Activated vibrational modes and Fermi resonance in tip-enhanced Raman spectroscopy
(2013) In Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) 87(2).- Abstract
- Using p-aminothiophenol (PATP) molecules on a gold substrate and high-vacuum tip-enhanced Raman spectroscopy (HV-TERS), we show that the vibrational spectra of these 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 IR-active vibrational modes of dimercaptoazobenzene (DMAB), providing strong spectroscopic evidence for the dimerization of PATP molecules to DMAB under the TERS setup. 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. Fermi resonances are also observed in... (More)
- Using p-aminothiophenol (PATP) molecules on a gold substrate and high-vacuum tip-enhanced Raman spectroscopy (HV-TERS), we show that the vibrational spectra of these 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 IR-active vibrational modes of dimercaptoazobenzene (DMAB), providing strong spectroscopic evidence for the dimerization of PATP molecules to DMAB under the TERS setup. 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. Fermi resonances are also observed in HV-TERS. These findings help to broaden the versatility of TERS as a promising technique for ultrasensitive molecular spectroscopy. DOI:10.1103/PhysRevE.87.020401 (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3577933
- author
- Sun, Mengtao ; Fang, Yurui ; Zhang, Zhenyu and Xu, Hongxing LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
- volume
- 87
- issue
- 2
- article number
- 020401
- publisher
- American Physical Society
- external identifiers
-
- wos:000314879400004
- scopus:84874231984
- pmid:23496445
- ISSN
- 1539-3755
- DOI
- 10.1103/PhysRevE.87.020401
- language
- English
- LU publication?
- yes
- id
- d7e914a7-87a9-49f0-b32c-1aecd1c00f4f (old id 3577933)
- date added to LUP
- 2016-04-01 10:21:11
- date last changed
- 2022-04-27 21:12:53
@article{d7e914a7-87a9-49f0-b32c-1aecd1c00f4f,
abstract = {{Using p-aminothiophenol (PATP) molecules on a gold substrate and high-vacuum tip-enhanced Raman spectroscopy (HV-TERS), we show that the vibrational spectra of these 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 IR-active vibrational modes of dimercaptoazobenzene (DMAB), providing strong spectroscopic evidence for the dimerization of PATP molecules to DMAB under the TERS setup. 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. Fermi resonances are also observed in HV-TERS. These findings help to broaden the versatility of TERS as a promising technique for ultrasensitive molecular spectroscopy. DOI:10.1103/PhysRevE.87.020401}},
author = {{Sun, Mengtao and Fang, Yurui and Zhang, Zhenyu and Xu, Hongxing}},
issn = {{1539-3755}},
language = {{eng}},
number = {{2}},
publisher = {{American Physical Society}},
series = {{Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}},
title = {{Activated vibrational modes and Fermi resonance in tip-enhanced Raman spectroscopy}},
url = {{http://dx.doi.org/10.1103/PhysRevE.87.020401}},
doi = {{10.1103/PhysRevE.87.020401}},
volume = {{87}},
year = {{2013}},
}