Time-resolved photoelectron imaging of large anionic methanol clusters: (methanol)n-(n approximately 145-535) |
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Authors: | Kammrath Aster Griffin Graham B Verlet Jan R R Young Ryan M Neumark Daniel M |
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Institution: | Department of Chemistry, University of California, Berkeley, California 94720, USA. |
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Abstract: | The dynamics of an excess electron in size-selected methanol clusters is studied via pump-probe spectroscopy with resolution of approximately 120 fs. Following excitation, the excess electron undergoes internal conversion back to the ground state with lifetimes of 260-175 fs in (CH3OH)n- (n=145-535) and 280-230 fs in (CD3OD)n- (n=210-390), decreasing with increasing cluster size. The clusters then undergo vibrational relaxation on the ground state on a time scale of 760+/-250 fs. The excited state lifetimes for (CH3OH)n- clusters extrapolate to a value of 157+/-25 fs in the limit of infinite cluster size. |
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