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With the development of the field of molecular reaction dynamics [1], researchers tried to explore its various aspects – among which “control of chemical reactions” has always been a prime objective. If the outcome of a chemical reaction can be controlled, then it will allow the synthesis of new materials and suppress unwanted side products. Recent advances of femtochemistry along with the birth of attochemistry provided laser light as an additional tool for control [2] besides the traditional thermodynamic techniques.
Today’s ultrashort, intense laser pulses opened new possibilities for quantum control; nonresonant dynamic Stark control (DSC) [3-5]. Since it is independent of the wavelength of the applied laser field, it’s quite flexible from an experimental point of view [3]. In this talk, I will
discuss the idea of dynamic Stark effect to excite non-stationary vibrational states of HOD and followed by its application to demonstrate preferential bond breaking in the photodissociation
dynamics of the molecule [6]. In addition, the effect of considering a randomly oriented sample with respect to the linearly polarized laser field will be shown and the influence of carrier envelope-phase of the ultrashort laser pulses on the vibrational dynamics will be discussed. With the increasing popularity of coherent control schemes to achieve desired research targets over the past two decades, the prospect of selective bond breaking of HOD with linear temporal chirp of a VUV pulse will also be presented [7].
[1] N. E. Henriksen and F. Y. Hansen, Theories of Molecular Reaction Dynamics: The Microscopic
Foundation of Chemical Kinetics, Oxford University Press (2008).
[2] A. H. Zewail, Angew. Chem. Int. Ed. 39, 2586 (2000).
[3] B. J. Sussman, D. Townsend, M. Y. Ivanov, and A. Stolow, Science 314, 278 (2006).
[4] E. F. Thomas and N. E. Henriksen, J. Chem. Phys. 144, 244307 (2016).
[5] E. F. Thomas and N. E. Henriksen, J. Phys. Chem. Lett. 8, 2212 (2017).
[6] D. Dey and N. E. Henriksen, J. Chem. Phys. 148, 234307 (2018).
[7] D. Dey, A. K. Tiwari, and N. E. Henriksen, Chem. Phys. Lett. (2018)(accepted). |