Zeeman Tuning Rates for Q-Branch Transitions in the nu3 Band of NO2

Area of Science:

• Molecular spectroscopy
• Quantum optics
• Chemical physics

Background:

• The nu3 band of nitrogen dioxide (NO2) exhibits complex spectral features.
• Understanding the Zeeman effect in molecules is crucial for spectroscopy and quantum control.
• Spin-rotation interactions can influence molecular energy levels in magnetic fields.

Purpose of the Study:

• To measure Zeeman tuning rates for Q-branch transitions in the NO2 nu3 band.
• To investigate the influence of spin-rotation interactions on these rates.
• To compare experimental results with theoretical models for Hund's case (b) molecules.

Main Methods:

• High-resolution spectroscopy was used to observe NO2 transitions.
• Measurements were performed under varying magnetic fields up to 564 Gauss.
• Data analysis involved fitting spectral line positions to determine tuning rates.

Main Results:

• The average measured Zeeman tuning rate is 0.1815(53) x 10(-3) cm-1/Gauss.
• No significant dependence of tuning rate on the Ka quantum number was observed.
• Experimental results closely match the predictions of a simple linear model, despite spin-rotation interactions.

Conclusions:

• The Zeeman tuning rates for NO2 Q-branch transitions are well-described by a model neglecting inter-J spin-rotation effects.
• Spin-rotation interactions have a minimal impact on the measured tuning rates within the studied magnetic field range.
• Further analysis of the full Hamiltonian is needed to fully understand spin-rotation effects at higher magnetic fields.