Gas-phase reaction of tungsten dimer with NH3 and C2H4 at room temperature

Ishikawa, Yoichi; Matsumoto, Yoshitaka

doi:10.1016/s0009-2614(01)01445-2

Chemical Physics Letters

2002

DOI: 10.1016/s0009-2614(01)01445-2

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Gas-phase reaction of tungsten dimer with NH3 and C2H4 at room temperature

Yoichi Ishikawa¹,

Yoshitaka Matsumoto²

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Cited by 3 publications

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“…Under the conditions for a discharge in a liquid, carbides are formed during a few milliseconds as a result of gas-phase reactions. For example, we know that tungsten dimers react with C 2 H 4 even at room temperature, and so reactions of carbide formation can occur over the entire discharge zone [46]. The temperature in the discharge zone between zinc electrodes is no higher than 900 o C (the boiling point of zinc is 907 o C).…”

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Synthesis of nanoparticles using a pulsed electrical discharge in a liquid

et al. 2008

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We used a pulsed electrical discharge in a liquid to obtain Cu-, WC-, and ZnO-containing nanoparticles. The effect of the discharge current and pulse duration on the morphology and phase composition of the synthesized material was studied by spectrophotometry, transmission electron microscopy, and x-ray diffraction analysis. We discuss possible mechanisms for nanoparticle formation in a discharge submerged in a liquid.

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Synthesis of nanoparticles using a pulsed electrical discharge in a liquid

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The bond length and bond energy of gaseous CrW

Matthew

Sevy

et al. 2016

The Journal of Chemical Physics

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Supersonically cooled CrW was studied using resonant two-photon ionization spectroscopy. The vibronically resolved spectrum was recorded over the region 21 100 to 23 400 cm(-1), showing a very large number of bands. Seventeen of these bands, across three different isotopologues, were rotationally resolved and analyzed. All were found to arise from the ground (1)Σ(+) state of the molecule and to terminate on states with Ω' = 0. The average r0 bond length across the three isotopic forms was determined to be 1.8814(4) Å. A predissociation threshold was observed in this dense manifold of vibronic states at 23 127(10) cm(-1), indicating a bond dissociation energy of D0(CrW) = 2.867(1) eV. Using the multiple bonding radius determined for atomic Cr in previous work, the multiple bonding radius for tungsten was calculated to be 1.037 Å. Comparisons are made between CrW and the previously investigated group 6 diatomic metals, Cr2, CrMo, and Mo2, and to previous computational studies of this molecule. It is also found that the accurately known bond dissociation energies of group 5/6 metal diatomics Cr2, V2, CrW, NbCr, VNb, Mo2, and Nb2 display a qualitative linear dependence on the sum of the d-orbital radial expectation values, r; this relationship allows the bond dissociation energies of other molecules of this type to be estimated.

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Kinetic Study of Tungsten Atoms (a 7S3 and a 5DJ) in the Presence of C2H4 and NH3 at Room Temperature

Ishikawa¹,

Matsumoto²

2003

Bulletin of the Chemical Society of Japan

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The gas-phase reactivity of W (a 7S3 and a 5DJ) with C2H4 and NH3 at room temperature was investigated using a time-resolved laser induced fluorescence (LIF) spectroscopy. Tungsten atoms were produced by a 266-nm multiphoton decomposition (MPD) of W(CO)6. The reactant pressure dependence of the pseudo-first-order depletion rates of W (a 7S3) could allow an estimation of the pseudo-second-order depletion rate constant of W (a 7S3), (4.5 ± 0.5) × 10−10 cm3 molecule−1 s−1 for C2H4 and (0.73 ± 0.10) × 10−10 for NH3 at 6.0-Torr total pressure with an Ar buffer. A simulation of the transient curves based on a modification of the observed apparent decay rate constants, involving nearby a 5DJ states in the presence of C2H4 and NH3, allowed us to separately estimate the contribution of the chemical quenching (W (a 7S3) + R → product(s)) and the physical quenching (W (a 7S3) + R → W (a 5D1) + R) processes. In the case of C2H4, chemical quenching appeared to dominate over the physical quenching, while the physical quenching was the main depletion process in the case of NH3. The large reactivity of the W (a 7S3) state not only for C2H4, but also for NH3, is discussed in terms of the relativistic effects.

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Gas-phase reaction of tungsten dimer with NH3 and C2H4 at room temperature

Cited by 3 publications

References 7 publications

Synthesis of nanoparticles using a pulsed electrical discharge in a liquid

Synthesis of nanoparticles using a pulsed electrical discharge in a liquid

The bond length and bond energy of gaseous CrW

Kinetic Study of Tungsten Atoms (a 7S3 and a 5DJ) in the Presence of C2H4 and NH3 at Room Temperature

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