Laboratory microwave spectrum of CH318OH

The microwave spectrum of (CH3OH)-O-18 has been observed in the frequency range from 95 to 200 GHz. This observation is an extension of the one made by Hoshino et al. in the frequency range below 95 GHz. Observed lines are those with J less than or equal to 39, K less than or equal to 8 for the A-species and with J less than or equal to 42, \K\ less than or equal to 7 for the E-species in the torsional ground state (upsilon(t) = 0) and some lines in the torsional excited state (upsilon(t) = 1-3). A total of 533 microwave lines with upsilon(t) less than or equal to 2, J less than or equal to 42, and K less than or equal to 8 have been fitted to 66 molecular constants by using the reduced Hamiltonian (Tang & Takagi) with a root mean square (rms) of 0.271 MHz, where the A and E substates are treated simultaneously. Three unidentified interstellar lines have been assigned to (CH3OH)-O-18 lines tentatively.