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Cavity Ring Down Spectroscopy:A Review


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1 Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Amaravathi Road, Guntur, India
     

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Over the past decade, cavity ring down spectroscopy has emerged as a powerful technique for performing direct absorption measurements using pulsed lasers. Cavity ring down spectroscopy has since been used from the ultraviolet to the mid-infrared. It is a direct absorption technique, which can be performed with pulsed or continuous light sources and has a significantly higher sensitivity than obtainable in conventional absorption spectroscopy. It can be used to measure the concentration of some light-absorbing substances. Typically, the substances to be measured are in gaseous form. This technique is most widely known as cavity ring-down spectroscopy, although the alternative, but more cumbersome, cavity ring-down laser absorption spectroscopy is preferred by some authors. Here we discuss about the experimental implementation of Cavity ring down spectroscopy and its application to a number of areas of research including laser diagnostics of hostile environments, reaction kinetics and spectroscopy, with particular emphasis on our ongoing studies of the fast (sub-nanosecond) pre dissociation of electronically excited states of small molecules and radicals.

Keywords

Cavity Ring Down Spectroscopy, Absorption Spectroscopy.
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  • Cavity Ring Down Spectroscopy:A Review

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Authors

P. Nagaraju
Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Amaravathi Road, Guntur, India
V. D. N. Srinivas
Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Amaravathi Road, Guntur, India
S. V. N. Padma
Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Amaravathi Road, Guntur, India
P. N. V. Gopal
Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Amaravathi Road, Guntur, India
D. Mallikarjuna Rao
Department of Pharmaceutical Analysis, Hindu College of Pharmacy, Amaravathi Road, Guntur, India

Abstract


Over the past decade, cavity ring down spectroscopy has emerged as a powerful technique for performing direct absorption measurements using pulsed lasers. Cavity ring down spectroscopy has since been used from the ultraviolet to the mid-infrared. It is a direct absorption technique, which can be performed with pulsed or continuous light sources and has a significantly higher sensitivity than obtainable in conventional absorption spectroscopy. It can be used to measure the concentration of some light-absorbing substances. Typically, the substances to be measured are in gaseous form. This technique is most widely known as cavity ring-down spectroscopy, although the alternative, but more cumbersome, cavity ring-down laser absorption spectroscopy is preferred by some authors. Here we discuss about the experimental implementation of Cavity ring down spectroscopy and its application to a number of areas of research including laser diagnostics of hostile environments, reaction kinetics and spectroscopy, with particular emphasis on our ongoing studies of the fast (sub-nanosecond) pre dissociation of electronically excited states of small molecules and radicals.

Keywords


Cavity Ring Down Spectroscopy, Absorption Spectroscopy.