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Cavity Enhanced Spectroscopies for Applications of Remote Sensing, Chemical Kinetics and Detection of Radical Species


Bui, Thinh Quoc (2015) Cavity Enhanced Spectroscopies for Applications of Remote Sensing, Chemical Kinetics and Detection of Radical Species. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z96D5QXW.


This thesis describes applications of cavity enhanced spectroscopy towards applications of remote sensing, chemical kinetics and detection of transient radical molecular species. Both direct absorption spectroscopy and cavity ring-down spectroscopy are used in this work. Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was utilized for measurements of spectral lineshapes of O2 and CO2 for obtaining laboratory reference data in support of NASA’s OCO-2 mission. FS-CRDS is highly sensitive (> 10 km absorption path length) and precise (> 10000:1 SNR), making it ideal to study subtle non-Voigt lineshape effects. In addition, these advantages of FS-CRDS were further extended for measuring kinetic isotope effects: A dual-wavelength variation of FS-CRDS was used for measuring precise D/H and 13C/12C methane isotope ratios (sigma>0.026%) for the purpose of measuring the temperature dependent kinetic isotope effects of methane oxidation with O(1D) and OH radicals. Finally, direct absorption spectroscopic detection of the trans-DOCO radical via a frequency combs spectrometer was conducted in collaboration with professor Jun Ye at JILA/University of Colorado.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:CO2, O2 A-band, Lineshapes, Kinetic Isotope EFfects, Methane, trans-DOCO
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Awards:The Herbert Newby McCoy Award, 2015
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Okumura, Mitchio
Thesis Committee:
  • Marcus, Rudolph A. (chair)
  • Cai, Long
  • Libbrecht, Kenneth George
  • Blake, Geoffrey A.
  • Okumura, Mitchio
Defense Date:22 May 2015
Non-Caltech Author Email:novicebeing (AT)
Funding AgencyGrant Number
NASA Mars Fundamental Research ProgramNNX12AI01G
NASA, OCO-2NAS7-03001
NASA Earth and Space Science FellowshipNNX09AP08H
NSF Graduate Research FellowshipUNSPECIFIED
Record Number:CaltechTHESIS:06032015-151007228
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8978
Deposited By: Thinh Bui
Deposited On:05 Jun 2015 18:07
Last Modified:04 Oct 2019 00:08

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