCz samples, indicating that the generation and detection timings for TL are controllable with high accuracy by the present technique. In addition, the TL intensity increased with increasing amplitude of the shock wave, as well as the laser fluence. The results presented here demonstrate that the present method provides novel means of investigating TL phenomena semiquantitatively in a noncontact mode.

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Photon emission from metals under fast nondestructive loading

Cited by 6 publications

References 5 publications

Laser-Driven Acoustic Desorption of Organic Molecules from Back-Irradiated Solid Foils

Laser-Driven Acoustic Desorption of Organic Molecules from Back-Irradiated Solid Foils

Survey of the literature on mechanoluminescence from 1605 to 2013

Laser-Driven Shock Wave-Induced Triboluminescence of an Organic Crystal: Toward a Semiquantitative Study

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