ChemInform Abstract: Selenoformaldehyde: Rotational Analysis of the A1A2-X1A1 735 nm Band System of H2C78Se, H2C80Se, and D2C80Se from High-Resolution Laser Fluorescence Excitation Spectra

ChemInform ◽  
1990 ◽  
Vol 21 (40) ◽  
Author(s):  
D. J. CLOUTHIER ◽  
R. H. JUDGE ◽  
D. C. MOULE
Keyword(s):  
High Resolution ◽  
Band System ◽  
Laser Fluorescence ◽  
Rotational Analysis ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra

High-resolution fluorescence excitation spectra of jet-cooled benzyl and p-methylbenzyl radicals

1992 ◽  
Vol 167 (1-2) ◽  
pp. 203-214 ◽  
Author(s):  
Tai-Yuan David Lin ◽  
Xue-Qing Tan ◽  
Timothy M. Cerny ◽  
James M. Williamson ◽  
David W. Cullin ◽  
...  
Keyword(s):  
High Resolution ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra

Laser fluorescence excitation spectra of the AlNC and AlCN isomers

1999 ◽  
Vol 110 (1) ◽  
pp. 220-228 ◽  
Author(s):  
Irina Gerasimov ◽  
Xin Yang ◽  
Paul J. Dagdigian
Keyword(s):  
Laser Fluorescence ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra

scholarly journals Asymmetry in the Qy Fluorescence and Absorption Spectra of Chlorophyll a Pertaining to Exciton Dynamics

2020 ◽  
Vol 8 ◽  
Author(s):  
Jeffrey R. Reimers ◽  
Margus Rätsep ◽  
Arvi Freiberg
Keyword(s):  
High Resolution ◽  
Chlorophyll A ◽  
Absorption Spectra ◽  
Magnetic Circular Dichroism ◽  
Photochemical Reactions ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Transport Dynamics ◽  
Exciton Transport ◽  
Fluorescence Excitation Spectra

Significant asymmetry found between the high-resolution Qy emission and absorption spectra of chlorophyll-a is herein explained, providing basic information needed to understand photosynthetic exciton transport and photochemical reactions. The Qy spectral asymmetry in chlorophyll has previously been masked by interference in absorption from the nearby Qx transition, but this effect has recently been removed using extensive quantum spectral simulations or else by analytical inversion of absorption and magnetic circular dichroism data, allowing high-resolution absorption information to be accurately determined from fluorescence-excitation spectra. To compliment this, here, we measure and thoroughly analyze the high-resolution differential fluorescence line narrowing spectra of chlorophyll-a in trimethylamine and in 1-propanol. The results show that vibrational frequencies often change little between absorption and emission, yet large changes in line intensities are found, this effect also being strongly solvent dependent. Among other effects, the analysis in terms of four basic patterns of Duschinsky-rotation matrix elements, obtained using CAM-B3LYP calculations, predicts that a chlorophyll-a molecule excited into a specific vibrational level, may, without phase loss or energy relaxation, reemit the light over a spectral bandwidth exceeding 1,000 cm−1 (0.13 eV) to influence exciton-transport dynamics.

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