High-Resolution Spectroscopy of the ν_8 Band of Methylene Bromide Using a Quantum Cascade Laser-Based Cavity Ringdown Spectrometer

Details High-Resolution Spectroscopy of the ν_8 Band of Methylene Bromide Using a Quantum Cascade Laser-Based Cavity Ringdown Spectrometer High-Resolution Spectroscopy of the ν_8 Band of Methylene Bromide Using a Quantum Cascade Laser-Based Cavity Ringdown Spectrometer

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefa02s&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Computer Science

Performance

Infrared/Raman (Vibrational)

Scientific paper

Our group has constructed a cavity ringdown spectrometer based on a quantum cascade laser (QCL) in an effort to obtain a high-resolution gas phase spectrum of buckminsterfullerene (C60). To test the performance of our spectrometer we have observed the ν_8 band of methylene bromide (CH_2Br_2) from 1196 to 1197.5 cm-1. This band had previously only been recorded at low resolution. Cold methylene bromide molecules were produced in a continuous supersonic expansion from a 700 μm pinhole and probed using continuous wave cavity ringdown spectroscopy (cw-CRDS). To our knowledge, this is the first experiment to measure a supersonic jet-cooled sample using a QCL-based cw-CRDS spectrometer. We have assigned the observed ro-vibrational lines from the three isotopomers of CH_2Br_2 to effective Hamiltonians, and find that the molecules have been cooled to a rotational temperature of ˜3--10 K.

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