Abstract

In an endeavor to facilitate the use of stable isotopes in biological tracer research, we have developed a simple, real time procedure for reasonably accurate optical emission analysis of ¹⁵N and ¹³C in ammonium salts and bicarbonates, respectively. The amount of sample required for each analysis is in the range 10 to 100 μmol. In the procedure proposed, complicated chemical techniques have been avoided through (1) decomposition of the sample by heating; (2) removal of unwanted compounds, and regulation of pressure, by cooling; and (3) production of N₂ and CO⁺ from NH₃ and CO₂, respectively, by electrodeless microwave interaction. These three steps are followed by (4) measurement of relevant peak heights in the N₂ and CO⁺ spectra obtained.

Electrooptic effect calculations: simplified procedure for arbitrary cases

Theresa A. Maldonado and Thomas K. Gaylord
Appl. Opt. 27(24) 5051-5066 (1988)

Real-time standoff detection of nitrogen isotopes in ammonia plumes using a swept external cavity quantum cascade laser

Mark C. Phillips, Brian E. Brumfield, and Sivanandan S. Harilal
Opt. Lett. 43(17) 4065-4068 (2018)

Sensitivity analysis aimed at blood vessels detection using interstitial optical tomography during brain needle biopsy procedures

Julien Pichette, Andréanne Goyette, Fabien Picot, Marie-Andrée Tremblay, Gilles Soulez, Brian C. Wilson, and Frédéric Leblond
Biomed. Opt. Express 6(11) 4238-4254 (2015)

Robust procedure for fringe analysis

Mariano Rivera, Ramon Rodriguez-Vera, and Jose L. Marroquin
Appl. Opt. 36(32) 8391-8396 (1997)

Improved cw lasers in the 11–13-μm wavelength region produced by optically pumping NH₃

Klaus J. Siemsen, John Reid, and D. J. Danagher
Appl. Opt. 25(1) 86-91 (1986)