Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-49633
Rehault, J; Zanirato, V; Olivucci, M; Helbing, J (2011). Linear dichroism amplification: Adapting a long-known technique for ultrasensitive femtosecond IR spectroscopy. Journal of Chemical Physics, 134(12):124516.
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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.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Date:||28 March 2011|
|Deposited On:||01 Mar 2012 12:00|
|Last Modified:||13 Jun 2014 14:56|
|Publisher:||American Institute of Physics|
|Funders:||Swiss National Science Foundation (SNF)|
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