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Issue 6, 2015
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Laser-induced fluorescence of free diamondoid molecules

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Abstract

We observe the fluorescence of pristine diamondoids in the gas phase, excited using narrow band ultraviolet laser light. The emission spectra show well-defined features, which can be attributed to transitions from the excited electronic state into different vibrational modes of the electronic ground state. We assign the normal modes responsible for the vibrational bands, and determine the geometry of the excited states. Calculations indicate that for large diamondoids, the spectral bands do not result from progressions of single modes, but rather from combination bands composed of a large number of Δv = 1 transitions. The vibrational modes determining the spectral envelope can mainly be assigned to wagging and twisting modes of the surface atoms. We conclude that our theoretical approach accurately describes the photophysics in diamondoids and possibly other hydrocarbons in general.

Graphical abstract: Laser-induced fluorescence of free diamondoid molecules

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Article information


Submitted
30 Sep 2014
Accepted
30 Dec 2014
First published
07 Jan 2015

Phys. Chem. Chem. Phys., 2015,17, 4739-4749
Article type
Paper
Author version available

Laser-induced fluorescence of free diamondoid molecules

R. Richter, M. I. S. Röhr, T. Zimmermann, J. Petersen, C. Heidrich, R. Rahner, T. Möller, J. E. Dahl, R. M. K. Carlson, R. Mitric, T. Rander and A. Merli, Phys. Chem. Chem. Phys., 2015, 17, 4739
DOI: 10.1039/C4CP04423A

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