Electronic photon echo spectroscopy and vibrations

Summary, in English

Coupling between electronic and nuclear degrees of freedom in Rhodamine 800 has been studied using fluorescence line narrowing (FLN) and three-pulse photon echo peak shift (3PEPS). From the FLN measurement we extract the Huang-Rhys S-factors and frequencies of 16 Franck-Condon active vibrations clustered in two groups centred around 350 cm(-1) and 1400 cm(-1). The five modes below 500 cm(-1) covered by the excitation pulse spectral band create a complex beating pattern in the 3PEPS measurements. After determining the reorganisation energy of the modes involved in the peak shift measurement we are able to obtain the S-factors of the modes. The S-factors from two different experiments are in good agreement. The dephasing rates of these vibrations deviate significantly from the band-gap law. We propose that the main channel for the dephasing of the modes above 225 cm(-1) is a second order process involving one phonon and a molecular vibration. (C) 2010 Elsevier B.V. All rights reserved.

• Author: Niklas Christensson; B. Dietzek; Arkady Yartsev; Tönu Pullerits
• Department/s: Chemical Physics
• Publishing year: 2010
• Language: English
• Pages: 2-5
• Publication/Series: Vibrational Spectroscopy
• Volume: 53
• Issue: 1
• Links: http://dx.doi.org/10.1016/j.vibspec.2010.01.009
• Document type: Conference paper
• Publisher: Elsevier
• Topic: Atom and Molecular Physics and Optics
• Keywords: Vibrational relaxation; Spectral density; Huang-Rhys factor; System-bath interaction; Photon echo; Fluorescence line narrowing
• Conference name: 5th International Conference on Advanced Vibrational Spectroscopy
• Conference date: 2009-07-12 - 2009-07-17
• Conference place: Melbourne, Australia
• Status: Published
• ISBN/ISSN/Other: ISSN: 0924-2031