You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
3 May 2016Effectiveness of laser sources for contactless sampling of explosives
A mass-spectrometric study of photo processes initiated by ultraviolet (UV) laser radiation in explosives adsorbed on
metal and dielectric substrates has been performed. A calibrated quadrupole mass spectrometer was used to determine a
value of activation energy of desorption and a quantity of explosives desorbed by laser radiation. A special vacuumoptical
module was elaborated and integrated into a vacuum mass-spectrometric system to focus the laser beam on a
sample.
It has been shown that the action of nanosecond laser radiation set at q= 107 - 108 W/cm2, λ=266 nm on adsorbed layers
of molecules of trinitrotoluene (TNT ) and pentaerytritoltetranitrate (PETN) leads not only to an effective desorption,
but also to the non-equilibrium dissociation of molecules with the formation of nitrogen oxide NO. The cyclotrimethylenetrinitramine
(RDX) dissociation products are observed only at high laser intensities (q> 109 W/cm2) thus indicating
the thermal nature of dissociation, whereas desorption of RDX is observed even at q> 107 W/cm2 from all substrates.
Desorption is not observed for cyclotetramethylenetetranitramine (HMX) under single pulse action: the dissociation
products NO and NO2 are registered only, whereas irradiation at 10Hz is quite effective for HMX desorption. The
results clearly demonstrate a high efficiency of nanosecond laser radiation with λ = 266 nm, q ~ 107 - 108 W/cm2, Epulse=
1mJ for desorption of molecules of explosives from various surfaces.
The alert did not successfully save. Please try again later.
Artem E. Akmalov, Alexander A. Chistyakov, Gennadii E. Kotkovskii, "Effectiveness of laser sources for contactless sampling of explosives," Proc. SPIE 9823, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXI, 982311 (3 May 2016); https://doi.org/10.1117/12.2222188