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Initial state-specific photodissociation dynamics of pyrrole via 1 π σ ∗/S 0 conical intersection initiated with optimally controlled UV-laser pulses

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Abstract

Optimal initiation of quantum dynamics of N-H photodissociation of pyrrole on the S 0-1 π σ ∗(1 A 2) coupled electronic states by UV-laser pulses in an effort to guide the subsequent dynamics to dissociation limits is studied theoretically. Specifically, the task of designing optimal laser pulses that act on initial vibrational states of the system for an effective UV-photodissociation is considered by employing optimal control theory. The associated control mechanism(s) for the initial state dependent photodissociation dynamics of pyrrole in the presence of control pulses is examined and discussed in detail. The initial conditions determine implicitly the variation in the dissociation probabilities for the two channels, upon interaction with the field. The optimal pulse corresponds to the objective fixed as maximization of overall reactive flux subject to constraints of reasonable fluence and quantum dynamics. The simple optimal pulses obtained by the use of genetic algorithm based optimization are worth an experimental implementation given the experimental relevance of π σ ∗-photochemistry in recent times.

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Authors and Affiliations

  1. School of Chemistry, University of Hyderabad, 500 046, Hyderabad, India

    K. R. Nandipati, Arun Kumar Kanakati & S. Mahapatra

  2. Center for Computational Natural Sciences and Bioinformatics, IIIT Hyderabad, 500 032, Hyderabad, India

    H. Singh

  3. CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, CAS, Qingdao, 266101, P.R. China

    Z. Lan

Authors
  1. K. R. Nandipati
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  2. Arun Kumar Kanakati
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  3. H. Singh
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  4. Z. Lan
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  5. S. Mahapatra
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Correspondence to S. Mahapatra.

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Nandipati, K.R., Kanakati, A.K., Singh, H. et al. Initial state-specific photodissociation dynamics of pyrrole via 1 π σ ∗/S 0 conical intersection initiated with optimally controlled UV-laser pulses. Eur. Phys. J. D 71, 222 (2017). https://doi.org/10.1140/epjd/e2017-70764-y

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  • DOI: https://doi.org/10.1140/epjd/e2017-70764-y

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