61349-43-7

Upstream product

• 124-38-9 carbon dioxide 
• 7439-98-7 molybdenum 
• 7789-20-0 water-d2 
• 80937-33-3 oxygen 
• 10024-97-2 dinitrogen monoxide 
• 10102-43-9 nitrogen(II) oxide 

Relevant academic research and scientific papers

Electron beam induced transformation of MoO3 to MoO2 and a new phase MoO

The transformation of MoO3 induced by electron beam irradiation was studied by electron energy-loss spectroscopy (EELS) in combination with electron diffraction and high-resolution transmission electron microscopy (HRTEM) techniques. The routes of structure transformation were dependent on the applied electron current density. In case of low current density, MoO 2 was obtained. In case of high current density, MoO with a rock-salt structure is suggested to be the final phase. The change in oxidation states of the Mo oxides was deduced from the features in energy-loss near edge structure (ELNES) of the O K-edge. Quantitative analysis was successfully employed on Mo M3-edge and O K-edge to obtain the O/Mo ratio of the reduced phases. The mechanisms of different structure transformation behaviors were suggested in the frame of radiolysis enhanced diffusion.

Heavy water reactions with atomic transition-metal and main-group cations: Gas phase room-temperature kinetics and periodicities in reactivity

Reactions of heavy water, D2O, have been measured with 46 atomic metal cations at room temperature in a helium bath gas at 0.35 Torr using an inductively coupled plasma/selected ion flow tube tandem mass spectrometer. The atomic cations were produced at ca. 5500 K in an ICP source and were allowed to decay radiatively and thermalize by collisions with Ar and He atoms prior to reaction. Rate coefficients and product distributions are reported for the reactions of fourth-row atomic cations from K+ to Se+, of fifth-row atomic cations from Rb+ to Te+ (excluding Tc+), and of sixth-row atomic cations from Cs+ to Bi +. Primary reaction channels were observed leading to O-atom transfer, OD transfer, and D2O addition. O-Atom transfer occurs almost exclusively (≥90%) in the reactions with most early transition-metal cations (Sc+, Ti+, V+, Y+, Zr +, Nb+, Mo+, Hf+, Ta+, and W+) and to a minor extent (10%) with one main-group cation (As+). OD transfer is observed to occur only with three cations (Sr+, Ba+, and La+). Other cations, including most late transition and main-group cations, were observed to react with D 2O exclusively and slowly by D2O addition or not at all. O-Atom transfer proceeds with rate coefficients in the range of 8.1 × 10-13 (As+) to 9.5 × 10-10 (Y +) cm3 molecule-1 s-1 and with efficiencies below 0.1 and even below 0.01 for the fourth-row atomic cations V+ (0.0032) and As+ (0.0036). These low efficiencies can be understood in terms of the change in spin required to proceed from the reactant to the product potential energy surfaces. Higher order reactions are also measured. The primary products, NbO+, TaO+, MoO +, and WO+, are observed to react further with D 2O by O-atom transfer, and ZrO+ and HfO+ react further through OD group abstraction. Up to five D2O molecules were observed to add sequentially to selected M+ and MO+ as well as MO2+ cations and four to MO2D +. Equilibrium measurements for sequential D2O addition to M+ are also reported. The periodic variation in the efficiency (k/kc) of the first addition of D2O appears to be similar to the periodic variation in the standard free energy (ΔG°) of hydration.

Field emission from molybdenum carbide

The thermal stability and the resiliency of molybdenum carbide field-emission tips deposited at room temperature by electrophoresis have been studied. The field emission from Mo2C films deposited on Mo tips does not change after being heated to 800°C while exposed to 360 L of air, although MoO2, MoO3, and possibly MoO, are present in the films. The field-emission thresholds agree with photoelectric work functions determined from photoelectron spectroscopy measurements of similarly grown flat samples. These films are found to exist in three distinct phases as a function of temperature after formation by room-temperature electrophoresis. From room temperature to 500°C, MoO3 is the dominant oxide, from 500 to 775°C, MoC2 is the dominant oxide, and above 825°C both oxides have virtually disappeared.

Mass-spectrometric study of evaporation and thermodynamic properties of silica: III.1 Equilibrium reactions of molecules occurring in the gas phase over silica

The reactions of SiO, SiO2, and Si2O2 molecules occurring in the gas phase over silica at 1610-1980 K were studied by the Knudsen mass-spectrometric effusion procedure. The results were compared with published data.

Activation of CO2 by laser-ablated group 6 metal atoms

The primary reaction products of laser-ablated group 6 atoms with CO2 prove to be the insertion products OMCO and O2M(CO)2 (M = Cr, Mo, W) which are isolated in argon matrices and identified by the effects of isotopic subs

Investigation of Cr and Mo atoms in shock waves

Using the shock wave technique, the authors measured the reaction rate constants of Cr and Mo atoms in the temperature range ≈ 1000- 3000°K with the following oxidants: NO, NO2, N2O, and SO2. The bond strengths of CrO and MoO molecules were assessed.

Mechanism and kinetics of interaction of Fe, Cr, Mo, and Mn atoms with molecular oxygen

By means of resonance atomic absorption in shock waves, rate constants have been measured for the interaction of atoms of a number of transition metals (Fe, Cr, Mo, and Mn) with molecular oxygen. A new method is proposed and used for determining the exponent γ in the modified Lambert-Beer law. The bond strength in the CrO and MoO molecules has been estimated.