Laser ablation generation of arsenic and arsenic sulfide clusters

Špalt, Zbyněk; Alberti, Milan; Peña‐Méndez, Eladia María; Havel, Josef

doi:10.1016/j.poly.2005.03.089

Cited by 34 publications

(24 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clusters up to As 7 have been produced by laser ablation as well. [25] Here we study the allotropy of arsenic by quantum chemical methods. Two classes of allotropic nanostructures, icosahedral cages and ring-shaped chains, are derived from structural motifs previously applied for phosphorus.…”

Section: Introductionmentioning

confidence: 99%

Icosahedral and Ring‐Shaped Allotropes of Arsenic

2007

View full text Add to dashboard Cite

We predict the existence of two novel families of arsenic nanostructures: icosahedral cages and ring-shaped chains. Quantum chemical calculations on the cages, rings, and the experimentally known allotropes of arsenic suggest the nanostructures to be thermodynamically stable. The icosahedral cages are modifications of the gray allotrope of arsenic, while the ring-shaped chains are structurally related to the red allotrope of phosphorus. Comparisons between the analogous allotropes of arsenic and phosphorus show distinct differences. While phosphorus favors the ring-shaped chains over the icosahedral cages, large cages become favorable for arsenic. From the thermodynamical point of view, experimental preparation of the proposed families of arsenic nanostructures is expected to be viable.

show abstract

Section: Introductionmentioning

confidence: 99%

Icosahedral and Ring‐Shaped Allotropes of Arsenic

2007

View full text Add to dashboard Cite

show abstract

“…Recently, we have successfully applied laser ablation (LA) and/or laser desorption/ionisation (LDI) to various systems, e.g. to the synthesis and identification of several new tellurium, sulfur, and tellurium‐sulfur clusters,11 phosphorus and phosphorus‐sulfur clusters,12 selenium sulfides,13 and arsenic and/or arsenic sulfide clusters,14 etc. Also, in order to enable analysis of aggressive compounds, we introduced the application of graphite microcrucibles as inert platforms for matrix‐assisted laser desorption/ionisation time‐of‐flight mass spectrometry (MALDI‐TOF‐MS),15 and demonstrated that MS analysis of highly aggressive compounds and/or liquids like concentrated sulfuric or selenic acid is possible 16…”

mentioning

confidence: 99%

Laser ablation synthesis of selenium superoxide anion SeO via selenium trioxide photolysis. Time‐of‐flight mass spectrometry and ab initio calculations

Alberti

Špalt

Peña‐Méndez

et al. 2005

Rapid Comm Mass Spectrometry

Self Cite

View full text Add to dashboard Cite

Laser desorption/ionisation and laser ablation of solid selenium trioxide, as well as the gas-phase behaviour of selenium trioxide, were studied. Selenium trioxide undergoes photochemical decomposition and, from the mass spectra obtained by laser desorption/ionisation time-of-flight mass spectrometry (LDI-TOF-MS), the following species were identified: O-, O2-, O3-, SeO-, SeO2-, SeO3-, SeO4-, Se2O7-, Se3O11-, and Se4O14-. Formation of the selenium superoxide SeO4- anion is described in this work for the first time. In addition, low-abundance selenium species such as Se2O8H2-, Se3O11H-, and Se4O15H2- were also detected. The stoichiometry of all ions was confirmed via isotopic pattern modeling and/or post-source decay (PSD) analysis. Photolysis of selenium trioxide leads partly to ozone formation. It was found that the most likely mechanisms of selenium superoxide formation are oxidation of selenium trioxide with ozone and/or reactive oxygen radicals, or photolysis of selenium trioxide tetramer (SeO3)4. Therefore, ab initio calculations were performed to support the mass spectrometric evidence and to suggest probable geometries for selenium superoxide anion SeO4- and diselenium superoxide anion Se2O7-, as well as to provide insight into and/or predict possible formation pathways. It has been found that both cyclic and non-cyclic peroxide structures of SeO4- and Se2O7- ions are possible. In addition, the SeO4 structure was also calculated guided by thermodynamic considerations using Gaussian-2 methodology, and the inferred stability of the SeO4 neutral molecule was supported by ab initio calculations.

show abstract

“…Only AsS + ions were detected and not higher AsS

_{italicn}^{+}

( n = 2–7). On the contrary, these higher ions were detected by Spalta et al 26 who studied thin As 2 S 3 films obtained by PLD. In a later paper 27, the structures of AsS

_{italicn}^{+}

monoarsenic sulfides were calculated using Hartree–Fock and DTF theories.…”

Section: Discussionmentioning

confidence: 79%

High‐contrast 2D etched holes array obtained by direct laser writing on chalcogenide As₂S₃ films

Popescu

Săvăstru

Savastru

et al. 2012

Physica Status Solidi (a)

View full text Add to dashboard Cite

This paper studies optical, chemical and photoinduced changes in amorphous AsS films, obtained by nanosecond pulsed‐laser ablation of a As40S60 target. The arsenic content of the films is slightly higher than the target composition and depends on the ablation fluence. The photobleaching phenomenon appears after 1–2 min of bandgap laser irradiation. The refractive index diminishes by 0.07 and the transmission approximately doubles. It was established for the first time that films obtained by pulsed laser deposition exhibit a positive resist behavior in amine‐containing etchant. The etching rate of the irradiated film was 0.12 µm/min, while as‐deposited films have lower etching rate. The measured selectivity rate was of 14:1. A 2D high‐quality hole array was produced by direct laser writing and further etching. The unusual behavior can be a result of different glass network formation during the condensation of AsSn molecules sputtered from the bulk target. This is different from the case of thermally evaporated films where AsS1 molecules only were identified in gas‐phase by mass spectrometry.

show abstract

Laser ablation generation of arsenic and arsenic sulfide clusters

Cited by 34 publications

References 21 publications

Icosahedral and Ring‐Shaped Allotropes of Arsenic

Icosahedral and Ring‐Shaped Allotropes of Arsenic

Laser ablation synthesis of selenium superoxide anion SeO via selenium trioxide photolysis. Time‐of‐flight mass spectrometry and ab initio calculations

High‐contrast 2D etched holes array obtained by direct laser writing on chalcogenide As₂S₃ films

Contact Info

Product

Resources

About

Laser ablation generation of arsenic and arsenic sulfide clusters

Cited by 34 publications

References 21 publications

Icosahedral and Ring‐Shaped Allotropes of Arsenic

Icosahedral and Ring‐Shaped Allotropes of Arsenic

Laser ablation synthesis of selenium superoxide anion SeO via selenium trioxide photolysis. Time‐of‐flight mass spectrometry and ab initio calculations

High‐contrast 2D etched holes array obtained by direct laser writing on chalcogenide As2S3 films

Contact Info

Product

Resources

About

High‐contrast 2D etched holes array obtained by direct laser writing on chalcogenide As₂S₃ films