Atomic Rayleigh scattering cross-sections and the associated anomalous dispersion in the X-ray regions

1999 ◽  
Vol 7 (1) ◽  
pp. 45-53 ◽  
Author(s):  
D.V. Rao ◽  
R. Cesareo ◽  
G.E. Gigante
Keyword(s):  
Cross Sections ◽  
Rayleigh Scattering ◽  
Anomalous Dispersion ◽  
X Ray ◽  
Scattering Cross ◽  
Scattering Cross Sections

scholarly journals Scattering and Absorption Cross-sections of Atmospheric Gases in the Ultraviolet-Visible Wavelength Range (307–725 nm)

2020 ◽  
Author(s):  
Quanfu He ◽  
Zheng Fang ◽  
Ofir Shoshamin ◽  
Steven S. Brown ◽  
Yinon Rudich
Keyword(s):  
Refractive Index ◽  
Wavelength Range ◽  
Cross Sections ◽  
Rayleigh Scattering ◽  
Dispersion Relations ◽  
Optical Absorption Spectroscopy ◽  
Absorption Cross ◽  
Atmospheric Gases ◽  
Scattering Cross ◽  
Scattering Cross Sections

Abstract. Accurate Rayleigh scattering and absorption cross-sections of atmospheric gases are essential for understanding the propagation of electromagnetic radiation in planetary atmospheres. Accurate extinction cross-sections are also essential for calibrating high finesse optical cavities and differential optical absorption spectroscopy and for accurate remote sensing. In this study, we measured the scattering and absorption cross-sections of carbon dioxide, nitrous oxide, sulfur hexafluoride, oxygen, and methane in the continuous wavelength range of 307–725 nm using Broadband Cavity Enhanced Spectroscopy (BBCES). The experimentally derived Rayleigh scattering cross-sections for CO2, N2O, SF6, O2, and CH4 agree with refractive index-based calculations, with a difference of 1.5 % and 1.1 %, 1.5 %, 2.9 %, and 1.4 % on average, respectively. The O2-O2 collision-induced absorption and absorption by methane are obtained with high precision at the 0.8 nm resolution of our BBCES instrument in the 307–725 nm wavelength range. New dispersion relations for N2O, SF6, and CH4 were derived using data in the UV-vis wavelength range. This study provides improved refractive index dispersion relations, n-based Rayleigh scattering cross-sections, and absorption cross-sections for these gases.

X-RAY SCATTERING CROSS SECTIONS FOR MOLECULES, PLASTICS, TISSUES, AND FEW BIOLOGICAL MATERIALS

2002 ◽  
Vol 20 (3) ◽  
pp. 327-361 ◽  
Author(s):  
D. V. Rao ◽  
T. Takeda ◽  
Y. Itai ◽  
T. Akatsuka ◽  
R. Cesareo ◽  
...  
Keyword(s):  
Cross Sections ◽  
Biological Materials ◽  
X Ray ◽  
Scattering Cross ◽  
X Ray Scattering ◽  
Scattering Cross Sections ◽  
Ray Scattering
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