Wang, Chih-Feng; Cheng, Zhihua; O’Callahan, Brian T.; Crampton, Kevin T.; Jones, Matthew R.; El-Khoury, Patrick Z. published the artcile< Tip-Enhanced Multipolar Raman Scattering>, Safety of 1-Hexadecylpyridin-1-ium chloride, the main research area is Tip Enhanced multipolar raman scattering; image thiobenzonitrile functionalized plasmonic gold nanocubes.
We record nanoscale chem. images of 4-thiobenzonitrile (TBN)-functionalized plasmonic gold nanocubes via tip-enhanced Raman spectroscopy (TERS). The spatially averaged optical response is dominated by conventional (dipolar) TERS scattering from TBN but also contains weaker spectral signatures in the 1225-1500 cm-1 region. The weak optical signatures dominate several of the recorded single-pixel TERS spectra. We can uniquely assign these Raman-forbidden transitions to multipolar Raman scattering, which implicates spatially varying enhanced elec. field gradients at plasmonic tip-sample nanojunctions. Specifically, we can assign observations of tip-enhanced elec. dipole-magnetic dipole as well as elec. dipole-elec. quadrupole driven transitions. Multipolar Raman scattering and local optical field gradients both need to be understood and accounted for in the interpretation of TERS spectral images, particularly in ongoing quests aimed at chem. reaction mapping via TERS.
Journal of Physical Chemistry Letters published new progress about Density functional theory (PBE). 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Safety of 1-Hexadecylpyridin-1-ium chloride.