Abstract

The photodissociation spectrum has been measured for methanol dimers in the region of the nu/sub 8/ C-O stretching vibration from 1025 to 1085 cm/sup -1/. The absorption peak corresponding to single-photon dissociation has a Lorentzian line shape, with a full-width at half-maximum of 13.8 cm/sup -1/. The monomer product recoil energies are extremely small - about 0.2% of the initial photon energy - consistent with the expectation that the photon energy is just barely sufficient to break the hydrogen bond. The combined line width and speed distribution data suggest that the state relaxation rate which is responsible for the line width is greater than the rate of vibrational predissociation. 3 figures.

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