AI Article Synopsis
- The study uses femtosecond mid-infrared pump-probe spectroscopy to investigate the energy relaxation of OH stretch vibrations in HDO molecules within a water bridge composed of HDO:D(2)O.
- The vibrational lifetime of HDO in the water bridge is found to be shorter (around 630 fs) compared to that in bulk water (about 740 fs).
- In contrast, the thermalization dynamics after vibrational relaxation are slower in the water bridge (approximately 1.5 ps) compared to bulk water (around 250 fs), suggesting significant molecular differences between the two environments.
Article Abstract
We report the energy relaxation of the OH stretch vibration of HDO molecules contained in an HDO:D(2)O water bridge using femtosecond mid-infrared pump-probe spectroscopy. We found that the vibrational lifetime is shorter (~630 ± 50 fs) than for HDO molecules in bulk HDO:D(2)O (~740 ± 40 fs). In contrast, the thermalization dynamics following the vibrational relaxation are much slower (~1.5 ± 0.4 ps) than in bulk HDO:D(2)O (~250 ± 90 fs). These differences in energy relaxation dynamics strongly indicate that the water bridge and bulk water differ on a molecular scale.
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| http://dx.doi.org/10.1039/c1cp22358e | DOI Listing |
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