| Literature DB >> 16217021 |
Dmitry Pestov1, Miaochan Zhi, Zoe-Elizabeth Sariyanni, Nikolai G Kalugin, Alexandre A Kolomenskii, Robert Murawski, Gerhard G Paulus, Vladimir A Sautenkov, Hans Schuessler, Alexei V Sokolov, George R Welch, Yuri V Rostovtsev, Torsten Siebert, Denis A Akimov, Stefanie Graefe, Wolfgang Kiefer, Marlan O Scully.
Abstract
We use time-resolved coherent Raman spectroscopy to obtain molecule-specific signals from dipicolinic acid (DPA), which is a marker molecule for bacterial spores. We use femtosecond laser pulses in both visible and UV spectral regions and compare experimental results with theoretical predictions. By exciting vibrational coherence on more than one mode simultaneously, we observe a quantum beat signal that can be used to extract the parameters of molecular motion in DPA. The signal is enhanced when an UV probe pulse is used, because its frequency is near-resonant to the first excited electronic state of the molecule. The capability for unambiguous identification of DPA molecules will lead to a technique for real-time detection of spores.Entities:
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Year: 2005 PMID： 16217021 PMCID： PMC1257716 DOI： 10.1073/pnas.0506529102
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN： 0027-8424 Impact factor: 11.205