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Isotopic Ratio Measurements of Atmospheric Carbon Dioxide Using a 4.3 μm Pulsed Quantum Cascade Laser
2007 Edition, May 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We report CO2 isotopic ratios (13C, 18O) measured in air using a pulsed quantum cascade laser at 2310 cm-1. Performance is improved by analyzing the deviations between the sample spectra and simultaneously acquired reference spectra.

Shining infrared light on isotope ratio measurements in applications from earthbound to the atmospheric
2005 Edition, Volume 2, January 1, 2005 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We present accurate water isotope ratio measurements using DFB diode lasers in laboratory based studies in biomedicine, paleoclimatology (ice-cores), and ecology (plant leave water), to airborne, in-situ, stratospheric measurements using...

Application of collision reaction-cell based MC-ICPMS to in-situ interferences resolution for elemental and isotopic ratios measurements of nuclear fuel samples
2009 Edition, June 1, 2009 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Two direct applications of a collision-reaction cell based Multiple-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICPMS) for the resolution of isobaric interferences are presented. The first one is the determination of 90Sr/238U elemental ratio by...

Cavity ring-down spectroscopy for the isotope ratio measurement of methane in ambient air with DFB diode laser near 1.65 μm
2017 Edition, June 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The near infrared continuous-wave cavity ring-down spectroscopy (CW-CRDS) technique is used to determine the isotope ratio of atmospheric methane. A narrow linewidth distributed feedback (DFB) diode laser was used to achieve high sensitivity...

Improvement in Thermal-Ionization Mass Spectrometry (TIMS) using Total Flash Evaporation (TFE) method for lanthanides isotope ratio measurements in transmutation targets
2011 Edition, June 1, 2011 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The experiments involved in the PHENIX french nuclear reactor to obtain precise and accurate data on the total capture cross sections of the heavy isotopes and fission products require isotopic ratios measurements with uncertainty of a few per mil....

High sensitivity isotope concentration-ratio measurement CO/sub 2/ infrared laser system. II
2000 Edition, January 1, 2000 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

For high sensitivity measurements of isotope concentration-ratios of trace-level gas mixture, particularly including carbon dioxide isotopes, we tested a /sup 12/CO/sub 2/-/sup 13/CO/sub 2/ composite laser system containing...

Trace-level isotope concentration-ratio measurement /sup 12/CO/sub 2/-/sup 13/CO/sub 2/ laser system
2001 Edition, Volume 2, January 1, 2001 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

For high sensitivity measurements of isotope concentration-ratios of trace-level gas mixtures, particularly including carbon dioxide isotopes, we tested a /sup 12/CO/sub 2/-/sup 13/CO/sub 2/ composite laser system containing...

The effect of residual adsorbed gases on silicon isotope amount ratio measurements [in Avogadro constant determination]
1998 Edition, January 1, 1998 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

An adsorption model developed for molecular flow inlet system was applied successfully to remove memory effects in high accuracy isotopic measurements, especially in the Si isotopic measurements leading to improved values for the Avogadro constant.

Evaluation of 2-μm Pulsed Integrated Path Differential Absorption Lidar for Carbon Dioxide Measurement—Technology Developments, Measurements, and Path to Space
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The societal benefits of understanding climate change through the identification of global carbon dioxide sources and sinks led to the recommendation for NASA's Active Sensing of Carbon Dioxide Emissions over Nights, Days, and Seasons space-based...

Measurement of 7Li/6Li Isotope Ratio Using Phase-Conjugate Degenerate Four-Wave Mixing in a Graphite Furnace
2015 Edition, Volume 21, January 1, 2015 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

To obtain a Doppler-free resolution, we employ phase-conjugate degenerate four-wave mixing (PCDFWM) to isotope selectively analyze 6Li and 7Li in a graphite furnace atomizer. After the investigation of concentration and power dependences of PCDFWM, the optimal...

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