Physics of molecules
Molecular physics research on maser spectroscopy, electron excitation, molecular spectra of cesium, and related topics
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A solid state detector experiment for electron measurements on OGO-F
Design criteria for solid state detectors for orbiting geophysical observatory onboard electron flux and spectra measurements
Trainor, J. H.↗
Electron spin resonance of a gamma-irradiated single crystal of 5-nitro-6-methyluracil.
Free radicals in gamma irradiated 5-nitro-6- methyluracil identified with electron spin resonance spectra
Benson, B.↗
A computer program for a line-by-line calculation of spectra from diatomic molecules and atoms assuming a Voight line profile
Computer program predicts the spectra resulting from electronic transitions of diatomic molecules and atoms in local thermodynamic equilibrium. The program produces a spectrum by accounting for the contribution of each rotational and atomic line considered.
Arnold, J. O.↗
Emission spectra excited in benzene.
Molecular benzene emission spectra excited by electron beams in RF modulated source, tabulating lifetime measurements
Smith, W. H.↗
Electron spin resonance of gamma-irradiated single crystals of 9-methyladenine.
Electron spin resonance spectra of gamma irradiated single crystals of 9-methyladenine, analyzing H abstraction radical and temperature effects
Schmidt, J.↗
The soft particle spectrometer in the ISIS-I satellite
Soft particle spectrometer in Isis-I satellite using electrostatic deflection for differential energy spectra measurements for electrons and protons
Heikkila, W. J.↗
The effect of polyatomic adsorbates on the total energy distribution of field emitted electrons
Polyatomic organic adsorbates effect on field emission total energy distribution from W and Mo surfaces, discussing electronic and phononic spectra
Crouser, L. C.↗
Discrete spectra and damped waves in quasilinear theory
Quasi-linear equations consequences in discrete spectra and damped electron plasma waves, discussing conservation laws relation to resonance approximation
Montgomery, D.↗
Ferromagnetic resonance of lunar samples
Ferromagnetic electron spin resonance spectra of Apollo 11 lunar samples, using model for polycrystalline spectra simulation
Chan, S. I.↗
Development of space stable thermal control coatings for use on large space vehicles
The evaluation and environmental testing of zinc orthotitanate pigments for use as space stable thermal control coatings on large space vehicles are discussed. Electron paramagnetic resonance spectra of the pigments and their precursor compounds are examined. A continuing study of the spectral intensity of mercury-argon and mercury-xenon sources in reported. Results of long term environmental testing of commercially available, strippable, protective coatings are discussed.
Gilligan, J. E.↗
Particle astronomy with a superconducting magnet.
The magnetic spectrometer measures deflections of charged particles moving in a magnetic field and provides a direct means of determining the rigidity of charged primary cosmic rays up to about 100 GV/c rigidity. The underlying concepts of the method are reviewed, and factors delineating the applicable momentum range and accuracy are described along with calibration techniques. Previous experiments employing this technique are summarized, and prospects for future applications are evaluated with emphasis on separate measurement of electron and positron spectra and on isotopic separation.
Buffington, A.↗
Possible low energy (E less than keV) nonthermal X-ray events
A search of the 3- to 30-keV data from the NRL proportional counter detector on the Orbiting Geophysical Observatory-5 (OGO-5) satellite has yielded several events which may be nearly completely nonthermal in the e greater than 3 and less than 10 keV range. In each case an impulsive hard X-ray burst accompained by an impulsive microwave burst was associated with a low energy X-ray burst whose profile was a simple rise and fall. The lack of a two component nature in the low energy range argues that the low energy X-ray flux is due to a single physical mechanism, in this case nonthermal bremsstrahlung from accelerated electrons. However, the spectra and time profiles are quite consistent with a thermal interpretation. Polarization measurements are probably necessary to resolve the physical origin of such bursts.
Kahler, S. W.↗
Solar particles /observations, relationship to the sun acceleration, interplanetary medium/
The major features of the propagation of flare particles in the interplanetary medium are discussed in terms of the classic well-behaved flare having unique impulsive injection and a smooth time profile. Topics include flare events, their frequency of occurrence, development of a typical event, energy spectra, proton and electron types, charge and isotopic composition, solar flares and particle accelerations, radio and X-ray observations, the Fermi mechanism, the betatron mechanism, acceleration models, plasma instabilities, two-stage acceleration, propagation mechanisms, the anisotropic stage, the diffusive stage, and the convection and energy loss stage.
Mcdonald, F. B.↗
Improved space radiation shielding methods
The computing software that was used to perform the charged particle radiation transport analysis and shielding design for the Mariner Jupiter/Saturn 1977 spacecraft is described. Electron fluences, energy spectra and dose rates obtained with this software are presented and compared with independent computer calculations.
Davis, H. S.↗
XUV electron density diagnostics for solar flares
Potential electron-density diagnostics for the high-temperature component of solar flares are studied with reference to the wavelength region from 171 to 630 A. The specific ions discussed include Fe IX through Fe XV, Ni XI through Ni XVII, and ions in the beryllium, boron, carbon, and nitrogen isoelectronic sequences. Line ratios that could be useful as density indicators under solar-flare conditions are indicated, available data for the ions considered are reviewed, and several theoretical intensity ratios are plotted. The results are employed to determine the electron-density distribution as a function of electron temperature for several spectra from two flares. For these flares it is found that the electron density increases from 10 billion to 500 billion per cu cm for a temperature increase from 1 million to 10 million K.
Dere, K. P.↗
Effect of ionophores on the rate of intramolecular cation exchange in durosemiquinone ion pairs
The effects of the ionophores 15-crown-5 (15C5), 18-crown-6 (18C6), dibenzo-18-crown-6 (DBC) and cryptand 222 (C222) on intramolecular cation exchange in ion pairs of the sodium salt of the durosemiquinone anion in benzene solution are investigated. Electron paramagnetic resonance spectra of the 18C6 and 15C5 complexes with durosemiquinone reduced by contact with a sodium mirror show an alternating line width which indicates that the sodium ion is being exchanged between equivalent sites near the oxygens of the semiquinone with activation energies of 8.7 and 6.0 kcal/mole and Arrhenius preexponential factors of 9 x 10 to the 12th/sec and 10 to the 12th/sec, respectively. Spectra obtained for the DBC complexes show no evidence of exchange, while those of C222 indicate rapid exchange. It is also noted that the hyperfine splitting constants measured do not change over the 50-K temperature interval studied.
Eastman, M. P.↗
Spacecraft radio scattering observations of the power spectrum of electron density fluctuations in the solar wind
Solar wind electron density power spectra in the solar equatorial region are inferred from observations of phase scintillations and spectral broadening made with the Viking, Helios, and Pioneer spacecraft. The heliocentric distance range covered is 2-215 solar radii and for some observations close to the sun the spectra extend to fluctuation frequencies as high as 100 Hz. For heliocentric distances of about 20 solar radii the equivalent spacecraft-measured one-dimensional density spectrum is well modeled by a single power law in the frequency range 0.0001-0.05 Hz. The flattening of the density spectrum within 20 solar radii is presumably associated with energy deposition in the near-sun region and acceleration of the solar wind.
Woo, R.↗