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  Vibronic coupling in indole: II. Experimental investigation of the ¹La-¹Lb interaction using rotationally resolved electronic spectroscopy

Küpper, J., Pratt, D. W., Meerts, W. L., Brand, C., Tatchen, J., & Schmitt, M. (2010). Vibronic coupling in indole: II. Experimental investigation of the ¹La-¹Lb interaction using rotationally resolved electronic spectroscopy. Physical Chemistry Chemical Physics, 12, 4980-4988. doi:10.1039/c001778g.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-F70B-7 Version Permalink: https://hdl.handle.net/21.11116/0000-0009-9405-A
Genre: Journal Article

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 Creators:
Küpper, Jochen1, Author           
Pratt, David. W., Author
Meerts, W. Leo, Author
Brand, Christian, Author
Tatchen, Jörg, Author
Schmitt, Michael, Author
Affiliations:
1Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              

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 Abstract: High-resolution electronic spectra of indole (C₈H₇N) and their detailed analysis are reported. Thirteen low-lying vibronic bands – from the electronic origin transition at 35231.4 cm-1 up to 1000 cm-1 above – are recorded with rotational resolution. Besides inertial parameters and inertial defects these spectra yield detailed information, for each individual band, on the transition-dipole-moment orientations in the molecular inertial frame as well as on the reorientation of that inertial frame upon electronic excitation. We also determine the natural lifetimes of the individual vibronic states. Strongly varying orientations of the transition-dipole-moments, unexpected positive inertial defects, and decreasing lifetimes, which are only partly related to increased excitation energy, are observed. These results are clear indications of the interaction of the two lowest electronically excited singlet states (¹Lb and ¹La). Our experimental findings are strongly supported by, and in excellent agreement with, the theoretical description of the interaction of the two electronic states described in the preceding paper. These results provide clear evidence for strong vibronic coupling of the two electronic states ¹Lb and ¹La and for the energetic location of the ¹La-state more than 1000 cm-1 above the ¹Lb vibrationless state.

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Language(s): eng - English
 Dates: 2010
 Publication Status: Issued
 Pages: -
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 Rev. Type: Peer
 Identifiers: eDoc: 472044
DOI: 10.1039/c001778g
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Title: Physical Chemistry Chemical Physics
  Alternative Title : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 12 Sequence Number: - Start / End Page: 4980 - 4988 Identifier: -