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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on HgBr2 by Materials Project

HgBr2 crystallizes in the orthorhombic Cmc2_1 space group. The structure is two-dimensional and consists of two HgBr2 sheets oriented in the (0, 0, 1) direction. Hg2+ is bonded to six Br1- atoms to form distorted edge-sharing HgBr6 octahedra. There are a spread of Hg–Br bond distances ranging from 2.48–3.42 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to three equivalent Hg2+ atoms. In the second Br1- site, Br1- is bonded in a 1-coordinate geometry to three equivalent Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgBr2 by Materials Project

HgBr2 is trigonal omega-like structured and crystallizes in the trigonal P3 space group. The structure is two-dimensional and consists of one HgBr2 sheet oriented in the (0, 0, 1) direction. there are three inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to six Br1- atoms to form edge-sharing HgBr6 octahedra. There are three shorter (2.81 Å) and three longer (2.94 Å) Hg–Br bond lengths. In the second Hg2+ site, Hg2+ is bonded to six Br1- atoms to form edge-sharing HgBr6 octahedra. There are three shorter (2.86 Å) and three longer (2.89 Å) Hg–Br bond lengths. In the third Hg2+ site, Hg2+ is bonded to six Br1- atoms to form edge-sharing HgBr6 octahedra. There are three shorter (2.82 Å) and three longer (2.93 Å) Hg–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted T-shaped geometry to three Hg2+ atoms. In the second Br1- site, Br1- is bonded in a distorted T-shaped geometry to three Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgC2Br3N by Materials Project

HgBr2C2NBr crystallizes in the monoclinic P2/c space group. The structure is zero-dimensional and consists of two mercuric bromide molecules, eight C2NBr clusters, and two HgBr2 clusters. In each C2NBr cluster, there are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a water-like geometry to one N3- and one Br1- atom. The C–N bond length is 1.33 Å. The C–Br bond length is 1.90 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.21 Å. N3- is bonded in a linear geometry to two C2+ atoms. Br1- is bonded in a single-bond geometry to one C2+ atom. In each HgBr2 cluster, there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to three Br1- atoms. There are a spread of Hg–Br bond distances ranging from 2.45–3.35 Å. In the second Hg2+ site, Hg2+ is bonded in a linear geometry to two equivalent Br1- atoms. Both Hg–Br bond lengths are 2.45 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted bent 120 degrees geometry to two Hg2+ atoms. In the second Br1- site, Br1- is bonded in a single-bond geometry to one Hg2+ atom. In the third Br1- site, Br1- is bonded in a single-bond geometry to one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2IBr3 by Materials Project

Hg2Br3I crystallizes in the monoclinic Cm space group. The structure is two-dimensional and consists of one HgBr2 sheet oriented in the (0, 0, 1) direction and one HgBrI sheet oriented in the (0, 0, 1) direction. In the HgBr2 sheet, Hg2+ is bonded in a distorted linear geometry to six Br1- atoms. There are a spread of Hg–Br bond distances ranging from 2.46–3.58 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted single-bond geometry to three equivalent Hg2+ atoms. In the second Br1- site, Br1- is bonded in a distorted single-bond geometry to three equivalent Hg2+ atoms. In the HgBrI sheet, Hg2+ is bonded to three equivalent I1- and three equivalent Br1- atoms to form distorted edge-sharing HgI3Br3 octahedra. There are one shorter (2.64 Å) and two longer (3.54 Å) Hg–I bond lengths. There are one shorter (2.49 Å) and two longer (3.54 Å) Hg–Br bond lengths. I1- is bonded in a 1-coordinate geometry to three equivalent Hg2+ atoms. Br1- is bonded in a distorted single-bond geometry to three equivalent Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3As8(S4Br3)2 by Materials Project

(HgBr2)2HgAs8(S4Br)2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four mercuric bromide molecules and two HgAs8(S4Br)2 clusters. In each HgAs8(S4Br)2 cluster, Hg2+ is bonded in a distorted linear geometry to four S2- and two equivalent Br1- atoms. There are two shorter (3.29 Å) and two longer (3.35 Å) Hg–S bond lengths. Both Hg–Br bond lengths are 2.50 Å. There are four inequivalent As2+ sites. In the first As2+ site, As2+ is bonded in an L-shaped geometry to two S2- atoms. Both As–S bond lengths are 2.27 Å. In the second As2+ site, As2+ is bonded in an L-shaped geometry to two S2- atoms. Both As–S bond lengths are 2.26 Å. In the third As2+ site, As2+ is bonded in an L-shaped geometry to two S2- atoms. Both As–S bond lengths are 2.26 Å. In the fourth As2+ site, As2+ is bonded in an L-shaped geometry to two S2- atoms. There are one shorter (2.26 Å) and one longer (2.28 Å) As–S bond lengths. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 2-coordinate geometry to two As2+ atoms. In the second S2- site, S2- is bonded in a distorted water-like geometry to two As2+ atoms. In the third S2- site, S2- is bonded in a distorted water-like geometry to one Hg2+ and two As2+ atoms. In the fourth S2- site, S2- is bonded in a distorted water-like geometry to one Hg2+ and two As2+ atoms. Br1- is bonded in a single-bond geometry to one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgH4C4(Br2N)2 by Materials Project

HgBr2(HC2N)2(HBr)2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of eight aziridine molecules, eight hydrobromic acid molecules, and four mercuric bromide molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgC2(Br2N)2 by Materials Project

HgBr2(BrCN)2 is Cyanogen Chloride-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of eight cyanogen bromide molecules and four mercuric bromide molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2SBr4N2O3 by Materials Project

(HgBr2)2N2SO3 crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of four ammonia molecules, four mercuric bromide molecules, and two sulfur trioxide molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Brewster angle-cavity ringdown spectroscopy for low temperature plasma measurements in multiphases

Here we report on the development of a Brewster angle-cavity ringdown spectroscopy (BA-CRDS) system for low temperature plasma diagnostics. The system can measure gas species in solutions, with a detection limit (minimum detectable absorbance) of 9.1 × 10 -5 , which is equivalent to a detection limit of 0.04 parts per billion for measuring OH radicals in water at 308 nm. With higher reflectivity ringdown mirrors and improved design of a Brewster angle cell, the detection limit can potentially be up to 10 -6 or lower. In this exploratory study, the absorption cross sections of HgBr 2 and H 2 O 2 in the aqueous phase at 256 nm are measured to be (1.8 ± 0.1) × 10 -18 cm 2 and (5.2 ± 0.5) × 10 -20 cm 2 , respectively. Furthermore, temporal profiles of absorbance from distilled water, HgBr 2 , and H 2 O 2 solutions when interacting with a helium atmospheric plasma jet are individually characterized at different plasma powers, gas flow rates, and/or solute concentrations. The observed linear temporal profiles of absorbance from the plasma-interacted water suggest formation of H 2 O 2 from plasma-generated OH radicals, while the nonlinear temporal profiles from the plasma-treated HgBr 2 solutions reveal possible removal of HgBr 2 by OH radicals. Our results demonstrate that the new BA-CRDS system is a powerful tool for quantification of reactive plasma species in multiphases or other complex settings.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