title: Resonant Mie scattering in infrared spectroscopy of biological materials--understanding the 'dispersion artefact'.
abstract: Infrared spectroscopic cytology is potentially a powerful clinical tool. However, in order for it to be successful, practitioners must be able to extract reliably a pure absorption spectrum from a measured spectrum that often contains many confounding factors. The most intractable problem to date is the, so called, dispersion artefact which most prominently manifests itself as a sharp decrease in absorbance on the high wavenumber side of the amide I band in the measured spectrum, exhibiting a derivative-like line shape. In this paper we use synchrotron radiation FTIR micro-spectroscopy to record spectra of mono-dispersed poly(methyl methacrylate) (PMMA) spheres of systematically varying size and demonstrate that the spectral distortions in the data can be understood in terms of resonant Mie scattering. A full understanding of this effect will enable us to develop strategies for deconvolving the scattering contribution and recovering the pure absorption spectrum, thus removing one of the last technological barriers to the development of clinical spectroscopic cytology.
authors.affiliation: School of Chemical Engineering and Analytical Science, Manchester Interdisciplinary Biocentre, The University of Manchester, 131 Princess Street, Manchester, UK M1 7DN.
authors.forename: Paul
authors.initials: P
authors.lastname: Bassan
authors.forename: Hugh J
authors.initials: HJ
authors.lastname: Byrne
authors.forename: Franck
authors.initials: F
authors.lastname: Bonnier
authors.forename: Joe
authors.initials: J
authors.lastname: Lee
authors.forename: Paul
authors.initials: P
authors.lastname: Dumas
authors.forename: Peter
authors.initials: P
authors.lastname: Gardner
mesh_terms: D016477:Artifacts; D008420:Manufactured Materials; D012542:Scattering, Radiation; D013055:Spectrophotometry, Infrared / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D019265:Spectroscopy, Near-Infrared / Q000379:methods; D013057:Spectrum Analysis; D020349:Surface Plasmon Resonance / Q000379:methods; D014961:X-Ray Diffraction