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Interaction of T 1 and S 1 States of h 4 ‐ and d 4 ‐Acetaldehyde Using a Quantum‐Beat Technique
Author(s) -
Hsu TsingJung,
Lee ShihHuang,
Tang KuoChun,
Chen IChia
Publication year - 1998
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199800076
Subject(s) - chemistry , acetaldehyde , quantum , beat (acoustics) , quantum mechanics , organic chemistry , physics , ethanol
Abstract Decays of fluorescence of h 4 ‐ and d 4 ‐acetaldehyde are measured. The quantum‐beat structure is observed for both isotopic species. This oscillatory phenomenon is due to interaction of the state S 1 (Ã′ A″) and T 1 . Below the dissociation threshold to form products methyl and formyl radicals, an upper limit of a lifetime is set at 195‐800 ns for perturbed triplet states of CD 3 CDO; the lifetime is calculated directly from the linewidth of Fourier‐transformed spectra. At excitation wavelength shorter than 316.12 nm, the transformed linewidth increases, indicating the onset of CD 3 + DCO formation.