Deep ultraviolet Raman spectroscopy: A resonance-absorption trade-off illustrated by diluted liquid benzene
Document ID: 216
Chadwick, Christopher Todd1
Willitsford, Adam H.2
Philbrick, C. Russell1
Hallen, Hans D.1
1 North Carolina State University, Department of Physics, Raleigh, NC, U.S.A.
2 Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, U.S.A.
Abstract
The magnitude of resonance Raman intensity, in terms of the real signal level measured on-resonance compared to the signal level measured off-resonance for the same sample, is investigated using a tunable laser source. Resonance Raman enhancements, occurring as the excitation energy is tuned through ultraviolet absorption lines, are used to examine the 1332 cm-1 vibrational mode of diamond and the 992 cm-1 ring-breathing mode of benzene. Competition between the wavelength dependent optical absorption and the magnitude of the resonance enhancement is studied using measured signal levels as a function of wavelength. Two system applications are identified where the resonance Raman significantly increases the real signal levels despite the presence of strong absorption: characterization of trace species in laser remote sensing and spectroscopy of the few molecules in the tiny working volumes of near-field optical microscopy.
| Citation: | "Deep ultraviolet Raman spectroscopy: A resonance-absorption trade-off illustrated by diluted liquid benzene", Chadwick, C. T., A. H. Willitsford, C. R. Philbrick, H. D. Hallen, Journal of Applied Physics, Vol. 118, American Institute of Physics (AIP), 2015, pp. 243101-1 - 243101-6, DOI: 10.1063/1.4938531, http://dx.doi.org/10.1063/1.4938531 |