ESR in zero field of the photoinduced triplet state in isolated reaction centers of rhodopseudomonas sphaeroides R-26 detected by the singlet ground-state absorbance

1982 ◽  
Vol 85 (3) ◽  
pp. 335-338 ◽  
Author(s):  
H.J. Den Blanken ◽  
G.P. Van Der Zwet ◽  
A.J. Hoff
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Reaction Centers ◽  
Zero Field ◽  
Singlet Ground State ◽  
Rhodopseudomonas Sphaeroides

Fluorescence-ODMR of Reaction Centers of Rhodopseudomonas viridis

1984 ◽  
Vol 39 (11-12) ◽  
pp. 1085-1090 ◽  
Author(s):  
A. Angerhofer ◽  
J. U. von Schütz ◽  
H. C. Wolf
Keyword(s):  
Triplet State ◽  
Reaction Center ◽  
Reaction Centers ◽  
Zero Field ◽  
Sign Reversal ◽  
Rhodopseudomonas Viridis ◽  
Whole Cells

Abstract Fluorescence detected ODMR measurements in zero field on the triplet state of the reaction center in whole cells of Rhodopseudomonas viridis, in reaction center solution and in reaction center crystals are reported. In solution and in the crystal a sign reversal of the F-ODMR signals is observed by variation of the wavelength of detection. The signs of the signals are interpreted with the Vredenberg-Duysens relation.

Activation energy barrier for intersystem crossing in platinum phthalocyanine

1976 ◽  
Vol 54 (6) ◽  
pp. 633-637 ◽  
Author(s):  
Tzer-Hsiang Huang ◽  
Klaus E. Rieckhoff ◽  
Eva-Maria Voigt
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Energy Barrier ◽  
Singlet State ◽  
Quantum Yields ◽  
Intersystem Crossing ◽  
Singlet Ground State ◽  
Activation Energy Barrier ◽  
Excited Singlet ◽  
Platinum Phthalocyanine

Phosphorescence quantum yields and lifetimes of platinum phthalocyanine in α-chloronaphthalene solution are reported for temperatures from 1.3 K to 300 K. Activation energies of intersystem crossing are deduced and found to be Ea = 17 ± 3 cm−1 for crossing from the first excited singlet state to the lowest lying triplet state and Eap = 8 ± 1 cm−1 for crossing from the lowest lying triplet state to the singlet ground state.

Some Recent Developments on the Synthesis, Chemical Reactivity, and Theoretical Studies of Tetroxanes

2013 ◽  
Vol 3 (1) ◽  
pp. 48-73
Author(s):  
Nelly L. Jorge ◽  
Alfonso Hernández-Laguna ◽  
Eduardo A. Castro
Keyword(s):  
Physical Chemistry ◽  
Triplet State ◽  
Critical Points ◽  
Ground State ◽  
Chemical Reactivity ◽  
Singlet Ground State ◽  
Theoretical Studies ◽  
Reaction Paths ◽  
Recent Developments

The authors present a review on some recent developments on the synthesis, chemical reactivity and theoretical studies of Tetroxanes analysing their main physical chemistry properties. The authors examine the critical points of the PES of different conformers, and reaction paths at singlet ground state and triplet state of the tetroxane, leader member of the cyclic diperoxide compound family.

Zeeman-Effekt in der Phosphoreszenz von Naphthalin-Mischkristallen

1971 ◽  
Vol 26 (9) ◽  
pp. 1425-1434
Author(s):  
D. Kilpper ◽  
M. Schowerer
Keyword(s):  
Triplet State ◽  
Field Component ◽  
Transition Probabilities ◽  
Zeeman Splitting ◽  
Radiative Transition ◽  
Zero Field ◽  
Singlet Ground State ◽  
Zero Field Splitting ◽  
The Magnetic Field ◽  
Made In

Abstract The Zeeman splitting of the phosphorescence (T1→ S0) was investigated in a mixed crystal of perdeuterated Naphthalene (N-d8) and Naphthalene (N-h8). The N-h8 concentration varied between 0.2 and 5%, the temperature was 4.2 °K and the magnetic field strength was 50 kG. The intensity of the Zeeman components is strongly dependent on the direction of the field with respect to the molecular axes. In addition to this anisotropy we observe a strong anisotropy of the lifetime of the triplet state. Both these anisotropics are due to the zero field splitting of the triplet state T1. Their analysis yields the following constants: (1) the relative radiative transition probabilities kxr, kyr and kzr from the three zero field components Tx, Ty and Tz to the singlet ground state S0 and (2) the total lifetimes tx , ty and tz of each zero field component. No assumptions concerning selection rules are made in the analysis. The results for the values of the kur (u-x, y, z) depend on the vibronic state of S0: if totally symmetric states are excited, 97% of the phosphorescence originates from the zero field component Tx . If the Δṽ= 1629 cm-1 B3g-vibration is excited the phosphorescence originates mainly from Ty and Tz . The total lifetimes of Tx , Ty and Tz are the same as measured previously in low fields by ESR.

Photoionization dynamics in CS fragmented from CS2 studied by high-resolution photoelectron spectroscopy

2004 ◽  
Vol 82 (6) ◽  
pp. 744-749
Author(s):  
Anouk M Rijs ◽  
Ellen HG Backus ◽  
Cornelis A de Lange
Keyword(s):  
High Resolution ◽  
Triplet State ◽  
Key Words ◽  
Excited States ◽  
Ground State ◽  
Photoelectron Spectroscopy ◽  
Electronic States ◽  
Reactive Intermediates ◽  
Photoelectron Spectra ◽  
Singlet Ground State

The photoionization dynamics of CS have been studied using high-resolution laser photoelectron spectroscopy. The photodissociation of CS2 at ~308 nm results in highly rotationally excited CS in its X1Σ+ singlet ground state, as well as in rotationally cold CS in the excited a3Π triplet state. The ground-state CS fragments are formed together with sulfur in its 3P, 1D, and 1S electronic states; triplet CS is produced in coincidence with ground-state sulfur (3P). In both channels the photoelectron spectra are dominated by Δv = 0 propensity, but transitions involving Δv = 1 and 2 are also observed. Key words: photoelectron spectroscopy, photoionization, photodissociation, excited states, reactive intermediates.

Correlations between the Ground State and the Triplet State Character Orders of Benzenoid Hydrocarbons

1981 ◽  
Vol 36 (6) ◽  
pp. 651-653 ◽  
Author(s):  
Chr. Bräuchle ◽  
J. Voitländer ◽  
H. Vogler
Keyword(s):  
Triplet State ◽  
Linear Correlation ◽  
Ground State ◽  
Electron Distribution ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Benzenoid Hydrocarbons ◽  
Excited Triplet ◽  
Relative Localization ◽  
The Mean

Abstract The relative localization of the n-conjugation of benzenoid hydrocarbons in the ground state So and the lowest excited triplet state Ti is described by means of character orders. For molecules with the same unmber of electron sextets a linear correlation could be found between the mean character orders of So and Ti indicating the similarities in the electron distribution of these states. The relevance of this similarity for an earlier explanation of the zero-field splitting in Ti is given

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