Zobrazeno 1 - 10
of 36
pro vyhledávání: '"C. B. Opal"'
Publikováno v:
Applied optics. 6(5)
A spectrometer system for studying excited state absorption of ions in crystals is described. Pulsed xenon short arc lamps and keyed photomultipliers are used to measure the transmission after optically pumping the ions into an excited state. A wide
Autor:
John A. Booth, C. B. Opal
Publikováno v:
SPIE Proceedings.
A focal reducer which converts the f/13.5 primary Cassegrain beam of the McDonald 2.1 m telescope to f/3.0 is described. The resulting plate scale is 30 microns/arcsec, which is a good match to the resolution of typical CCDs for seeing conditions of
Autor:
C. B. Opal, C. R. O'Dell, Jacobus H. Valk, Anita L. Cochran, Edwin S. Barker, William D. Cochran
Publikováno v:
The Astrophysical Journal. 388:621
Comet Austin (1989c1) was observed post-perihelion at a heliocentric distance near 1.25 AU. The wavelength range was from the atmospheric cutoff at 3000 to 4000 A. The coma spectra were calibrated into flux units and the contaminating sky spectrum an
Autor:
Anita L. Cochran, C. B. Opal, Edwin S. Barker, C. R. O'Dell, Christopher O. Miller, William D. Cochran
Publikováno v:
The Astrophysical Journal. 368:616
Spectrophotometric observations of Comet Brorsen-Metcalf from 300 to 360 nm with a resolution of about 0.1 nm are reported. The strongest features are OH 0-0(A-X) and 1-1 bands and the NH 0-0(A-X) bands. The CN 2-1 and 3-2(B-X) bands are verified and
Publikováno v:
Journal of Geophysical Research. 80:2327-2332
The possibility of using airglow techniques for estimating the electron density and height of the F layer is studied on the basis of a simple relationship between the height of the F2 peak and the column emission rates of the O I 6300 A and O I 1356
Autor:
Barrett H. Ripin, E. A. McLean, C. B. Opal, Andrew J. Schmitt, S. P. Obenschain, Jacob Grun, S. T. Kacenjar, M. H. Emery
Publikováno v:
Physical Review Letters. 53:1352-1355
We present the first absolute, two-dimensionally resolved measurements of areal mass density of laser-driven ablatively accelerated foils, which show the Rayleigh-Taylor instability developing from initial mass perturbations. Our data are near simula
Publikováno v:
Physical Review A. 5:712-723
The energy and angular distributions of electrons produced in the ionization of helium by electrons with energies between 100 eV and 2 keV have been measured in a crossed-beam apparatus consisting of a fixed hemispherical energy analyzer and a rotata
Autor:
C. B. Opal, E. C. Beaty
Publikováno v:
Journal of Physics B: Atomic and Molecular Physics. 5:627-635
The ratios of the inelastic electron scattering cross sections for the n=2 levels of helium to the corresponding elastic scattering cross sections have been measured in a crossed beam apparatus over the 30 degrees to 150 degrees range for incident en
Publikováno v:
Journal of Physics B: Atomic and Molecular Physics. 4:1020-1025
Reports the measurement of energy and angular distributions of electrons ejected from helium by 100 eV to 2000 eV electrons. The results are integrated over angle to give secondary electron energy distributions which are compared with recent Born app
Autor:
C. B. Opal, H. W. Moos
Publikováno v:
Journal of Geophysical Research. 74:2398-2401
Nighttime molecular O densities between 100- 130 km determined from Schumann-Runge absorption data for successive far UV spectra of hot star