Document Detail

Linear dichroism amplification: Adapting a long-known technique for ultrasensitive femtosecond IR spectroscopy.
MedLine Citation:
PMID:  21456685     Owner:  NLM     Status:  Publisher    
We demonstrate strong amplification of polarization-sensitive transient IR signals using a pseudo-null crossed polarizer technique first proposed by Keston and Lospalluto [Fed. Proc. 10, 207 (1951)] and applied for nanosecond flash photolysis in the visible by Che et al. [Chem. Phys. Lett. 224, 145 (1994)]. We adapted the technique to ultrafast pulsed laser spectroscopy in the infrared using photoelastic modulators, which allow us to measure amplified linear dichroism at kilohertz repetition rates. The method was applied to a photoswitch of the N-alkylated Schiff base family in order to demonstrate its potential of strongly enhancing sensitivity and signal to noise in ultrafast transient IR experiments, to simplify spectra and to determine intramolecular transition dipole orientations.
Julien Réhault; Vinicio Zanirato; Massimo Olivucci; Jan Helbing
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Publication Detail:
Journal Detail:
Title:  The Journal of chemical physics     Volume:  134     ISSN:  1089-7690     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-4-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  124516     Citation Subset:  -    
Physikalisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, SwitzerlandDipartimento di Scienze Farmaceutiche, Universitá di Ferrara, via Fossato di Mortara 17-19, I-44100 Ferrara, ItalyDipartimento di Chimica, Universitá di Siena, via Aldo Moro 2, I-53100 Siena, Italy and Chemistry Department, Bowling Green State University, Bowling Green, Ohio 43403, USA.
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