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THOMAS R. GEBALLE, Joint Astronomy Centre, Hilo, HI 96720; TAKESHI OKA, Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637.
After more than 15 years of searching,\!\! \!\!,\!\! \hhh has finally been detected in interstellar space.\!\! Three vibration-rotation transitions in the 3.7 µm region, R(1,0) of ortho-\hhh, and R(1,1)+ and R(1,1)- of para-\hhh have been observed in absorption using the CGS4 infrared spectrometer at the United Kingdom Infrared Telescope towards young stellar objects GL2136 and W33A which are deeply embedded in dense molecular clouds. The observation provides the most direct evidence supporting the ion-neutral reaction scheme of interstellar chemistry proposed initally by Herbst and Klemperer and by Watson.