Ionization from a double bond: Rovibronic photoionization dynamics of ethylene, large amplitude torsional motion and vibronic coupling in the ground state of C2H4+

2004 ◽  
Vol 120 (4) ◽  
pp. 1761-1774 ◽  
Author(s):  
S. Willitsch ◽  
U. Hollenstein ◽  
F. Merkt
Keyword(s):  
Double Bond ◽  
Ground State ◽  
Large Amplitude ◽  
Vibronic Coupling ◽  
Torsional Motion

Vibronische Kopplung und dynamisch verzerrte Strukturen in Hexahalogenotelluraten(IV): Ergebnisse aus Tieftemperatur-Röntgenbeugungsuntersuchungen (300—160 K) und aus FTIR-spektroskopischen Experimenten (300—5 K) [1] / Vibronic Coupling and Dynamically Distorted Structures in Hexahalogenotellurates(IV): Low Temperatur X-Ray Diffraction (300—160 K) and FTIR-Spectroscopic (300—5 K) Results [1]

1987 ◽  
Vol 42 (10) ◽  
pp. 1273-1281 ◽  
Author(s):  
Walter Abriel ◽  
Ernst-Jürgen Zehnder
Keyword(s):  
Ground State ◽  
Low Temperatures ◽  
Potential Surface ◽  
Energy Gap ◽  
Vibronic Coupling ◽  
High Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Excited State ◽  
Theoretical Considerations

AbstractFrom theoretical considerations a dynamically distorted octahedron as a result of vibronic coupling between the ground state and the first excited state should exist for 14 electron AX6E systems like TeX62- . A high symmetry crystal field yielding at least a center of symmetry for the Te position stabilizes this fluctuating structure, otherwise statical distortion will be observed. From X-ray diffraction experiments on antifluorite type compounds A2TeX6 (A = Rb. Cs: X = Cl, Br) the averaged structure (m3̅m symmetry) of the anions was found even at very low temperatures. The thermal parameters are not significantly different from those of similar SnX62 compounds. Distortions therefore are very small and are evident from FTIR spectroscopic meas­urements only. Here very broad T1u-deformation vibration bands are observed down to tempera­tures <10 K without splitting: Astatically distorted species could not be frozen out. In contrast to XeF6 for TeX62- the energy gap between the threefold, fourfold or sixfold minima of the potential surface (according to the symmetry of one component of the T1u-vibration) is very small and shifted to temperatures lower than reached with the devices used for these experiments.

ON THE PREFORMATION FACTORS IN ALPHA DECAY

1993 ◽  
Vol 02 (04) ◽  
pp. 855-872 ◽  
Author(s):  
A. LUDU ◽  
W. GREINER ◽  
A. SANDULESCU
Keyword(s):  
Total Energy ◽  
Alpha Particle ◽  
Ground State ◽  
Large Amplitude ◽  
Collective Motion ◽  
Alpha Decay ◽  
Nuclear Surface ◽  
Particle Cluster ◽  
Shell Effects ◽  
Nonlinear Hydrodynamics

Alpha decay is described as a new large amplitude collective motion in nuclei. The total energy is evaluated in the frame of the nonlinear hydrodynamics approach which leads to the formation of solitons on the nuclear surface. A new minimum appears in the total energy due to the shell effects for 208 Pb and 4 He introduced phenomenologically. The minimum was chosen to be degenerate with the ground state minimum. Consequently a new coexistence model consisting of the usual shell model and an alpha particle cluster-like model describing a soliton moving on the nuclear surface is obtained. The corresponding amplitudes describe excellently the experimental preformation factors for alpha decay of Po isotopes.

Ground-State, Mode-Dependent Vibronic Coupling in Some Simple, Cyanide-Bridged Transition-Metal Donor−Acceptor Complexes

1999 ◽  
Vol 38 (22) ◽  
pp. 5091-5101 ◽  
Author(s):  
Ariel V. Macatangay ◽  
Selma Elaine Mazzetto ◽  
John F. Endicott
Keyword(s):  
Transition Metal ◽  
Ground State ◽  
Vibronic Coupling ◽  
Donor Acceptor

Electronic spectra of tolan in a supersonic free jet: large-amplitude torsional motion

1984 ◽  
Vol 88 (9) ◽  
pp. 1711-1716 ◽  
Author(s):  
Katsuhiko Okuyama ◽  
Takahumi Hasegawa ◽  
Mitsuo Ito ◽  
Naohiko Mikami
Keyword(s):  
Electronic Spectra ◽  
Large Amplitude ◽  
Torsional Motion ◽  
Free Jet

Vibronic Coupling in the Ground State of Oligoacene Cations: The Performance of Range-Separated Hybrid Density Functionals

2013 ◽  
Vol 118 (1) ◽  
pp. 154-158 ◽  
Author(s):  
Cai-Rong Zhang ◽  
Veaceslav Coropceanu ◽  
John S. Sears ◽  
Jean-Luc Brédas
Keyword(s):  
Ground State ◽  
Vibronic Coupling ◽  
Density Functionals
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