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Rotation–tunneling analysis of the origin band in the tropolone pi*<--pi absorption system

J. Chem. Phys. 120, 4638 (2004); doi:10.1063/1.1645774

Issue Date: 8 March 2004

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Alfredo E. Bracamonte and Patrick H. Vaccaro
Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107
The tunneling-split origin band of the tropolone à 1B2–X-tilde 1A1 (pi*<--pi) absorption system was interrogated under ambient, bulk-gas conditions by exploiting high-resolution degenerate four-wave mixing techniques. The inherent complexity of this spectral region was alleviated by performing polarization-resolved measurements, with judicious selection of transverse characteristics for the incident and detected electromagnetic fields enabling rovibronic transitions to be discriminated according to their attendant changes in rotational angular momentum, DeltaJ. Quantitative simulation of recorded data sets showed the vibrationless level of the electronically excited state to be bifurcated by Delta<sub>0</sub><sup>[A-tilde]</sup> = 19.846(25) cm–1, representing a factor of 20 increase in proton-transfer efficiency over the corresponding level of the ground electronic state. Spectroscopic parameters extracted for the 0+ and 0– manifolds of à 1B2 tropolone yield unexpectedly large values of the inertial defect, DeltaI<sub>0[sup +]</sub><sup>[A-tilde]</sup> = –0.802(86) amu Å2 and DeltaI<sub>0[sup -]</sub><sup>[A-tilde]</sup> = –0.882(89) amu Å2, strongly suggesting that a loss of molecular planarity accompanies the pi*<--pi electron promotion. These results, as well as complementary information deduced for interloping hot-band resonances, are discussed in terms of the unique structural and dynamical properties exhibited by tropolone and related proton-transfer species. ©2004 American Institute of Physics.
History: Received 13 November 2003; accepted 11 December 2003
Permalink: http://link.aip.org/link/?JCPSA6/120/4638/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.20.Wr
    Vibronic, rovibronic, and rotation-electron-spin interactions (molecular spectra)
  • 33.20.Vq
    Vibration-rotation analysis (molecular spectra)
  • 31.90.+s
    Other topics in the theory of the electronic structure of atoms and molecules (restricted to new topics in section 31)
  • 42.65.Hw
    Optical phase conjugation; photorefractive and Kerr effects
  • YEAR: 2004

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0021-9606 (print)   1089-7690 (online)
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