Experimental determination of the oscillator strengths for the A2Σ-X2Σ band system of aluminum oxide

Vanpee, M.; Kineyko, William R.; Caruso, Ronald

doi:10.1016/s0010-2180(70)80052-9

Cited by 32 publications

(3 citation statements)

References 6 publications

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“…Here again absolute intensity measurements are difficult because they are subject to large systematic uncertainties in the determination of the molecular concentration. The oscillator strengths determined by this method by Vanpee et al (1970) from flame emission and by Hooker k Main (1971) from shock-tube absorption are an order of magnitude shorter than the most recent values deduced from laser fluorescence. Other emission intensity measurements by Hebert k Tyte (1964) and by Tyte k Hebert (1964) as well as shock-tube studies by Linton k Nicholls (1969) were re-calibrated by Hebert et al (1980) using independently determined lifetimes (Johnson et al 1972;Dagdigian et al 1975); thus the concentration measurement problem was avoided and more reliable values could be obtained.…”

Section: Boron and Aluminium Oxides: B 0 2 Bo Alomentioning

confidence: 68%

Oscillator Strengths and Excited State Lifetimes in Metallic Hydrides and Oxides

Schamps

1994

International Astronomical Union Colloquium

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It is really impressive to see the amount of information astrophysicists have been able to extract from the analysis of that faint glimmering light that stars se,nd to tell us about them. The main piece of this analysis consists in dispersing the light to get the spectrum, that is to say intensity versus wavenumbers. From the measurements of wavenumbers it is possible to identify the atomic and molecular species from comparison with high-resolution laboratory spectroscopic data. Once the constituents have been identified, models can be constructed in order to simulate the metabolism of circumstellar atmospheres. In such models a crucial point is the abundance of the identified atomic and molecular constituents.

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Section: Boron and Aluminium Oxides: B 0 2 Bo Alomentioning

confidence: 68%

Oscillator Strengths and Excited State Lifetimes in Metallic Hydrides and Oxides

Schamps

1994

International Astronomical Union Colloquium

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“…From the flame species composition given by Vanpee et aZ., 21 we calculated an A10 concentration of 5 x mole fraction, for an additive total mole fraction of A1 of 2.6 x This concentration would yield an f number of approximately 1 x…”

Section: Discussionmentioning

confidence: 99%

Mass spectrometer studies of Al + H2O reactions in effusion cells and in atmospheric H2+ O2 flames

Farber¹,

Srivastava²,

Frisch³

et al. 1973

Faraday Symp. Chem. Soc.

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A two-fold mass spectrometer study of the A1 + H 2 0 reactions in effusion cells and in atmospheric H z + O t flames was conducted. The flame studies yielded a Dg of 119.5 f5 kcal/mole for A10, in agreement with the results of previous thermochemical and spectroscopic investigations. A discussion concerning the discrepancy between the data obtained in these and previous flame experiments is presented. The major Al-0-H species in both the effusion and the flame studies was NOH, with a AHfZ9* of -42.7+2 kcal/mole. The flame studies also produced other suboxides of aluminum, as well as the species A102H, for which a AHf298 of -90+ 5 kcal/mole was obtained.Considerable controversy has existed for several years concerning the high temperature chemistry and thermodynamics of reactions involving Al and H20. Widely discrepant data have been reported by various investigators. For example, the dissociation energy of A10 obtained from effusion experiments has differed by as much as 100 kJ from the results of recent spectroscopic measurements of aluminium additives in flames. The identity of the major Al-0-H flame species, as well as their thermodynamics, has also been in dispute.A wide discrepancy exists regarding the results of two groups of experiments :(1) Knudsen effusion, Langmuir evaporation, transpiration, spectroscopic and mass spectrometric ; and (2) combustion and flame spectroscopy.6-8 Concerning the dissociation energy of AlO, the controversy involves an A10 bond energy differing by a maximum of only 5 or 6 kcal among the various types of experiments in group (l), which in turn differ by as much as 20 kcal with those of group (2).Gurvich and Veyts were among the early workers who examined the behaviour of aluminum in flames. Recently, papers by Jensen and Jones and Newman and Page reported results of studies of aluminum additives to H2 + N2 + O2 flames.Jensen and Jones obtained -5+ 10 kcal for AHfZ9&lO, which is in agreement with the second and third law D; values of 601 & 34 kJ and 5 8 9 2 75 kJ, respectively, reported by Newman and Page.These three papers 6-8 recommend a value for the heat of formation of A10 which is 20 kcal more negative than the spectroscopic value of 16.57 kcal/mole obtained by Tyte and MacDonald and Innes (DZ = 506 kJ/mol), and the value of 17.0 kcal/ mole obtained by Farber et aZ.,3 in an effusion-mass spectrometer study under neutral conditions of the vapour species over alumina in the temperature range 1943-2093 K. Gole and Zare recently studied the visible chemiluminescence in a cross-beam experiment involving a thermal beam of aluminium atoms, -1700 K, intersecting an uncollimated beam of ozone molecules, 300K, and reported a minimum value of 17.6 kcal/mole for AHf298A10. In carrying out a rotational analysis of two emission bands found near 2500 and 2800 A, MacDonald and Innes deduced that the observed spectra corresponded to emission from two highly-excited states of A10 to a common 1962,127,1674. (Dow Chemical Co. JANAF ThermochemicaE Tables

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“…Jr., et 01., 1970, Nicholls R. W. and Pritchard, H. D., 1970, relative populations of excited electronic levels could be calculated from the ratio of observed spontaneous emission intensities, and compared with equilibrium values. 4) Relative vibrational level populations could be calculated from band intensity ratios, as described by Herzberg (1950), Vanpee, Kineyko, and Caruso (1970), Hebert and Tyte (1964), Naegeli (1967) and others. Separation of overlapping bands could be performed by the extrapolation technique described by Hebert and Tyte (1964) and Vanpee et 01.…”

Section: H Additional Reactions Of Interestmentioning

confidence: 99%

Chemical Laser Action in Low Pressure Metal Vapor Flames

Zwillenberg

Naegeli

Glassman

1973

Combustion Science and Technology

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Chemiluminescence in the visible has indicated the production of electronically excited products in the low pressure reactions of alkaline earth metals with o'ygen, halogens, halogen compounds and other oxidants. Thermochemical calculations on many such systems have indicated energy release more than adequate for electronic excitation of the product molecules. Comparisons of radiative lifetimes, rates of chemical reaction and col. Iisional de-excitation indicate the possibility of population inversion and chemical laser action based on such electronically excited product molecules.The literature is reviewed to analyze the theoretical possibility of lasing action using alkaline earth systems. Although spin-conservation laws limit the rates of certain reactions, there appears to be sufficient promise to this approach.

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Experimental determination of the oscillator strengths for the A2Σ-X2Σ band system of aluminum oxide

Cited by 32 publications

References 6 publications

Oscillator Strengths and Excited State Lifetimes in Metallic Hydrides and Oxides

Oscillator Strengths and Excited State Lifetimes in Metallic Hydrides and Oxides

Mass spectrometer studies of Al + H2O reactions in effusion cells and in atmospheric H2+ O2 flames

Chemical Laser Action in Low Pressure Metal Vapor Flames

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