Study of the transient "free" OH radical generated in H2O-H2O2 mixtures by stimulated Raman scattering

Fangfang Li; Zhiwei Ma; Shenghan Wang; Tianyu Li; Chenglin Sun; Zhanlong Li; Zhiwei Men

doi:10.1016/j.saa.2016.12.026

Study of the transient "free" OH radical generated in H₂O-H₂O₂ mixtures by stimulated Raman scattering

Spectrochim Acta A Mol Biomol Spectrosc. 2017 Mar 15:175:246-249. doi: 10.1016/j.saa.2016.12.026. Epub 2016 Dec 20.

Authors

Fangfang Li¹, Zhiwei Ma¹, Shenghan Wang¹, Tianyu Li¹, Chenglin Sun¹, Zhanlong Li², Zhiwei Men³

Affiliations

¹ Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China.
² State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China. Electronic address: zlli@jlu.edu.cn.
³ Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China. Electronic address: zwmen@jlu.edu.cn.

PMID: 28043068
DOI: 10.1016/j.saa.2016.12.026

Abstract

Forward and backward stimulated Raman scattering (SRS) were studied in the H₂O₂-H₂O mixtures by a strong excitation laser with 532nm. Only the backward SRS (BSRS) of the H₂O₂-H₂O system shows an unexpected SRS shoulder peak at around 3600cm^-1, which is similar to the characteristic peak of "free" OH radical. The generation of the "free" OH radical is mainly attributed to the dissociation of hydrogen peroxide (HP) molecules. Simultaneously, the ionization of HP-water clusters generates a part of "free" OH radical under the Laser-induced breakdown (LIB). The interaction of water and HP is also discussed.

Keywords: H(2)O-H(2)O(2); Laser-induced breakdown; Stimulated Raman scattering; “Free” OH radical.

Publication types

Review