Physics – Atomic and Molecular Clusters
Scientific paper
2011-12-19
Physics
Atomic and Molecular Clusters
Scientific paper
Using p-aminothiophenol (PATP) molecules on a gold substrate as prototypical examples and high vacuum tip-enhanced Raman spectroscopy (HV-TERS), we show that the vibrational spectra of those molecules are distinctly different from those in typical surface-enhanced Raman spectroscopy. Detailed first-principles calculations help to assign the Raman peaks in the TERS measurements as Raman active and infrared (IR) active vibrational modes of dimercaptoazobenzene (DMAB), thus providing strong spectroscopic evidence for the conversion of PATP dimerization to DMAB. The activation of the IR active modes is due to enhanced electromagnetic field gradient effects within the gap region of the highly asymmetric tip-surface geometry. Our TERS measurements also realize splitting of certain vibrational modes due to Fermi resonance between a fundamental mode and the overtone of a different mode or a combinational mode. These findings help to broaden the versatility of TERS as a promising technique for ultrasensitive molecular spectroscopy.
Fang Yurui
Sun Mengtao
Xu Hongxing
Zhang Zhenyu
No associations
LandOfFree
Activated Vibrational Modes and Fermi Resonance in Tip-Enhanced Raman Spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Activated Vibrational Modes and Fermi Resonance in Tip-Enhanced Raman Spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Activated Vibrational Modes and Fermi Resonance in Tip-Enhanced Raman Spectroscopy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-209932