Laser-Initiated Shuttling of a Water Molecule Between H-Bonding Sites

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Science  04 Mar 2005:
Vol. 307, Issue 5714, pp. 1443-1446
DOI: 10.1126/science.1106977

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The two-step laser excitation scheme of stimulated emission pumping (SEP) induces shifts of a single water molecule between two remote hydrogen bonding sites on trans-formanilide. This reaction can be initiated by selective excitation of either isomer (CEmbedded ImageO-bound or NH-bound) with different SEP excitation wavelengths. Energy (E) thresholds for isomerization in both directions have been measured [796 wave numbers ≤ E(CEmbedded ImageO→NH) ≤ 988 wave numbers and 750 wave numbers ≤ E(NH→CEmbedded ImageO) ≤ 988 wave numbers], and the energy difference DE between the CEmbedded ImageO-bound and NH-bound isomers was extracted (–238 wave numbers ≤ DE ≤ +192 wave numbers).

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