Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 127, Issue 21, Pages 4843-4857Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.3c01334
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Overtones and combinational modes are important in ultrafast vibrational energy relaxation in liquid water, but they are weak and often overlap with fundamental modes in isotopologues mixtures. We used femtosecond stimulated Raman scattering (FSRS) to measure the Raman spectra of H2O and D2O mixtures and compared the results with calculated spectra. We identified specific modes and bands and their contributions, which can provide insight into Raman spectra interpretation and vibrational relaxation pathways in isotopically diluted water systems.
Overtones and combinational modes frequently play essentialrolesin ultrafast vibrational energy relaxation in liquid water. However,these modes are very weak and often overlap with fundamental modes,particularly in isotopologues mixtures. We measured VV and HV Ramanspectra of H2O and D2O mixtures with femtosecondstimulated Raman scattering (FSRS) and compared the results with calculatedspectra. Specifically, we observed the mode at around 1850 cm(-1) and assigned it to H-O-D bend + rockinglibration. Second, we found that the H-O-D bend overtoneband and the OD stretch + rocking libration combination band contributeto the band located between 2850 and 3050 cm(-1).Furthermore, we assigned the broad band located between 4000 and 4200cm(-1) to be composed of combinational modes of high-frequencyOH stretching modes with predominantly twisting and rocking librations.These results should help in a proper interpretation of Raman spectraof aqueous systems as well as in the identification of vibrationalrelaxation pathways in isotopically diluted water.
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