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Tuesday, May 12, 2020 | History

2 edition of SWIR and visible atomic emmission from laser-produced oxygen and nitrogen plasmas found in the catalog.

SWIR and visible atomic emmission from laser-produced oxygen and nitrogen plasmas

Jonathan B Lurie

SWIR and visible atomic emmission from laser-produced oxygen and nitrogen plasmas

by Jonathan B Lurie

  • 263 Want to read
  • 27 Currently reading

Published by Infrared Technology Division, Air Force Geophysics Laboratory in Hanscom, AFB, MA .
Written in English

    Subjects:
  • Infrared sources,
  • Plasma (Ionized gases)

  • Edition Notes

    StatementJonathan B. Lurie, Steven M. Miller, Russell A. Armstrong
    SeriesAFGL-TR -- 84-0161, Environmental research papers -- no. 882, Environmental research papers (Hanscom AFB, Mass.) -- no. 882
    ContributionsMiller, Steven M., 1952-, Armstrong, R. A, U.S. Air Force Geophysics Laboratory. Infrared Technology Division
    The Physical Object
    Pagination19 p. :
    Number of Pages19
    ID Numbers
    Open LibraryOL14860961M

    The emission characteristics of laser-induced plasma, with the use of a Q-switched ruby laser of J, were studied in argon atmosphere at reduced pressure. The time- and spatially resolved emission profiles were measured. In argon atmosphere at reduced pressure, the emission period of plasma is elongated to over a hundred microseconds, and the emissive region expands to more than a few tens. Uranium, because of its pyrophoricity, oxidizes rapidly in an oxygen-containing high-temperature environment. However, so far, the identification of uranium oxide (UO) emission from a laser-produced plasma system is limited to a spectral feature around nm. The aim of this study is to elucidate UO emission features in the visible spectral regime from uranium plasmas generated in an Cited by: 8.

    Other diatomic species, whose emission bands also appear in the visible and near-ultraviolet regions of the LIBS spectrum, remain virtually unexplored. This research focuses, for the first time, on elucidating the formation pathways of CH, NH, and OH radicals in femtosecond laser-produced plasmas of molecular by: Hydrogen and deuterium (D 2 enrichment of 99%, nitrogen-impurity level of ~%, and oxygen ~%) were passed through silica gel and active copper for purification. The emission spectra were analysed by means of an SPM-2 monochromator with a quartz prism and an FEU photomultiplier operating in photon-counting by: 1.

      Although most of the studies and applications of LIP emission spectroscopy concern the atomic optical emission, molecular features have attracted increasing interest in the diagnostics of laser-produced plasmas during recent years. The early studies were mainly dedicated to the understanding of chemical processes in thin film synthesis via by: Abstract. The results of investigation of ion emission from picosecond laser-produced plasmas of various atomic number are presented. The emission of Ta 38+, AU 33+ as well as A1 13+ ions is demonstrated. Some characteristics of the picosecond plasma are also : Jan Badziak, J. Makowski, P. Parys, J. Wolowski, E. Woryna, A.B. Vankov.


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SWIR and visible atomic emmission from laser-produced oxygen and nitrogen plasmas by Jonathan B Lurie Download PDF EPUB FB2

Get this from a library. SWIR and visible atomic emission from laser-produced oxygen and nitrogen plasmas. [Jonathan B Lurie; Steven M Miller; R A Armstrong; U.S. Air Force Geophysics Laboratory. Infrared Technology Division.] -- We report the first observations of structured infrared emission from atomic Rydberg states produced by three-body recombination of laser-produced oxygen and nitrogen.

Rydberg states produced by three-body recombination of laser-produced oxygen and nitrogen plasmas. Emission is observed in the 2. 00 to p~ spectral region through the use of a simple grating monochromator.

In addition, we discuss time-resolved visible emission studies that provide temporal information on the atomic infrared-emitting states.

Implications are considered for the. USA Received 4 April to final form 19 July We repon the first observations of infrared line emission from high-(Sing oxygen atom states produced to a laser-generated oxygen plasma Time-resolved visible emission studies provide information on the temporal behavior of the atomic infraredemitting states The relative populations of the observed O-atom n = 4 states are discu~scd in Cited by: 3.

We report the first observations of structured infrared emission from atomic Rydberg states produced by three-body recombination of laser-produced oxygen and nitrogen plasmas. Request PDF | Emission Study of alumina Plasma Produced by a KrF laser | We report on the plasma emission formed from an α-alumina target when irradiated by laser into vacuum and through oxygen.

The aim of this study is to elucidate UO emission features in the visible spectral regime from uranium plasmas generated in an environment with varying oxygen concentrations.

resolution LIB emission spectrum (– Å) in oxygen at a pressure of kPa, excited by the 10P(20) line of the CO 2 laser, and assignment of the atomic lines of O, O +,O.

