PROBING BUFFER-GAS COOLED MOLECULES WITH DIRECT FREQUENCY COMB SPECTROSCOPY IN THE MID-INFRRARED

Spaun, Ben

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https://hdl.handle.net/2142/79458 Copy

Description

Title

PROBING BUFFER-GAS COOLED MOLECULES WITH DIRECT FREQUENCY COMB SPECTROSCOPY IN THE MID-INFRRARED

Author(s)

Spaun, Ben

Contributor(s)

• Ye, Jun
• Doyle, John M.
• Patterson, David
• Heckl, Oliver H.
• Bjork, Bryce J.
• Changala, Bryan

Issue Date

24-Jun-15

Keyword(s)

Mini-symposium: High-Precision Spectroscopy

Abstract

We present the first demonstration of cavity-enhanced direct frequency comb spectroscopyfootnote{A. Foltynowicz emph{et al}. Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide. Applied Physics B, vol. 110, pp. 163�175, 2013.} on buffer-gas cooled moleculesfootnote{D. Patterson and J. M. Doyle. Cooling molecules in a cell for FTMW spectroscopy. Molecular Physics 110, 1757�1766, 2012.}. By coupling a mid-infrared frequency comb to a high-finesse cavity surrounding a helium buffer-gas chamber, we can gather rotationally resolved absorption spectra with high sensitivity over a broad wavelength region. The measured $sim$10 K rotational and translational temperatures of buffer-gas cooled molecules drastically simplify the observed spectra, compared to those of room temperature molecules, and allow for high spectral resolution limited only by Doppler broadening (10-100 MHz). Our system allows for the extension of high-resolution spectroscopy to larger molecules, enabling detailed analysis of molecular structure and dynamics, while taking full advantage of the powerful optical properties of frequency combs.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79458

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