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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenWed, 06 Dec 2023 14:11:20 +0000Correlation between infrared intensities, dissociation energies, and equilibrium internuclear distances for diatomic molecules
https://resolver.caltech.edu/CaltechAUTHORS:20110120-091949408
Authors: Aroeste, Henry
Year: 1954
DOI: 10.1063/1.1740373
N/Ahttps://authors.library.caltech.edu/records/d7946-gfr13Vibrational relaxation times of diatomic molecules and rocket performance
https://resolver.caltech.edu/CaltechAUTHORS:20110119-103028935
Authors: Penny, H. C.; Aroeste, Henry
Year: 1955
DOI: 10.1063/1.1742258
Computations are presented for the variation of vibrational excitation probabilities with temperature for mixtures of O_2 and N_2, and of HF and H_2. The values of six different excitation probabilities in each mixture are reported for temperatures up to 3000ºK. For each of the probabilities there is a lower temperature limit given, below which the theory of Schwartz, Slawsky, and Herzfeld, which is used here, is not applicable. Using the results for H_2-HF mixtures, we present some considerations which suggest that the expansion through the de Laval nozzle for representative H_2-F_2 rocket motors may be taken as vibrational near-equilibrium flow.https://authors.library.caltech.edu/records/t3xe2-k7e98On the determination of absolute intensities from single- and multiple-path absorption measurements
https://resolver.caltech.edu/CaltechAUTHORS:20110119-112148460
Authors: Penner, S. S.; Aroeste, H.
Year: 1955
DOI: 10.1063/1.1740731
The physical principles involved in conventional absolute intensity measurements are reviewed. Experimental
difficulties rule out the use of extrapolation techniques for some spectral transitions. For this reason it is of interest to re-examine the possibility of using total absorption measurements, in conjunction with the curves of growth, for making intensity estimates. Extrapolation methods yield results which are independent of spectral line shape. Use of the curves of growth, on the other hand, implies the assumption that the line contour can be described by combined Doppler and Lorentz broadening.
The curves of growth permit a unique correlation between total absorption and f-value either for spectral lines with pure Doppler broadening or for pure collision broadening. Furthermore, a simple experimental procedure can be devised for estimating both the absolute intensity and the spectral line profile on the basis of single-path and multiple-path absorption measurements. The suggested procedure involves absorption' measurements for optical densities (path lengths) under conditions in which the integrated fractional absorption is a relatively sensitive function of spectral line shape. Representative calculations referring to utilization of the proposed method have been carried out for spectral lines belonging to the ^2∑→^2II transitions, (0,0)-band, of OH, and also for lines belonging to the fundamental vibration-rotation spectrum of CO.https://authors.library.caltech.edu/records/pm0v7-njf60Emissivity of hydrogen atoms at high temperatures
https://resolver.caltech.edu/CaltechAUTHORS:20110126-072952200
Authors: Aroeste, Henry; Benton, William C.
Year: 1956
DOI: 10.1063/1.1722319
A method is described for making estimates of the total emissivity of hydrogen in the temperature and pressure ranges where hydrogen atoms predominate under equilibrium conditions. For a typical geometrical depth of 50 cm, and temperatures of the order of 12 500ºK and higher, with pressures of the order of 100 atmos and higher, the emissivity approaches unity (є≳0.95), while for temperatures of the order of 9500ºK and lower, with pressures of the order of 10 atmos and lower, the emissivity approaches zero (є≾0.05). The variations of the emissivity between these approximate limits are shown graphically as functions of temperature and pressure with the geometrical depth set at 50 cm. The variation of the emissivity with geometrical depth is also shown graphically at 12 600ºK and 20 atmos.https://authors.library.caltech.edu/records/q2ewq-jej77Emissitivity of hydrogen atoms at high temperature
https://resolver.caltech.edu/CaltechAUTHORS:20110114-132802630
Authors: Aroeste, Henry; Benton, William C.
Year: 1956
DOI: 10.1063/1.1722319
A method is described for making estimates of the total emissivity of hydrogen in the temperature and pressure ranges where hydrogen atoms predominate under equilibrium conditions. For a typical geometrical depth of 50 cm, and temperatures of the order of 12 500ºK and higher, with pressures of the order of 100 atmos and higher, the emissivity approaches unity (є ≳ 0.95), while for temperatures of the order of 9500ºK and lower, with pressures of the order of 10 atmos and lower, the emissivity approaches zero (є ≾ 0.05). The variations of the emissivity between these approximate limits are shown graphically as functions of temperature and pressure with the geometrical depth set at 50 cm. The variation of the emissivity with geometrical depth is also shown graphically at 12 600ºK and 20 atmos.https://authors.library.caltech.edu/records/srrhr-7g406