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>Resonant multiphoton ionization photoelectron spectroscopic study of benzene. Evidence for fast intramolecular vibrational relaxation within the1E1ustate
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Resonant multiphoton ionization photoelectron spectroscopic study of benzene. Evidence for fast intramolecular vibrational relaxation within the1E1ustate
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机译：Resonant multiphoton ionization photoelectron spectroscopic study of benzene. Evidence for fast intramolecular vibrational relaxation within the1E1ustate
Resonant multiphoton ionization photoelectron measurements were carried out for benzene under collisionhyphen;free conditions in such a way that the benzene molecule is ionized by four photons through various twohyphen;photon allowed vibronic levels of the1B2uexcited state. As a result, single prominent, somewhat broad photoelectron bands were observed in the 0.14ndash;0.36 eV region, arising from Dgr;v=0 ionization transitions. The prominent peak is shifted with increasing photon energy byK=hngr;lminus;C, whereKis the photoelectron energy,hngr;lthe photon energy, andCa constant. This relationship strongly indicates that the third photon is resonant with a real intermediate excited state. Therefore, the overall ionization process is expressed by (2+1+1). It is concluded that fast intramolecular vibrational relaxation occurs at the thirdhyphen;photon states within the1Elu(pgr;pgr;ast;) state and subsequent ionization takes place from vibrationally relaxed levels. The relaxation within the1Elustate is supported from the 0ndash;0 energy which was evaluated here for the ionized states from the photoelectron data. It is also suggested that the lifetime of the vibrationally relaxed1Elustates is the order of 10minus;11ndash;10minus;12s or longer.
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