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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 66, Iss. 7 — Jul. 1, 2012
  • pp: 740–743

Measurement of the Raman Line Widths of Neat Benzenethiol and a Self-Assembled Monolayer (SAM) of Benzenethiol on a Silver-Coated Surface-Enhanced Raman Scattering (SERS) Substrate

Roshan L. Aggarwal, Lewis W. Farrar, Nathan G. Greeneltch, Richard P. Van Duyne, and Dennis L. Polla

Applied Spectroscopy, Vol. 66, Issue 7, pp. 740-743 (2012)


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Abstract

Raman line widths of neat benzenethiol and a self-assembled monolayer (SAM) of benzenethiol on a surface-enhanced Raman scattering (SERS) substrate have been measured using a mini spectrometer with a resolution (full width at half-maximum) of 3.3 ± 0.2 cm−1. Values of 7.3 ± 0.7, 4.6 ± 0.6, 2.4 ± 0.6, 3.2 ± 0.5, 8.8 ± 0.9, and 11.0 ± 1.1 cm−1 have been determined for the Raman line widths of the 414, 700, 1001, 1026, 1093, and 1584 cm−1 modes of neat benzenethiol. Values of 13.3 ± 0.7, 9.1 ± 0.7, 5.1 ± 0.6, 5.9 ± 0.6, 13.3 ± 0.5, and 8.7 ± 0.5 cm−1 have been determined for the SERS line widths of a benzenethiol SAM on a silver-coated SERS substrate for the corresponding frequency-shifted modes at 420, 691, 1000, 1023, 1072, and 1574 cm−1. The line widths for the SERS modes at 420, 691, 1000, 1023, and 1072 cm−1 are about a factor of two larger than those of the corresponding Raman modes. However, the line width of the SERS mode at 1574 cm−1 is slightly smaller than the corresponding Raman mode at 1584 cm−1.

Citation
Roshan L. Aggarwal, Lewis W. Farrar, Nathan G. Greeneltch, Richard P. Van Duyne, and Dennis L. Polla, "Measurement of the Raman Line Widths of Neat Benzenethiol and a Self-Assembled Monolayer (SAM) of Benzenethiol on a Silver-Coated Surface-Enhanced Raman Scattering (SERS) Substrate," Appl. Spectrosc. 66, 740-743 (2012)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-66-7-740

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