Raman study of water deposited in solid argon matrix

New Raman data are presented concerning H2O and D20 water aggregation in argon matrix having the ratio of number of argon atoms to water molecules close to 40:1. Experiments were conducted at temperatures from 8 K to 34 K allowing observation of OH and OD stretching vibrations of water monomers, dimers, trimers and higher multimers, as well as broad bands corresponding to solid amorphous water. Molecular dynamics simulations were performed for thirteen or sometimes fourteen water molecules dispersed among 500 argon atoms. Resulting final configurations included dimers, trimers, tetramers and pentamers, all in open chain configurations which upon optimization resulted in mostly cyclic conformations. Observed OH stretching vibrations were assigned by comparing calculated normal modes in harmonic approximation at the B3LYP/aug-cc-pVDZ and PBEPBEl/aug-cc-pVDZ level of theory with our data and previously observed bands from infrared matrix isolation studies and Raman jet cooled experiments. Raman bands assigned to water multimers in argon matrix are shifted 20 to 25 cm(-1) towards lower wavenumbers with respect to the positions of OH stretching vibrations of almost free water clusters. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study presents new Raman data on the aggregation of H2O and D20 water in an argon matrix, and performs molecular dynamics simulations. The results show that water molecules form dimers, trimers, tetramers, and pentamers, and the assignment of OH stretching vibrations is confirmed by comparing with theoretical calculations and previous experiments. The study also reveals a shift in the Raman bands of water molecules in the argon matrix compared to free water clusters.