HIGH RESOLUTION CROSS SECTIONS AND BAND OSCILLATOR STRENGTHS OF THE SCHUMANN-RUNGE BANDS OF ISOTOPIC OXYGEN

Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138Author Institution:Photoabsorption cross sections of isotopic oxygen, $^{16}O_{2}, ^{18}O_{2}$, and $^{16}O^{18}O$, at 79K have been obtained from photoabsorption measurements at various pressures throughout the wavelength region 179-201 nm with a 6.65 m photoelectric scanning spectrometer. The absolute cross sections are obtained for the (12,0) through (2,0) band of $^{16}O_{2}, (14,0)$ through (2,0) bands, except for the (12,0) band, of $^{18}O_{2}$, and (13,0) through (3,0) bands of $^{16}O^{18}O$. Band oscillator strengths of these bands have been determined by direct numerical integration of the measured cross sections. This work is supported by NASA grant NAG5-484 to Smithsonian Astrophysical Observatory