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Researchers controlled energy transfer from ammonia (NH3) molecules to helium (He) atoms using low electric fields. This study explored resonant energy transfer in cold atom-molecule collisions.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Chemical Physics

Background:

  • Triplet Rydberg states of helium (He) atoms are crucial for energy transfer studies.
  • Ammonia (NH3) inversion sublevels serve as energy donors in controlled collisions.
  • Low-temperature (∼1 K) intrabeam collisions enable precise study of energy transfer dynamics.

Purpose of the Study:

  • To investigate and control the resonant transfer of energy from NH3 to He atoms.
  • To explore the influence of electric fields on atom-molecule collision dynamics.
  • To analyze energy transfer mechanisms at low collision energies.

Main Methods:

  • Experiments utilized pulsed supersonic beams of NH3 seeded in He.
  • Helium atoms were prepared in metastable 1s2s 3S1 states via electric discharge.
  • Rydberg-state-selective electric-field ionization was employed to detect resonant energy transfer.

Main Results:

  • Energy transfer from NH3 inversion sublevels to He Rydberg states (n=38) was successfully controlled.
  • Electric fields below 15 V/cm effectively modulated the energy transfer process.
  • Collision studies were conducted at low center-of-mass speeds (∼70 m/s) by exploiting velocity slip.

Conclusions:

  • The study demonstrates precise control over resonant energy transfer in cold atom-molecule collisions.
  • Experimental findings align with theoretical models of resonant dipole-dipole interactions.
  • This work provides insights into fundamental energy transfer processes relevant to quantum control and cold chemistry.