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Raman study of water deposited in solid argon matrix

Mohaček Grošev, Vlasta; Furić, Krešimir; Vujnović, Vedran (2022) Raman study of water deposited in solid argon matrix. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 269 . ISSN 1386-1425

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New Raman data are presented concerning H2O and D2O 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 PBEPBE1/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.

Item Type: Article
Uncontrolled Keywords: matrix isolation ; water clusters ; water oligomers ; low temperature spectroscopy ; Raman ; vibrations ; hydrogen bonding ; molecular dynamics simulation
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Chemistry > Physical Chemistry
Divisions: Division of Materials Physics
Project titleProject leaderProject codeProject type
Potpora vrhunskim istraživanjima Centra izvrsnosti za napredne materijale i senzoreIvanda, Mile; Jakšić, Milko; Stipčević, Mario; Kralj, MarkoKK.
Depositing User: Vlasta Mohaček Grošev
Date Deposited: 03 Apr 2023 13:52
DOI: 10.1016/j.saa.2021.120770

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