| Autor: |
Aures, Robert, Gericke, Karl-Heinz, Maul, Christof, Trott-Kriegeskorte, Gundula, Kawasaki, Masahiro, Nakano, Yukio |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 8/1/2002, Vol. 117 Issue 5, p2141, 10p, 2 Diagrams, 2 Charts, 5 Graphs |
| Abstrakt: |
The state-resolved and isotope-specific detection of nascent C10 generated from the photodissociation of Cl[sub 2]O parent molecules is performed by observing single-color (2 + 1) resonance enhanced multiphoton ionization (REMPI) spectra following excitation in the wavelength range from 336 to 344 nm; additionally state-resolved detection of nascent Cl0 is performed by observing single-color two photon laser-induced fluorescence. The REMPI spectrum is assigned to the ClO(C² Σ[sup -],υ'=O←X²Π[sub ω], υ = 0) transition. The population of rotational states up to J = 130 is evidence of large rotational excitation induced by a strong dependence of the excited potential energy surface (PES) on the Jacobi angle γ. Formation of the ²Π[sub &frac32;] spin-orbit state is preferred: p(²Π3[sub ½]): P(²Π[sub &frac32;]) = 0.30 ± 0.05 suggesting significant radiationless transfer from the excited PES to closely lying neighboring states. The anisotropy parameter for the transition is determined to be β= 0.35 independent of the ClO quantum state. The principal excited electronic state is assigned to a ¹B[sub 2] ← ¹ A[sub 1] transition, in agreement with recent ab initio calculations. The measured β value is smaller than the limiting value of 1.0, suggesting dynamic reasons and simultaneous excitation to more than one PES. A fast and direct fragmentation process is deduced, where the upper limit for the lifetime of the excited dissociative state is calculated to be 300 fs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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