Infrared absorption of silane, ammonia, acetylene and diborane in the range of the CO2 laser emission lines: Measurements and modelling

Förster, J.; Hagen, Th.; Hoesslin, M. von; Uhlenbusch, J.

doi:10.1007/bf01080954

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…The poor fit in left wing in the data could be due to Mie scattering owing to droplet size effects or could be another resonant peak at lower wavelength lower than the laser tuneability limit of 9.22 µm -which range from 1 to 3 kJ mol −1 K −1 , the specific heat capacity for the laser excited V-(OC 2 H 5 ) 3 and W-(OC 2 H 5 ) 6 are found to be unusually very small of the order of 10 −5 kJ mol −1 K −1 or less. These new values are compatible with electron specific heat capacity factor which is given [27,28] as…”

Section: Resultsmentioning

confidence: 80%

Flame temperature trends in reacting vanadium and tungsten ethoxide fluid sprays during CO2-laser pyrolysis

Mwakikunga

Mudau²,

Brink

et al. 2011

Appl. Phys. B

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We observe the "invisible-to-the-naked-eye" flames of tungsten and vanadium ethoxide aerosols when ignited at moderate laser excitation (0 < P laser < 70 W) by employing an IR thermo-graphic camera. No emission is seen in the visible range whether by the visible region cameras or by spectroscopy. The emissivity of the precursor solution measured was 0.80 and 0.75 for tungsten and vanadium ethoxide, respectively. The spectral emissivities of the tungsten and vanadium ethoxide flames measured using FTIR-spectrometer were used to calculate the pyrolysis flame temperature at various laser intensities and wavelengths. New energy balance equations have been derivedthe transient temperature one extended from HaggertyCannon equation and the other based on standard resonance analysis. Fitting these models to experimental data reveals that only small amounts (1.33% and 4.32%, respectively) of the laser power are used in the pyrolysis of the precursor ethoxide aerosols into the desired oxide nanostructures. The low levels of specific heat capacity values obtained in these sprays suggest that these are electronic heat capacities rather than lattice heat capacities; enthalpies are also obtained. The experimental temperature-laser power trends observed were in agreement with previous findings from Tenegal et al. (Chem. Phys. Lett. 335:155, 2001). The damping coefficients, and hence the saturation intensities confirm that the vanadium containing precursor liquid is harder to dissociate into final products than the tungsten precursor as observed experimentally.

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Section: Resultsmentioning

confidence: 80%

Flame temperature trends in reacting vanadium and tungsten ethoxide fluid sprays during CO2-laser pyrolysis

Mwakikunga

Mudau²,

Brink

et al. 2011

Appl. Phys. B

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“…It was reported earlier [6] that pure acetylene flow inside a diffusion O 2 /H 2 flame generated carbon shell-shaped nanoparticles when irradiated with a 10.56 μm cw CO 2 laser in spite of the fact that acetylene practically does not absorb the laser frequency [7]. The generation phenomenon was ascribed in Ref.…”

Section: Introductionmentioning

confidence: 93%

“…The curve can be found from Eqs. (5)-(7) after their linearization at n to the asymptotic solution of the soliton type when the soliton is far on the right side from z=0, therefore for Eq. (11) the asymptotic of the exact solution of Eq.…”

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confidence: 99%

Co2 Laser-Driven Reactions in Pure Acetylene Flow

Pikhitsa¹,

Kim²,

Choi³

2017

Science Evolution

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We show that multiple-photon absorption of radiation from a 10.56 μm cw CO 2 laser by intermediates (ethylene, vinylidene) generated in pure acetylene flow makes them decompose to carbon dimers and excited hydrogen. The latter associates with downstream acetylene to feedback those laser absorbing intermediates thus making the reactions self-sustained in the absence of oxygen. This process is different from acetylene self-decomposition that may occur at higher temperature and pressure. The results of our work may be useful for understanding the generation of various carbon allotropes and interstellar dust from acetylene.3

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Laser-assisted plasma-enhanced chemical vapor deposition of silicon nitride thin film

Tsai

Jaw

Chang

et al. 2000

Surface and Coatings Technology

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Infrared absorption of silane, ammonia, acetylene and diborane in the range of the CO2 laser emission lines: Measurements and modelling

Cited by 3 publications

References 15 publications

Flame temperature trends in reacting vanadium and tungsten ethoxide fluid sprays during CO2-laser pyrolysis

Flame temperature trends in reacting vanadium and tungsten ethoxide fluid sprays during CO2-laser pyrolysis

Co2 Laser-Driven Reactions in Pure Acetylene Flow

Laser-assisted plasma-enhanced chemical vapor deposition of silicon nitride thin film

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