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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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Resonance Enhanced Multiphoton Ionization Detected Millimeter-Wave Absorption: The 115 GHz Line of CO
V Beutner1, L M Duffy2, H Meyer1
1Department of Physics and Astronomy , The University of Georgia , Athens , Georgia 30602-2451 , United States.
The Journal of Physical Chemistry. A
|February 16, 2019
Summary
This study demonstrates sensitive millimeter-wave absorption detection using carbon monoxide (CO) and resonance enhanced multiphoton ionization (REMPI). This technique shows potential for advancing high-resolution molecular spectroscopy into terahertz frequencies.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Spectroscopy
- Quantum Electronics
Background:
- Millimeter-wave (MMW) spectroscopy is crucial for molecular analysis.
- High-resolution techniques are needed for precise molecular characterization.
- Carbon monoxide (CO) offers a well-defined two-level system for fundamental studies.
Purpose of the Study:
- To investigate millimeter-wave absorption detection using multiphoton ionization.
- To establish CO's lowest rotational transition as a sensitive diagnostic tool.
- To explore the extension of molecular beam spectroscopy into terahertz frequencies.
Main Methods:
- Utilizing the CO (J = 1 ← J = 0) transition at 115 GHz.
- Employing a powerful continuous millimeter-wave source and pulsed molecular beam.
- Detecting absorption via resonance enhanced multiphoton ionization (REMPI).
- Analyzing polarization, saturation, and Doppler effects for coherence confirmation.
Main Results:
- Demonstrated sensitive detection of millimeter-wave absorption.
- Confirmed coherent interaction with the millimeter-wave field, consistent with a two-level system.
- Characterized the millimeter-wave field as a Gaussian beam with specific parameters.
- Successfully tracked molecular trajectories using time-correlated frequency modulation.
Conclusions:
- Millimeter-wave absorption via REMPI is a viable and sensitive detection method.
- The CO two-level system accurately models the observed interactions.
- This approach holds significant potential for advancing high-resolution spectroscopy into the sub-terahertz and terahertz regimes.
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