Resonant uv pump-probe spectroscopy of dipicolinic acid via impulsive excitation
- Institute for Quantum Studies and Department of Physics, Texas A and M University, College Station, Texas 77843-4242, USA and Department of Physics, Drew University, Madison, New Jersey 07940 (United States)
We present experimental evidence of coherent wave packet motion in dipicolinic acid (C{sub 7}H{sub 5}NO{sub 4}) 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{sup -1} and 1500 cm{sup -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.
- OSTI ID:
- 21140502
- Journal Information:
- Physical Review. A, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevA.77.023403; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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