The theoretical bases of saturated-absorption cavity ring-down (SCAR) spectroscopy are treated and described in detail in different transition broadening regimes. All the approximations that are introduced to achieve a model as simple and accurate as possible are discussed. In the Voigt broadening regime, a calibration factor that relates the measured spectral areas in the saturated and linear absorption regimes is retrieved. A relevant application of this technique to the measurement of radiocarbon dioxide concentration at both enriched and natural abundance (similar to 10(-12)) is presented. The population relaxation rate of one ro-vibrational state of the nu(3) band is measured for this highly diluted CO2 isotopologue. (C) 2015 Optical Society of America
Theory of saturated-absorption cavity ring-down: radiocarbon dioxide detection, a case study
Giusfredi G;Galli I;Mazzotti D;Cancio Pastor P;De Natale P
2015
Abstract
The theoretical bases of saturated-absorption cavity ring-down (SCAR) spectroscopy are treated and described in detail in different transition broadening regimes. All the approximations that are introduced to achieve a model as simple and accurate as possible are discussed. In the Voigt broadening regime, a calibration factor that relates the measured spectral areas in the saturated and linear absorption regimes is retrieved. A relevant application of this technique to the measurement of radiocarbon dioxide concentration at both enriched and natural abundance (similar to 10(-12)) is presented. The population relaxation rate of one ro-vibrational state of the nu(3) band is measured for this highly diluted CO2 isotopologue. (C) 2015 Optical Society of AmericaI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
