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Brumfield BE, Stewart JT, Widicus Weaver SL, et al. A quantum cascade laser cw cavity ringdown spectrometer coupled to a supersonic expansion source. Rev Sci Instrum. 2010;81(6):063102doi: 10.1063/1.3427357.
Brumfield, B. E., Stewart, J. T., Widicus Weaver, S. L., Escarra, M. D., Howard, S. S., Gmachl, C. F., & McCall, B. J. (2010). A quantum cascade laser cw cavity ringdown spectrometer coupled to a supersonic expansion source. The Review of scientific instruments, 81(6), 063102. https://doi.org/10.1063/1.3427357
Brumfield, Brian E, et al. "A quantum cascade laser cw cavity ringdown spectrometer coupled to a supersonic expansion source." The Review of scientific instruments vol. 81,6 (2010): 063102. doi: https://doi.org/10.1063/1.3427357
Brumfield BE, Stewart JT, Widicus Weaver SL, Escarra MD, Howard SS, Gmachl CF, McCall BJ. A quantum cascade laser cw cavity ringdown spectrometer coupled to a supersonic expansion source. Rev Sci Instrum. 2010 Jun;81(6):063102. doi: 10.1063/1.3427357. PMID: 20590220.
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Rev Sci Instrum. 2010 Jun;81(6):063102. doi: 10.1063/1.3427357.

A quantum cascade laser cw cavity ringdown spectrometer coupled to a supersonic expansion source.

The Review of scientific instruments

Brian E Brumfield, Jacob T Stewart, Susanna L Widicus Weaver, Matthew D Escarra, Scott S Howard, Claire F Gmachl, Benjamin J McCall

Affiliations

  1. Department of Chemistry, University of Illinois, Urbana, Illinois 61801, USA.

PMID: 20590220 DOI: 10.1063/1.3427357

Abstract

A new instrument has been constructed that couples a supersonic expansion source to a continuous wave cavity ringdown spectrometer using a Fabry-Perot quantum cascade laser (QCL). The purpose of the instrument is to enable the acquisition of a cold, rotationally resolved gas phase spectrum of buckminsterfullerene (C(60)). As a first test of the system, high resolution spectra of the nu(8) vibrational band of CH(2)Br(2) have been acquired at approximately 1197 cm(-1). To our knowledge, this is the first time that a vibrational band not previously recorded with rotational resolution has been acquired with a QCL-based ringdown spectrometer. 62 transitions of the three isotopologues of CH(2)Br(2) were assigned and fit to effective Hamiltonians with a standard deviation of 14 MHz, which is smaller than the laser frequency step size. The spectra have a noise equivalent absorption coefficient of 1.4 x 10(-8) cm(-1). Spectral simulations of the band indicate that the supersonic source produces rotationally cold (approximately 7 K) molecules.

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