Journal of Analytical & Bioanalytical Techniques
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Cavity ring-down absorption spectroscopy (CRDS) is based upon the measurement of the decay rate of light trapped in an
optical cavity with high reflectance. When a pulsed laser radiation is guided into an optical cavity, the small amount of light
trapped inside the cavity reflects between two highly reflective mirrors (R>99.9%) with a small fraction transmitting through
each mirror for each pass. The decay rate of the light leaking out of the cavity is related to the absorption coefficient of the
sample in the cavity. Therefore, the CRDS method may ignore fluctuation of incident radiation intensity, with better sensitivity
than conventional absorption methods due to a longer optical path. It has been developed as a promising alternative, when
modern fluorescence or ionization techniques may not be effectively applied. We have applied this technique to measure the Br2
elimination channel in the photodissociation of a series of dibromo-alkanes and dibromo-alkenes. Evanescent wave cavity ring-
down absorption spectroscopy (EW-CRDS) is one popular technique for the CRDS application in the condensed phase. We have
applied this technique to measure the thermodynamic properties and orientation on the surface adsorption for organic dyes.
King-Chuen Lin received his Ph.D. from Department of Chemistry, Michigan State University in 1982. After postdoctoral career in Cornell University,
he joined Department of Chemistry, National Taiwan Univ., Taiwan. He has been awarded as Distinguished Research Fellow of National Science
Council, from 1996 to 2002. He is a Distinguished Professor of National Taiwan University from 2005. He received an academic achievement from
the Chemical Society located in Taipei in 2009. He has published more than 140 scientific papers in prestigious international refereed journals in the
area of physical chemistry, chemical physics and analytical chemistry.
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