Millimeter-wave optical double resonance schemes for rapid assignment of perturbed spectra, with applications to the [~ over C] [superscript 1]B[subscript 2] state of SO[subscript 2]
Millimeter-wave detected, millimeter-wave optical double resonance (mmODR) spectroscopy is a powerful tool for the analysis of dense, complicated regions in the optical spectra of small molecules. The availability of cavity-free microwave and millimeter wave spectrometers with frequency-agile genera...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Institute of Physics (AIP)
2015
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| Online Access: | http://hdl.handle.net/1721.1/96911 https://orcid.org/0000-0001-5996-8217 https://orcid.org/0000-0002-1348-9584 https://orcid.org/0000-0002-3526-3797 https://orcid.org/0000-0002-7609-4205 |
| Summary: | Millimeter-wave detected, millimeter-wave optical double resonance (mmODR) spectroscopy is a powerful tool for the analysis of dense, complicated regions in the optical spectra of small molecules. The availability of cavity-free microwave and millimeter wave spectrometers with frequency-agile generation and detection of radiation (required for chirped-pulse Fourier-transform spectroscopy) opens up new schemes for double resonance experiments. We demonstrate a multiplexed population labeling scheme for rapid acquisition of double resonance spectra, probing multiple rotational transitions simultaneously. We also demonstrate a millimeter-wave implementation of the coherence-converted population transfer scheme for background-free mmODR, which provides a ∼10-fold sensitivity improvement over the population labeling scheme. We analyze perturbations in the [~ over C] state of SO[subscript 2], and we rotationally assign a b[subscript 2] vibrational level at 45 328 cm[superscript −1] that borrows intensity via a c-axis Coriolis interaction. We also demonstrate the effectiveness of our multiplexed mmODR scheme for rapid acquisition and assignment of three predissociated vibrational levels of the [~ over C] state of SO[subscript 2] between 46 800 and 47 650 cm[superscript −1]. |
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