Sachinkumar Dagurao Pangavhane

Masaryk University, Brünn, South Moravian, Czech Republic

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Publications (5)12.62 Total impact

  • Source
    Sachinkumar Dagurao Pangavhane, Petr Němec, Virginie Nazabal, Alain Moreac, Pál Jóvári, Josef Havel
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    ABSTRACT: RATIONALERare earth-doped sulphide glasses in the Ga-Ge-Sb-S system present radiative emissions from the visible to the middle infrared range (mid-IR) range, which are of interest for a variety of applications including (bio)-chemical optical sensing, light detection, and military counter-measures. The aim of this work was to reveal structural motifs present during the fabrication of thin films by plasma deposition techniques as such knowledge is important for the optimization of thin film growth.METHODS The formation of clusters in plasma plume from different concentrations of erbium-doped Ga5Ge20Sb10S65 glasses (0.05, 0.1, and 0.5 wt. % of erbium) using laser (337 nm) desorption ionization (LDI) was studied by time-of-flight mass spectrometry (TOF MS) in both positive and negative ion mode. The stoichiometry of the GamGenSboSp+/– clusters was determined via isotopic envelope analysis and computer modelling.RESULTSSeveral GamGenSboSp+/– singly charged clusters were found but, surprisingly, only four species (Sb3S4+/–, GaSb2Sp+/– (p = 4, 5), Ga3Sb2S7+/–) were common to both ion modes. For the first time, species containing rare earths (GaSb2SEr+ and GaS6Er2+) were identified in the plasma formed from rare earth-doped chalcogenide glasses, directly confirming the importance of gallium presence for rare earth bonding within the glassy matrix.CONCLUSIONS The local structure of Ga-Ge-Sb-S glasses is at least partly different from the structure of species identified in plasma by mass spectrometry, as deduced from Raman scattering spectroscopy analysis; these glasses are mainly formed by [GeS4/2]/[GaS4/2] tetrahedra and [SbS3/2] pyramids. Extended X-ray absorption fine structure measurements show that Er3+ ions in Ga-Ge-Sb-S glasses are surrounded by 7 sulphur atoms. Copyright © 2014 John Wiley & Sons, Ltd.
    Rapid Communications in Mass Spectrometry 06/2014; 28(11). DOI:10.1002/rcm.6896 · 2.64 Impact Factor
  • Sachinkumar Dagurao Pangavhane, Lucie Hebedová, Milan Alberti, Josef Havel
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    ABSTRACT: Phosphorus nitride clusters generated during Laser Desorption Ionization (LDI) and Matrix-Assisted Laser Desorption Ionization (MALDI) of solid P(3) N(5) were analyzed via Time-of-Flight Mass Spectrometry (TOF MS). The LDI TOF mass spectra show the formation of series of clusters: P(m)N(n)(+) {(m=1; n=8-11), (m=4; n=3-4), (m=5; n=1-5), (m=6; n=1-3, 5-8), (m=2-7; n=1), (m=5-10; n=2), (m=4-6; n=3), (m=4,5; n=4), (m=5,6; n=5)}, and P(m)N(n)(-) (m=4,5; n=1). Using 3-hydroxypicolinic acid (HPA) as a matrix the P(m)N(n)(+) species (m=1-4, 6, 8) with a high nitrogen content (n=4, 5, 8, 10-12, 20) were identified. The formation of a N(6)(-) cluster was also detected using a C(60) matrix. Under various conditions singly charged P(m)(+) (m=2-7, 9, 13), P(m)(-) (m=3-11, 13, 15, 17), N(n)(+) (n=5, 9, 10, 12, 13), and N(n)(-) (n=6, 10-15) clusters were identified in the mass spectra. Such high nitrogen content clusters (up to N(15)(-)) generated by laser desorption from a solid material are described for the first time. The stoichiometry of the P(m)N(n) clusters was determined via isotopic envelope analysis and computer modelling. The composition of the clusters with respect to the crystalline structure of α-P(3)N(5) is discussed.
    Rapid Communications in Mass Spectrometry 04/2011; 25(7):917-24. DOI:10.1002/rcm.4937 · 2.64 Impact Factor
