ISSN:
1089-7690
Quelle:
AIP Digital Archive
Thema:
Physik
,
Chemie und Pharmazie
Notizen:
Mercury atoms excited to the 3P1 state in rare gas and molecular (CH4, CD4, CF4, and SF6) matrices relax by a direct 3P1→1S0 fluorescence with a ca. 60 ns lifetime or by the 3P1(functional relationship)3P0 radiationless transition followed by the 3P0→1S0 long-lived (τ in the 10 to 500 ms range) emission. The main difference between atomic and molecular hosts is the appearance, in the latter case, of a well resolved vibrational structure in the spectrum of the 3P0→1S0 transition involving the frequencies of nontotally symmetric modes of the host molecules. This structure, related to a shortening of the lifetime of the 3P0→1S0 emission is explained by the intensity borrowing from the allowed 3P1→1S0 transition, i.e., by the 3P1↔3P0 mixing induced by nontotally symmetric vibrations of neighbor molecules (analog of the Herzberg–Teller effect). Relative intensities of bands corresponding to different vibrational modes may be deduced from estimation of electric fields induced in the Hg atom by displacements of electric charges of the vibrating molecule © 1997 American Institute of Physics.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.474600
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