Deuterium isotope effects in electronic relaxation of large polyatomic molecules. Progress report, October 1, 1974--September 30, 1975

Technical Report · Wed Jan 01 04:00:00 EST 1975

DOI:https://doi.org/10.2172/7276544· OSTI ID:7276544

Lim, E. C.

Isotope and energy dependences of radiationless decay rate, combined with energy dependence of sensitized phosphorescence in biacetyl, show that internal conversion to the ground state is generally a dominant photophysical process for molecules with large vibrational excitation. The energy dependence of decay rate gives evidence of slow vibrational relaxation (compared to electronic relaxation) for molecules with small to moderate excess energies, but vibrational relaxation faster than electronic relaxation for high vibrational relaxation. A new theoretical account of the isotope effects on radiative transitions and a theoretical analysis of the position-dependent isotope effects in radiationless transitions of aromatic molecules with non-bonding electrons have been presented.

• Research Organization: Wayne State Univ., Detroit, MI (USA)
• Sponsoring Organization: US Energy Research and Development Administration (ERDA)
• OSTI ID: 7276544
• Report Number(s): COO-2192-20
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400302* -- Organic Chemistry-- Isotope Effects-- (-1987)
AROMATICS
DE-EXCITATION
DEUTERIUM
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
LUMINESCENCE
MOLECULES
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PHOSPHORESCENCE
POLYATOMIC MOLECULES
RADIATIONLESS DECAY
STABLE ISOTOPES