scholarly journals Photoionization of Excimers Produced in Naphthalene Clusters

1994 ◽  
Vol 13 (3-4) ◽  
pp. 241-257 ◽  
Author(s):  
Hiroyuki Saigusa
Keyword(s):  
Direct Evidence ◽  
Selective Excitation ◽  
Ionization Mechanism ◽  
Pump Probe ◽  
Factors Associated ◽  
Structural Isomerization ◽  
Condon Factors ◽  
Aromatic Clusters ◽  
Excimer Formation ◽  
Franck Condon

The excited-state dynamics of small naphthalene clusters that occur upon selective excitation into S1 vibronic levels have been investigated by mass-selective pump-probe photoionization spectroscopy. The results provide direct evidence for structural isomerization of the initially excited van der Waals cluster into an excimer geometry, consistent with the fluorescence results. The excimer has been identified as a cluster having a strongly bound dimer core surrounded by ground-state molecules, thus ruling out the possibility of excimer formation via monomer evaporation. We have also found that ionization is enhanced when the initially excited cluster undergoes excimer formation, which provides a new ionization mechanism for aromatic clusters. The ionization enhancement is explained by the Franck–Condon factors associated with the ionizing transition from the excimer state.

Identification of the photoelectron spectra of HFCS via computing Franck–Condon factors

2021 ◽  
pp. 113393
Author(s):  
Jia-Lin Chang ◽  
Wen-Hsin Kuo ◽  
Yun-Jhu Huang ◽  
Mu-Fong Chang ◽  
Jui-Yang Huang ◽  
...  
Keyword(s):  
Photoelectron Spectra ◽  
Condon Factors ◽  
Franck Condon

THEORETICAL TRANSITION PROBABILITIES FOR THE $\tilde{A}^{2}A_{1} -\tilde{X}^{2}B_{1}$ SYSTEM OF H2O+ AND D2O+ AND RELATED FRANCK–CONDON FACTORS BASED ON GLOBAL POTENTIAL ENERGY SURFACES

2005 ◽  
Vol 04 (01) ◽  
pp. 225-245 ◽  
Author(s):  
IKUO TOKUE ◽  
KATSUYOSHI YAMASAKI ◽  
SATOSHI MINAMINO ◽  
SHINKOH NANBU
Keyword(s):  
Potential Energy ◽  
Photoelectron Spectroscopy ◽  
Potential Energy Surfaces ◽  
Least Squares Method ◽  
Transition Probabilities ◽  
Three Dimensional ◽  
Equilibrium Geometry ◽  
Condon Factors ◽  
Energy Surfaces ◽  
Franck Condon

To elucidate the ionization dynamics, in particular the vibrational distribution, of H 2 O +(Ã) produced by photoionization and the Penning ionization of H 2 O and D 2 O with He *(2 3S) atoms, Franck–Condon factors (FCFs) were given for the [Formula: see text] ionization, and the transition probabilities were presented for the [Formula: see text] emission. The FCFs were obtained by quantum vibrational calculations using the three-dimensional potential energy surfaces (PESs) of [Formula: see text] and [Formula: see text] electronic states. The global PESs were determined by the multi-reference configuration interaction calculations with the Davidson correction and the interpolant moving least squares method combined with the Shepard interpolation. The obtained FCFs exhibit that the [Formula: see text] state primarily populates the vibrational ground state, as its equilibrium geometry is almost equal to that of [Formula: see text], while the bending mode (ν2) is strongly enhanced for the H 2 O +(Ã) state; the maximums in the population of H 2 O + and D 2 O + are approximately v2 = 11–12 and 15–17, respectively. These results are consistent with the distributions observed by photoelectron spectroscopy. Transition probabilities for the [Formula: see text] system of H 2 O + and D 2 O + show that the bending progressions consist primarily of the [Formula: see text] emission, with combination bands from the (1, v′2 = 4–8, 0) level being next most important.

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