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This study introduces a new spectroscopic method using entangled two-photon absorption (TPA) to detect optically forbidden molecular states. The technique allows for accurate measurement of these states by indirectly observing photon emission from an excited state.

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Area of Science:

  • Quantum spectroscopy
  • Molecular physics
  • Spectroscopic methods

Background:

  • Optically forbidden states are challenging to measure directly.
  • Traditional spectroscopic methods may not be suitable for all molecular states.

Purpose of the Study:

  • To theoretically propose a novel spectroscopic method for measuring optically forbidden states.
  • To demonstrate the feasibility of this method using a diatomic molecular system.

Main Methods:

  • Utilizing entangled two-photon absorption (TPA) to pump an excited state.
  • Indirectly measuring the optically forbidden intermediate state via photon emission from the excited state.
  • Modeling a three-adiabatic-potential diatomic molecular system (ground, intermediate, excited states).

Main Results:

  • The proposed method allows for the detection of optically forbidden states.
  • High accuracy in detection is achievable when efficient and selective TPA is realized.
  • The primary condition is a sufficiently high transition rate between the excited and intermediate states.

Conclusions:

  • Entangled TPA offers a viable route for probing optically forbidden molecular states.
  • This spectroscopic technique provides a new tool for molecular characterization.
  • The method's success relies on efficient TPA and favorable transition rates.