scholarly journals Revision of optical properties of solids based on the reverse Monte Carlo analysis of reflection electron energy loss spectroscopy spectra

2019 ◽  
Vol 26 (2) ◽  
pp. 128-129
Author(s):  
K. Tökési ◽  
L.H. Yang ◽  
D. Bo ◽  
Z.J. Ding
Keyword(s):  
Monte Carlo ◽  
Optical Properties ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Monte Carlo Analysis ◽  
Reverse Monte Carlo ◽  
Electron Energy Loss

Derivation of Optical Properties of Carbonaceous Aerosols by Monochromated Electron Energy-Loss Spectroscopy

2014 ◽  
Vol 20 (3) ◽  
pp. 748-759 ◽  
Author(s):  
Jiangtao Zhu ◽  
Peter A. Crozier ◽  
Peter Ercius ◽  
James R. Anderson
Keyword(s):  
Optical Properties ◽  
Energy Loss ◽  
Electron Energy ◽  
Amorphous Carbon ◽  
Electron Energy Loss Spectroscopy ◽  
Radiative Forcing ◽  
Accurate Determination ◽  
Carbonaceous Aerosols ◽  
Carbonaceous Particles ◽  
Electron Energy Loss

AbstractMonochromated electron energy-loss spectroscopy (EELS) is employed to determine the optical properties of carbonaceous aerosols from the infrared to the ultraviolet region of the spectrum. It is essential to determine their optical properties to understand their accurate contribution to radiative forcing for climate change. The influence of surface and interface plasmon effects on the accuracy of dielectric data determined from EELS is discussed. Our measurements show that the standard thin film formulation of Kramers−Kronig analysis can be employed to make accurate determination of the dielectric function for carbonaceous particles down to about 40 nm in size. The complex refractive indices of graphitic and amorphous carbon spherules found in the atmosphere were determined over the wavelength range 200–1,200 nm. The graphitic carbon was strongly absorbing black carbon, whereas the amorphous carbon shows a more weakly absorbing brown carbon profile. The EELS approach provides an important tool for exploring the variation in optical properties of atmospheric carbon.

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