title: A new method for estimating the extinction efficiency of polystyrene microsphere by micro-FTIR spectroscopy.
abstract: The IR spectra of a single, isolated polystyrene sphere with diameter of 4.46μm under different aperture sizes have been measured by Micro-FTIR spectrometer and the scattering signal can be seen obviously. Based on Mie scattering theory, a feasible method has been proposed to estimate the extinction efficiency (Qext) of microsphere. Qextfrom Mid-IR spectroscopy is consistent well with that derived from MiePlot software. It shows that the extinction efficiency of microsphere with the size of the Mid-IR range (2.5μm-25μm), which exhibits weak IR absorption, can be obtained by using the present method based on recorded Micro-FTIR spectra.
authors.affiliation: The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China. Electronic address: sfpang@bit.edu.cn.
authors.forename: Shu-Feng
authors.initials: SF
authors.lastname: Pang
authors.affiliation: The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Chun-Bo
authors.initials: CB
authors.lastname: Leng
authors.affiliation: The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China. Electronic address: yhz@bit.edu.cn.
authors.forename: Yun-Hong
authors.initials: YH
authors.lastname: Zhang
keywords: Aperture; Extinction efficiency (Q(ext)); Micro-FTIR; Microsphere; Mie scattering