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The absorption spectrum of the Schumann-Runge bands of isotopic oxygen, $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O18O$, has been investigated with a 6.65 m vacuum spectrograph in the wavelength region 175-198 nm. The absorption cell, 50 cm in length, can be cooled with liquid nitrogen. Most of bands are as diffuse as those of other isotopic molecules of oxygen. The diffuseness of absorption lines of the isotopes vares slightly and will be demonstrated. Rotational analyses have been completed for (16,0) through (2,0) bands. This work is supported by NASA grant NAG5-484 to Smithsonian Astrophysical Observatory. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138