Observation of Paramagnetic Raman Optical Activity of Nitrogen Dioxide

Authors

  • Dr. Jaroslav Šebestík,

    Corresponding author
    1. Department of Molecular Spectroscopy, Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague (Czech Republic)
    • Department of Molecular Spectroscopy, Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague (Czech Republic)

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  • Prof. Petr Bouř

    Corresponding author
    1. Department of Molecular Spectroscopy, Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague (Czech Republic)
    • Department of Molecular Spectroscopy, Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague (Czech Republic)

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  • The work was supported by the Academy of Sciences (grant number M200550902), Grant Agency of the Czech Republic (grant numbers P208/11/0105 and 14-00431S), and Ministry of Education (grant number LH11033). We thank Mr. Ondřej Pačes and Dr. Josef Kapitán for the help with the magnetic cell construction, and Dr. Radek Pelc for discussions on the manuscript.

Abstract

Raman optical activity (ROA) detects the intensity difference between right and left circularly polarized scattered light, and thus brings about enhanced information about the molecules under investigation. The difference is quite small and the technique is mostly constrained to the condensed phase. For NO2 in the presence of a static magnetic field, however, the ROA signal with high ROA/Raman intensity ratio was observed. The signal is so strong owing to molecular paramagnetism and a pre-resonance signal enhancement. The spectral shape was explained on the basis of the Fermi golden rule and rotational wave functions expanded to a spherical top basis. The results indicate that the technique can be immediately used to obtain information about molecular properties, such as polarizability components. It also has a potential to detect other paramagnetic gases and discriminate among them.

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