研究目的
Investigating the resonant transfer of energy from the inversion sublevels in NH3 to He atoms in triplet Rydberg states with principal quantum number n = 38, controlled using electric fields below 15 V/cm in intrabeam collisions at translational temperatures of ～1 K.
研究成果
Rydberg-state-resolved and electric-field-controlled resonant energy transfer in collisions of ground-state NH3 molecules with Rydberg He atoms at translational temperatures of ～1 K was observed. The work paves the way for experiments at lower collision energies to exploit resonant dipole?dipole interactions for regulating access to short-range chemical dynamics.
研究不足
The impact parameter method used in the calculations does not account for energy-level shifts arising from resonant dipole?dipole interactions at low collision energies, representing a limit to the method's validity. The rotational temperature of NH3 was inferred to be higher than typical for supersonic beams, attributed to collision-induced heating near the valve.
1：Experimental Design and Method Selection:
The experiments were performed in pulsed supersonic beams of NH3 seeded in He at a ratio of 1:19. The He atoms were prepared in the metastable 1s2s 3S1 level in a pulsed electric discharge. The velocity slip between NH3 and metastable He was exploited for collision studies at center-of-mass collision speeds of ～70 m/s. Resonant energy transfer was identified by Rydberg-state-selective electric-field ionization.
2：The He atoms were prepared in the metastable 1s2s 3S1 level in a pulsed electric discharge. The velocity slip between NH3 and metastable He was exploited for collision studies at center-of-mass collision speeds of ～70 m/s. Resonant energy transfer was identified by Rydberg-state-selective electric-field ionization.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Pulsed supersonic beams of NH3 seeded in He.
3：List of Experimental Equipment and Materials:
Pulsed electric discharge setup, CW lasers for excitation, parallel copper electrodes for electric field application, microchannel plate (MCP) detector for Rydberg-state-selective detection.
4：Experimental Procedures and Operational Workflow:
Preparation of metastable He atoms, laser photoexcitation to Rydberg states, application of pulsed electric fields for energy transfer control, Rydberg-state-selective ionization, and detection.
5：Data Analysis Methods:
Comparison of experimental data with a theoretical model based on the impact parameter method for resonant dipole?dipole interactions.
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