Optical Properties and Dynamics of Molecular Excitons in Oligothiophenes

1995 ◽  
Vol 413 ◽  
Author(s):  
R. Tubino ◽  
G. Bongiovanni ◽  
A. Mura ◽  
R. Bosisio ◽  
C. Botfa ◽  
...  
Keyword(s):  
Experimental Data ◽  
Optical Properties ◽  
Solid State ◽  
Inclusion Compound ◽  
Electronic States ◽  
Emission Spectra ◽  
Excited Electronic States ◽  
Exciton Model ◽  
Time Resolved ◽  
Molecular Excitons

ABSTRACTCW absorption and emission spectra as well as time-resolved photoemission dynamics have been employed to detect the evolution of the first excited electronic states and the associated spectroscopical changes in passing from the isolated molecules to the aggregated state in thiophene oligomers. To this end a novel form of inclusion compound in PHTP in which the molecules are electronically decoupled in the solid state has been studied, thus avoiding the complications associated with the change in conformation occurring upon dissolution. The experimental data are interpreted in terms of the molecular exciton model.

scholarly journals Determination of Excited State Molecular Structures from Time-Resolved Gas-Phase X-Ray Scattering

2020 ◽  
Author(s):  
Haiwang Yong ◽  
Andrés Moreno Carrascosa ◽  
Lingyu Ma ◽  
Brian Stankus ◽  
Michael P Minitti ◽  
...  
Keyword(s):  
Excited State ◽  
Gas Phase ◽  
Electronic States ◽  
Molecular Structures ◽  
Excited Electronic States ◽  
Comprehensive Investigation ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering

We present a comprehensive investigation of a recently introduced method to determine transient structures of molecules in excited electronic states with sub-Ångstrom resolution from time-resolved gas-phase scattering signals. The method,...

The Thermal Emission of Iodine

1974 ◽  
Vol 52 (19) ◽  
pp. 1862-1871
Author(s):  
J. David Brown ◽  
George Burns
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Temperature Dependence ◽  
Electronic State ◽  
Reasonable Agreement ◽  
Thermal Emission ◽  
Electronic States ◽  
Excited Electronic States ◽  
Calculated Temperature ◽  
Calculated Temperature Dependence

The temperature dependence of emission from iodine, heated in a shock wave to 1000 K–2000 K, has been measured at 4550, 5550, 6950, 7550, and 7820 Å. Preliminary measurements of the emission at 6380 Å were also made. The temperature dependence of the emission was calculated at these wavelengths for transitions to the ground electronic state X(1Σg+) of iodine from the excited electronic states, A(3Π1u), (1Π1u), and [Formula: see text]. The calculated results are in a reasonable agreement with experimental data. For the banded emission due to the B → X transition, a theory of the temperature dependence of emission was developed. At 6950, 7550, and 7820 Å, the results of this theory agree with the experimental data thus identifying the B → X transition as the source of emission at these wavelengths. The temperature dependence of emission at 4550 Å is consistent with calculated temperature dependence for either (1Π1u) → X or [Formula: see text] transitions. The temperature dependence of the emission at 5550 Å is consistent with calculated temperature dependence for the above two transitions, as well as for the A(3Π1u) → X transition.

General discussion: electronic emission spectroscopy of CF+4 and SiF+4

1988 ◽  
Vol 324 (1578) ◽  
pp. 289-293 ◽  
Keyword(s):  
Emission Spectroscopy ◽  
Molecular Beam ◽  
Rotational Temperature ◽  
Electronic States ◽  
Emission Spectra ◽  
Fluorescence Decay ◽  
Molecular Ions ◽  
Dissociation Channel ◽  
Excited Electronic States ◽  
Beam Electron

We report the observation of electronic emission spectra in the tetrahedral molecular ions CF+4 and SiF+4. The spectra are observed at a low rotational temperature (less than 30 K) in a crossed molecular-beam - electron-beam apparatus (Carrington & Tuckett 1980). These spectra are especially interesting because the fluorescing states in the two ions lie up to 10 eV above their lowest dissociation channel (to CF+3/SiF+3 + F; see figure 1), and these states might be expected to decay non-radiatively rather than by a radiative channel. The observation of fluorescence decay from highly excited electronic states of these polyatomic ions is therefore a very surprising phenomenon.

Electronic Spectra of Single-Crystal Maleonitriledithiolate Complexes of Iridium (I): [Ir(CO)2mnt] TBA (mnt ≡ [S2C2(CN)2]2-; TBA ≡ [(C4H9)4N] + )

1989 ◽  
Vol 44 (11) ◽  
pp. 1057-1062
Author(s):  
U. Riedl ◽  
G. Gliemann
Keyword(s):  
Charge Transfer ◽  
Magnetic Fields ◽  
Optical Absorption ◽  
Single Crystal ◽  
Electronic Spectra ◽  
Electronic States ◽  
Emission Spectra ◽  
Spin Orbit ◽  
Excited Electronic States ◽  
Decay Times

The polarized optical absorption and emission (spectra, decay times) of single-crystal [lr(CO)2mnt] TBA at temperatures 2 K≦T≤295 K and homogeneous magnetic fields O≦H≦6T are reported. The highly resolved spectra show 0-0 transitions with vibrational satellites and phonon side bands. Applied magnetic fields yield no effect on the emission. The lowest excited electronic states can be assigned to the spin-orbit components A′1 B′1 and B′1 of the charge transfer triplet 3A2 (symmetry C2v)

Time-resolved spontaneous and coherent raman scattering of Ni-octaethylporphyrin in excited electronic states

1988 ◽  
Vol 144 (1) ◽  
pp. 90-95 ◽  
Author(s):  
A.Yu. Chikishev ◽  
V.F. Kamalov ◽  
N.I. Koroteev ◽  
V.V. Kvach ◽  
A.P. Shkurinov ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Electronic States ◽  
Excited Electronic States ◽  
Time Resolved ◽  
Coherent Raman Scattering ◽  
Coherent Raman
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