TITLE

Fine structure of the (S1←S0) band origins of phthalocyanine molecules in helium droplets

AUTHOR(S)
Lehnig, Rudolf; Slipchenko, Mikhail; Kuma, Susumu; Momose, Takamasa; Sartakov, Boris; Vilesov, Andrey
PUB. DATE
November 2004
SOURCE
Journal of Chemical Physics;11/15/2004, Vol. 121 Issue 19, p9396
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The laser-induced fluorescence (LIF) excitation spectra of free base phthalocyanine (Pc), Mg-Pc, and Zn-Pc molecules in superfluid helium droplets at T=0.38 K have been studied. The spectra reveal the rich vibronic structure of the S1←S0 electronic transitions. The band origins of the transitions consist of zero phonon lines accompanied by phonon wings, which originate from simultaneous electronic excitation of the molecule and excitation of the collective modes of the helium surrounding it. The phonon wings have discrete structures suggesting localization of some helium atoms in the neighborhood of the molecules. Zero phonon lines of Mg-Pc and Zn-Pc molecules are split into three components, which are separated by 0.2–0.4 cm-1. Possible mechanism of splitting involves static or dynamic Jahn–Teller interaction of metal-phthalocyanine molecules in the twofold degenerate S1(1Eu) state with the helium shell. © 2004 American Institute of Physics.
ACCESSION #
14945579

 

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