Multicolor-Raman analysis of Korean paintworks: emission-like Raman collection efficiency

The Analyst ◽  
2021 ◽  
Vol 146 (7) ◽  
pp. 2374-2382
Author(s):  
Chang Hyun Bae ◽  
Si Won Song ◽  
Soo Yeong Lim ◽  
Seonyoung Yoo ◽  
Chang Sug Lee ◽  
...  
Keyword(s):  
Absorption Band ◽  
Excitation Energy ◽  
Raman Spectra ◽  
Cross Sections ◽  
Electronic Absorption ◽  
Collection Efficiency ◽  
Raman Analysis ◽  
Resonance Raman Spectra ◽  
Scattering Cross Sections ◽  
Electronic Absorption Band

It has been reported that the scattering cross-sections of resonance Raman spectra strongly depend on the resonance between the laser's excitation energy and the electronic absorption band of pigments in solution.

The 0.9 eV Absorption Band of Polyaniline: A Morphologically Sensitive Electronic Absorption

1989 ◽  
Vol 173 ◽  
Author(s):  
D. Zhang ◽  
J.-H. Hwang ◽  
S. C. Yang
Keyword(s):  
Absorption Band ◽  
Electronic Absorption ◽  
Transition Energy ◽  
Energy Levels ◽  
Electronic Energy ◽  
Emeraldine Base ◽  
Electronic Systems ◽  
Electrically Conductive ◽  
Electronic Energy Levels ◽  
Electronic Absorption Band

The optical absorption spectra of polyaniline in the visible and UV spectral regions have been characterized before. The electrically conductive form has a band gap absorption at 3.8 eV and polaron absorptions at 2.9 and 1.5 eV [1,2] . An additional electronic absorption band at 0.9 eV was found to be also related to the existence of polaron. The assignment of this transition has yet to be made. Epstein and co-workers [31 have found a photo-induced absorption band at 0.9 eV by photo-exciting emeraldine base (insulator) with 2.0 eV light. It is not known yet whether these two 0.9 eV transitions belong to the same set of electronic energy levels of polaron, or they belong to two different electronic systems but are coincidentally have the same transition energy.

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