Journal
NEW JOURNAL OF PHYSICS
Volume 11, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/11/12/123026
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Funding
- EPSRC
- STFC
- EPSRC [EP/F035160/1, EP/E036112/1] Funding Source: UKRI
- STFC [PP/E000436/1, PP/D00425X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E036112/1, EP/F035160/1] Funding Source: researchfish
- Science and Technology Facilities Council [PP/D00425X/1, PP/E000436/1] Funding Source: researchfish
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We demonstrate Doppler-free saturated absorption spectroscopy of cold molecular radicals formed by laser ablation inside a cryogenic buffer gas cell. By lowering the temperature, congested regions of the spectrum can be simplified, and by using different temperatures for different regions of the spectrum a wide range of rotational states can be studied optimally. We use the technique to study the optical spectrum of YbF radicals with a resolution of 30 MHz, measuring the magnetic hyperfine parameters of the electronic ground state. The method is suitable for high-resolution spectroscopy of a great variety of molecules at controlled temperature and pressure, and is particularly well suited to those that are difficult to produce in the gas phase.
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