Optical and electron paramagnetic resonance studies of the excited triplet states of UV-B absorbers: 2-ethylhexyl salicylate and homomenthyl salicylate

2015 ◽  
Vol 14 (9) ◽  
pp. 1651-1659 ◽  
Author(s):  
Kazuto Sugiyama ◽  
Takumi Tsuchiya ◽  
Azusa Kikuchi ◽  
Mikio Yagi
Keyword(s):  
Hydrogen Bond ◽  
Electron Paramagnetic Resonance ◽  
Bond Formation ◽  
Intermolecular Hydrogen Bond ◽  
Triplet States ◽  
Paramagnetic Resonance ◽  
Hydrogen Bond Formation ◽  
Excited Triplet ◽  
Electron Paramagnetic ◽  
Excited Triplet States

UV-B absorbers, 2-ethylhexyl salicylate and homomenthyl salicylate, show a photoinduced phosphorescence enhancement, which originates from the photoinduced intermolecular hydrogen-bond formation.

Divacancy Model for P6/P7 Centers in 4H- and 6H-SiC

2006 ◽  
Vol 527-529 ◽  
pp. 527-530 ◽  
Author(s):  
Nguyen Tien Son ◽  
T. Umeda ◽  
Junichi Isoya ◽  
Adam Gali ◽  
M. Bockstedte ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Ab Initio ◽  
Positive Charge ◽  
Triplet States ◽  
Double Positive ◽  
Paramagnetic Resonance ◽  
Excited Triplet ◽  
Electron Paramagnetic ◽  
Excited Triplet States ◽  
Good Agreement

Electron paramagnetic resonance (EPR) studies of the P6/P7 centers in 4H- and 6H-SiC are reported. The obtained principal values of the hyperfine tensors of C and Si neighbors are in good agreement with the values of the neutral divacancy (VCVSi 0) calculated by ab initio supercell calculations. The results suggest that the P6/P7 centers, which were previously assigned to the photo-excited triplet states of the carbon vacancy-carbon antisite pairs in the double positive charge state (VCCSi 2+), are related to the triplet ground states of the C3v/C1h configurations of VCVSi 0.

Sign in / Sign up

Export Citation Format

Share Document