Anisotropic Intersystem Crossing from the Upper Excited Triplet States of Anthracenes: Two-laser Time-Resolved EPR Study

1999 ◽  
Vol 103 (12) ◽  
pp. 1714-1718 ◽  
Author(s):  
Yoshiyuki Kamata ◽  
Kimio Akiyama ◽  
Shozo Tero-Kubota
Keyword(s):  
Intersystem Crossing ◽  
Triplet States ◽  
Time Resolved ◽  
Excited Triplet ◽  
Excited Triplet States

Time-resolved ESR studies on the excited triplet states and photoenolization of 2-methylacetophenone and related molecules

1989 ◽  
Vol 93 (20) ◽  
pp. 7087-7091 ◽  
Author(s):  
Tadaaki Ikoma ◽  
Kimio Akiyama ◽  
Shozo Tero-Kubota ◽  
Yusaku Ikegami
Keyword(s):  
Triplet States ◽  
Time Resolved ◽  
Excited Triplet ◽  
Excited Triplet States

Time-resolved EPR and ODMR studies on the lowest excited triplet states of α-silyl and α-germyl ketones

2001 ◽  
Vol 99 (14) ◽  
pp. 1183-1192 ◽  
Author(s):  
ISLAM S. M. SAIFUL ◽  
MINORU HANAYA ◽  
MASAMOTO IWAIZUMI ◽  
MASANOBU WAKASA ◽  
KUNIO MOCHIDA ◽  
...  
Keyword(s):  
Triplet States ◽  
Time Resolved ◽  
Excited Triplet ◽  
Excited Triplet States

Time-resolved and conventional ESR studies of the excited triplet states of dibenzotetraazamacrocyclic complexes of Al(III) and Ge(IV)

1986 ◽  
Vol 131 (4-5) ◽  
pp. 430-434 ◽  
Author(s):  
Shozo Tero-Kubota ◽  
Hiroki Oshio ◽  
Tasuku Ito ◽  
Virgil L. Goedken ◽  
Jiro Higuchi
Keyword(s):  
Triplet States ◽  
Time Resolved ◽  
Excited Triplet ◽  
Excited Triplet States

Monitoring the Formation and Decay of Transient Photosensitized Intermediates Using Pump-Probe UV Resonance Raman Spectroscopy. I: Self-Modeling Curve Resolution

2003 ◽  
Vol 57 (4) ◽  
pp. 439-447 ◽  
Author(s):  
James A. Kleimeyer ◽  
Joel M. Harris
Keyword(s):  
Factor Analysis ◽  
Excited State ◽  
Ground State ◽  
Pure Component ◽  
Triplet States ◽  
Time Resolved ◽  
Pump Probe ◽  
Excited Triplet ◽  
Curve Resolution ◽  
Excited Triplet States

Resolution of transient excited-state Raman scattering from ground-state and solvent bands is a challenging spectroscopic measurement since excited-state spectral features are often of low intensity, overlapping the dominant ground-state and solvent bands. The Raman spectra of these intermediates can be resolved, however, by acquiring time-resolved data and using multidimensional data analysis methods. In the absence of a physical model describing the kinetic behavior of a reaction, resolution of the pure-component spectra from these data can be accomplished using self-modeling curve resolution, a factor analysis technique that relies on the correlation in the data along a changing composition dimension to resolve the component spectra. A two-laser UV pump-probe resonance-enhanced Raman instrument was utilized to monitor the kinetics of amine quenching of excited-triplet states of benzophenone. The formation and decay of transient intermediates were monitored over time, from 15 ns to 100 μs. Factor analysis of the time-resolved spectral data identified three significant components in the data. The time-resolved intensities at each Raman wavenumber shift were projected onto the three significant eigenvectors, and least-squares criteria were developed to find the common plane in the space of the eigenvectors that includes the observed data. Within that plane, the three pure-component spectra were resolved using geometric criteria of convex hull analysis. The resolved spectra were found to arise from benzophenone excited-triplet states, diphenylketyl radicals, and the solvent and ground-state benzophenone.

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