Laser-produced nitrogen plasmas emitting radiation at nm (Ly-a) and nm (He-a) are considered potential efficient sources for water-window (WW) microscopy. In addition, the effect of the plasma discharge generated using pure argon (Ar) as opposed to pure nitrogen (N 2) is discussed.

The emission from the plasma is acquired using a broadband optical emission spectrometer (OES). In the case of pure nitrogen plasmas, the intensities of the atomic emission lines are depleted after W of RF by: 2.

Radiation in the visible spectral range originates from atomic and molecular electronic transitions. Thus, the heavy particles of low temperature plasmas, the neutrals and their ions basically characterize the colour of a plasma: typically a helium plasma is pink, neon plasmas are red, nitrogen plasmasFile Size: KB.

Introduction Lurie, Miller and Armstrong [1] recently observed 0-atom infrared emission lines in the p.m re- gion in a laser-produced oxygen plasma. These oxygen atom shortwavelength infrared (SWIR) transitions originate in n = 4 states, which lie more than cm-1 below the ionization limit at cmCited by: 4.

the density of atomic nitrogen in such air plasma can be used, when coupled with previously obtained atomic oxygen densities[1] [2], for validation of a complex hydro-kinetics model involving transport and plasma chemistry.

As is known, the classical optical emission spectroscopy (OES) can give directFile Size: 3MB. Gas mixtures that include oxygen and nitrogen, in particular those using an air-like ratio ofare especially important for applications requiring the production of reactive oxygen and nitrogen species in ambient air, for example biomedical technologies.

Atomic oxygen and nitrogen have been shown to. Fig. 2a–c shows a comparison between the emission spectra in the range of to nm obtained in the SP and DP three spectra were acquired at Δx = 6 mm using a gate delay and a gate width of ns and ns 2a and c shows the spectra obtained from the individual plasmas of Cu and C respectively and Fig.

2b corresponds to the emission of the colliding Cited by: Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma J Dedrick1,*, S Schr oter 1, K Niemi1, A Wijaikhum, E Wagenaars, N de Oliveira 2, L Nahon, J P Booth3, D O’Connell1, and T Gans1 1York Plasma Institute, Department of Physics, University of York, Heslington YO10 5DD, York, UK.

The wavelength region between the K-edges of carbon and oxygen is termed as the water window (λ = – nm) and is considered to be suitable for the observation of nanometer-scale structures composed of light elements in an aqueous solution because of both the short wavelength and transparency of the nanometer-scale structures in an aqueous solution fluctuate owing to Cited by: 2.

Optical emission studies of nitrogen plasma generated by IR CO 2 laser pulses Figure 1. Schematic diagram of the experimental set-up for laser-induced breakdown. J File Size: KB. Laser-heated gas breakdown plasmas or sparks emit profoundly in the ultraviolet and visible region of the electromagnetic spectrum with contributions from ionic, atomic, and molecular species.

Laser created kernels expand into a cold ambient with high velocities during their early lifetime followed by confinement of the plasma kernel and eventually by: 9.

Emission study of alumina plasma produced by a KrF laser. In fact the coupling of the plasma with the laser is more efficient in infrared and visible than in ultraviolet due to the Bremsstrahlung inverse absorption process. BriandIsotope ratio determination of uranium by optical emission spectroscopy on a laser-produced plasma Cited by: 5.

Optical emission spectroscopy of oxygen plasma induced by IR CO2 pulsed laser J J Camacho, M Santos, L Díaz et al.-Optical emission studies of the mercury plasma generated by a Nd: YAG laser Nek M Shaikh, S Hafeez, B Rashid et al.-Influence of the laser pulse duration on plasma properties B Le Drogoff, J Margot, F Vidal et al.-Recent citationsCited by:.

The emission spectra just outside the jet nozzle (0 mm) are shown in Fig. 3. A spectrum similar to that inside the jet nozzle was obtained. However, there is a characteristic difference in that emissions from atomic nitrogen were observed.

This fact suggests that atomic nitrogen is generated and excited near the exit of the jet nozzle.Download figure: Standard Export PowerPoint slide The emission spectroscopy measurements were made with a m Czerny-Turner monochromator blazed at nm with a grating of groove mm − plasma light was collected in a direction orthogonal to the laser beam by a bi-convex lens with a focal length of mm and imaged onto the entrance slit by a bi-convex lens with a focal length of.

Reactive atomic species play a key role in emerging cold atmospheric pressure plasma applications, in particular, in plasma medicine. Absolute densities of atomic oxygen and atomic nitrogen were measured in a radio-frequency driven non-equilibrium plasma operated at atmospheric pressure using vacuum ultra-violet (VUV) absorption by: