Femtosecond spectroscopy on simple molecular systems: pump-probe and four-wave mixing techniques

T. Chen; H. Dietz; V. Engel; M. Heid; Wolfgang Kiefer; G. Knopp; A. Materny; S. Meyer; R. Pausch; Michael Schmitt; H. Schwoerer; T. Siebert

doi:10.1117/12.340043

28 January 1999 Femtosecond spectroscopy on simple molecular systems: pump-probe and four-wave mixing techniques

T. Chen, H. Dietz, V. Engel, M. Heid, Wolfgang Kiefer, G. Knopp, A. Materny, S. Meyer, R. Pausch, Michael Schmitt, H. Schwoerer, T. Siebert

Author Affiliations +

Proceedings Volume 3733, ICONO '98: Nonlinear Optical Phenomena and Coherent Optics in Information Technologies; (1999) https://doi.org/10.1117/12.340043
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

Abstract

Different techniques are applied in order to obtain information about ultrafast molecular and reaction dynamics. Femtosecond time-resolved pump-probe spectroscopy is used to investigate the dissociation reaction of NAI molecules. Starting from free NaI molecules, the environment is changed to solution-like conditions adding rare gas with different pressures. Femtosecond time-resolved degenerate four-wave mixing (DFWM) spectroscopy is performed in order to investigate molecular dynamics in iodine molecules in the gas phase. Depending on the timing of the laser pulses different dynamics are reflected in the DFWM transient signal. By the use of time evolution diagrams, the varying contribution of ground and excited-state dynamics can be explained conclusively. Supersonic jet-cooled potassium dimers are investigated in their electronic ground state by a femtosecond pump-probe experiment. The ground state vibrational wave packets are created by a stimulated Raman pumping process and selectively interrogated by resonance enhanced three photon ionization.

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T. Chen, H. Dietz, V. Engel, M. Heid, Wolfgang Kiefer, G. Knopp, A. Materny, S. Meyer, R. Pausch, Michael Schmitt, H. Schwoerer, and T. Siebert "Femtosecond spectroscopy on simple molecular systems: pump-probe and four-wave mixing techniques", Proc. SPIE 3733, ICONO '98: Nonlinear Optical Phenomena and Coherent Optics in Information Technologies, (28 January 1999); https://doi.org/10.1117/12.340043

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