Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: High Resolution Spectroscopy

MO 7.3: Talk

Monday, March 5, 2018, 16:45–17:00, PA 1.150

Precision Spectroscopy of the Hydroxyl Radical — •Arthur Fast¹, John E. Furneaux², and Samuel A. Meek¹ — ¹Max Planck Institute for Biophysical Chemistry, Germany — ²University of Oklahoma, USA

We present results on optical frequency comb referenced spectroscopy of the A ²Σ⁺,v′=0←X ²Π_3/2,v″=0,J″=1/2 transitions in OH. The comb spans from 1064 nm to 532 nm and is locked to a Nd:YAG laser. This laser is, in turn, stabilized to a molecular iodine transition using saturated absorption spectroscopy, resulting in a relative short-term stability of better than 10⁻¹². The A-X transitions near 308 nm are measured using laser-induced fluorescence in a supersonic molecular beam. The spectroscopy laser is a frequency-doubled CW dye laser which is directly stabilized to the comb. A sub 100 kHz measurement precision allows us to determine the spectroscopic constants much more precisely, up to two orders of magnitude better than the current literature values.