Resonant uv pump-probe spectroscopy of dipicolinic acid via impulsive excitation
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abstract
We present experimental evidence of coherent wave packet motion in dipicolinic acid (C7 H5 N O4) which is an important marker molecule for bacterial spores. Resonant impulsive excitation is achieved by applying a uv pump pulse (267 nm, 16 fs) which has a duration that is shorter than the vibrational period of the molecules. The resulting dynamics is then probed with a weaker pulse of the same width and frequency. Evidence of the important "fingerprint" region for this molecule (between 1000 cm-1 and 1500 cm-1) is found in the transient absorption of the probe. We present simulations of the pump-probe experiment, based on the Liouville equation for the density matrix, and predict the optimal pulse width and detuning. 2008 The American Physical Society.
Murawski, R. K., Rostovtsev, Y. V., Sariyanni, Z., Sautenkov, V. A., Backus, S., Raymondson, D., ... Scully, M. O.
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Murawski, Robert K||Rostovtsev, Yuri V||Sariyanni, Zoe-Elizabeth||Sautenkov, Vladimir A||Backus, Sterling||Raymondson, Daisy||Kapteyn, Henry C||Murnane, Margaret M||Scully, Marlan O