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

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

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 (C=O-bound or NH-bound) with different SEP excit...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2005-03, Vol.307 (5714), p.1443-1446
Hauptverfasser: Clarkson, Jasper R., Baquero, Esteban, Shubert, V. Alvin, Myshakin, Evgeniy M., Jordan, Kenneth D., Zwier, Timothy S.
Format: Artikel
Sprache:eng
Schlagworte:
Chemistry
Cooling
Energy
Exact sciences and technology
General and physical chemistry
Hydrogen bonds
Isomerization
Isomers
Laser
Lasers
Mathematical minima
Molecular biology
Molecules
Monomers
Numbers
Reactants
Solutes
Solutions
Solvation
Solvation. Solvent properties
Spectrometer
Spectrometers
Spectroscopy
Water
Waves
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Beschreibung
Zusammenfassung: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 (C=O-bound or NH-bound) with different SEP excitation wavelengths. Energy (E) thresholds for isomerization in both directions have been measured [796 wave numbers ≤ E(C=O→NH) ≤ 988 wave numbers and 750 wave numbers ≤ E(NH→C=O) ≤ 988 wave numbers], and the energy difference ΔE between the C=O-bound and NH-bound isomers was extracted (-238 wave numbers ≤ ΔE ≤ +192 wave numbers).
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1106977