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    Sachinkumar Dagurao Pangavhane, Petr Nemec, Tomás Wagner, Jan Janca, Josef Havel
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    ABSTRACT: Binary chalcogenide As-Se glasses and their thin films are important for optics, computers, materials science and technological applications. To increase understanding of the properties of thin films fabricated by plasma deposition techniques, more information concerning the physics of plasma plume is needed. In this study the formation of clusters in plasma plume from different As-Se glasses by laser desorption ionization (LDI) or laser ablation (LA) was studied by time-of-flight mass spectrometry (TOF MS) in positive and negative ion modes. Formation of a number of As(p)Se(q) singly charged clusters As(3)Se(q)(+) (q = 1-5), AsSe(q)(-) (q = 1-3), As(2)Se(q)(-) (q = 2-4), and As(3)Se(q)(-) (q = 2-5) was found from As-Se glasses with the molar ratio As:Se in the range from 1:2 to 7:3. The stoichiometry of the As(p)Se(q) clusters was determined via isotopic envelope analysis and computer modeling. The structure of the clusters is proposed and the relationship to the structure of the parent glasses, as also suggested by Raman scattering spectra, is discussed.
    Rapid Communications in Mass Spectrometry 07/2010; 24(14):2000-8. DOI:10.1002/rcm.4607 · 2.64 Impact Factor
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    ABSTRACT: Extensive quantum chemistry (QC) modeling of new arsenic sulfides identified by TOF-MS was performed using Hartree–Fock and density functional calculations with the 6-311G∗ basis set and electronic energies as well as geometries of positively singly-charged mono-arsenic sulfide clusters were determined. It was found that the cyclic and bi-cyclic structures of AsSn+ (n = 1–7) clusters are more stable than open structures although all are hetero-cyclic. Also the structure of AsS7 is not the expected single ring AsS7 as analogous to the S8 molecule but it posses a double ring structure with arsenic atom three coordinated.
    Polyhedron 04/2010; 29(6):1567–1574. DOI:10.1016/j.poly.2010.02.012 · 2.05 Impact Factor
  • Sachinkumar Dagurao Pangavhane, Jan Houska, Tomás Wágner, Martin Pavlista, Jan Janca, Josef Havel
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    ABSTRACT: Ternary chalcogenide As-S-Se glasses, important for optics, computers, material science and technological applications, are often made by pulsed laser deposition (PLD) technology but the plasma composition formed during the process is mostly unknown. Therefore, the formation of clusters in a plasma plume from different glasses was followed by laser desorption ionization (LDI) or laser ablation (LA) time-of-flight mass spectrometry (TOF MS) in positive and negative ion modes. The LA of glasses of different composition leads to the formation of a number of binary As(p)S(q), As(p)Se(r) and ternary As(p)S(q)Se(r) singly charged clusters. Series of clusters with the ratio As:chalcogen = 3:3 (As(3)S(3)(+), As(3)S(2)Se(+), As(3)SSe(2)(+)), 3:4 (As(3)S(4)(+), As(3)S(3)Se(+), As(3)S(2)Se(2)(+), As(3)SSe(3)(+), As(3)Se(4)(+)), 3:1 (As(3)S(+), As(3)Se(+)), and 3:2 (As(3)S(2)(+), As(3)SSe(+), As(3)Se(2)(+)), formed from both bulk and PLD-deposited nano-layer glass, were detected. The stoichiometry of the As(p)S(q)Se(r) clusters was determined via isotopic envelope analysis and computer modeling. The structure of the clusters is discussed.
    Rapid Communications in Mass Spectrometry 12/2009; 24(1):95-102. DOI:10.1002/rcm.4362 · 2.64 Impact Factor

Publication Stats

39 Citations
12.62 Total Impact Points

Institutions

  • 2009–2014
    • Masaryk University
      • Department of Chemistry
      Brünn, South Moravian, Czech Republic