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On the Mechanism of Magnetic Quenching of Fluorescence in Gaseous State
Author(s) -
Matsuzaki A.,
Nagakura S.
Publication year - 1978
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19780610215
Subject(s) - chemistry , zeeman effect , quenching (fluorescence) , magnetic field , glyoxal , atomic physics , intramolecular force , fluorescence , reaction rate constant , hamiltonian (control theory) , kinetics , physics , quantum mechanics , stereochemistry , mathematical optimization , mathematics , organic chemistry
Abstract The pressure dependence of fluorescence quenching of gaseous glyoxal has been measured in the presence of a magnetic field of 1–8 kG. Below 5 kG both the collision free lifetime and the collisional quenching constant were found to be dependent upon magnetic field strength. Above 5 kG the Collisional quenching constant turned out to be nearly equal to the value without magnetic field and the collision free lifetime took a constant value larger than that without magnetic field. The magnetic enhancement of the intramolecular radiationless transition of gaseous molecules has been studied theoretically. The phenomenon is shown to be explained by considering two mechanisms, mechanisms I and II. Mechanism I is due to the interaction of a primary state with secondary states through the Zeeman hamiltonian. Mechanism II is due to the shift and broadening of appropriate rovibronic levels by the Zeeman effect.