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Towards spectrally selective catastrophic response.

V R Gabriele1, A Shvonski1,2, C S Hoffman3

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Large electromagnetic radiation causes molecules to transition from linear to nonlinear responses, leading to universal breakup patterns. This spectral selectivity in molecular denaturation has potential applications in biology and medicine.

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Area of Science:

  • Physics
  • Chemistry
  • Biophysics

Background:

  • Molecules exhibit complex responses to electromagnetic radiation.
  • Understanding molecular breakup under intense fields is crucial for various applications.

Purpose of the Study:

  • To investigate the universal behavior of molecular responses to large-amplitude electromagnetic radiation.
  • To explore the transition from linear to nonlinear response and molecular dissociation.
  • To identify potential applications of spectrally selective molecular denaturation.

Main Methods:

  • Studied classical molecular models, including the harmonic oscillator and Peyrard-Bishop-Dauxois models for DNA.
  • Incorporated environmental effects like damping and dephasing due to thermal fluctuations.
  • Analyzed the formation of dissociation domains in amplitude-frequency space.

Main Results:

  • Demonstrated universal behavior in molecular response and breakup across different models.
  • Identified characteristic domains of dissociation with local boundary minima in driving force amplitude-frequency space.
  • Showed that increasing radiation intensity leads to spectrally selective minima, retaining ultrahigh spectral selectivity.

Conclusions:

  • The universal behavior observed is linked to the fold catastrophe universality class of Thom's catastrophe theory.
  • High spectral sensitivity is expected near the onset of denaturation in biostructures like DNA.
  • Spectrally selective molecular denaturation offers promising applications in biology and medicine.