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Infrared spectroscopy of buffer-gas cooled molecules

Event Details

Event Dates: 

Wednesday, May 2, 2018 - 1:00pm

Seminar Location: 

  • JILA Auditorium

Speaker Name(s): 

Cameron Straatsma

Speaker Affiliation(s): 

JILA, Lewandowski group
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Thesis Defense

Event Details & Abstract: 

Infrared absorption spectroscopy is a highly sensitive technique for probing molecular structure, and when combined with cold molecular beam methods it provides unparalleled spectral resolution and absorption sensitivity to transitions in isolated gas-phase molecules. A portion of this dissertation investigates molecular beams of large polyatomic molecules produced via laser ablation of solid targets inside a buffer-gas cooling cell. Using matrix isolation spectroscopy to study the ablation products of graphite, we observe carbon clusters C_3 to C_12 produced at a rate of approximately 10^11 – 10^12 molecules for every pulse of the ablation laser. In a similar fashion, we study the production of metal oxide molecules with a buffer-gas beam source by ablating pure metal in the presence of O_2 gas, and find consistent production of the WO molecule. Finally, we discuss efforts towards high resolution rotational-vibrational spectroscopy of WO in the gas phase.

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