Monitoring CO2 concentration and δ13C in an underground cavity using a commercial isotope ratio infrared spectrometer

CO2 isotope sensor using a broadband infrared source, a spectrally narrow 4.4 μm quantum cascade detector, and a Fourier spectrometer

We report a prototype CO2 gas sensor based on a simple blackbody infrared source and a spectrally narrow quantum cascade detector (QCD). The detector absorption spectrum is centered at 2260 cm−1 (4.4 μm) and has a full width at half maximum of 200 cm−1 (25 meV). It covers strong absorption bands of two spectrally overlapping CO2 isotopomers, namely the P-branch of CO2 and the R-branch of CO2. A...

Development and airborne operation of a compact water isotope ratio infrared spectrometer.

A sensitive laser spectrometer, named IRIS (water isotope ratio infrared spectrometer), was developed for the in situ detection of the isotopic composition of water vapour in the upper troposphere and the lower stratosphere. Isotope ratio measurements can be used to quantify troposphere-stratosphere exchange, and to study the water chemistry in the stratosphere. IRIS is based on the technique o...

Development of a Near-Infrared Cavity Ring-Down Spectroscopy System for CO2 Isotope Detection

Carbon dioxide detection has been of interest to scientists for several years due to the importance of atmospheric carbon concentrations and its effects on Earth’s climate. To help monitor and predict transport of atmospheric carbon, NASA created the Active Sensing of CO2 Emissions over Nights, Days and Seasons (ASCENDS) program. Working alongside NASA, Colorado State University has developed a...

b isotope ratio measurements using two Daly detectors equipped on an ICP - mass spectrometer

The simultaneous detection of Pb and Pb ions has been made by multiple-ion counting ICP-mass spectrometry using two Daly detectors (MC-ICPMS). To evaluate the long-term gain stability of the detectors, Ba/Ba and Ba/Ba ratios have been measured by a combination of Daly and Faraday detectors (Ba(D)/Ba(F)) and an electron multiplier and Faraday detectors (Ba(EM)/Ba(F)). The measured Ba(EM)/Ba(F) r...

Infrared Spectroscopy with a Cavity Ring-Down Spectrometer