Title :
Measurement of 7Li/6Li Isotope Ratio Using Phase-Conjugate Degenerate Four-Wave Mixing in a Graphite Furnace
Author :
Xunli Yin ; Xuemei Cheng ; Kun Fei ; Jintao Bai ; Zhaoyu Ren
Author_Institution :
State Key Lab. Incubation Base of Photoelectric Technol. & Functional Mater., Northwest Univ., Xi´an, China
Abstract :
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 sample concentration and power conjugation are determined. Under the optimized conditions, we measured 7Li/6Li isotope ratio in Li standard solution with PCDFWM to be 11.571 ± 0.003, which is in good agreement with the value calculated by atomic absorption spectroscopy but has a preferable resolution. The detection limit as 15.54 ng/mL is achieved. The information obtained from this paper suggests that PCDFWM is a reliable laser spectroscopic technique with high resolution in isotope ratio measurement and trace analysis for various applications such as geochemical exploration.
Keywords :
atomic absorption spectroscopy; lithium; measurement by laser beam; multiwave mixing; optical phase conjugation; 6Li; 7Li; 7Li/6Li isotope ratio; Doppler-free resolution; PCDFWM; atomic absorption spectroscopy; geochemical exploration; graphite furnace atomizer; laser spectroscopic technique; optimal sample concentration; phase-conjugate degenerate four-wave mixing; power conjugation; trace analysis; Absorption; Atomic measurements; Graphite; Isotopes; Laser beams; Measurement by laser beam; Probes; Isotope ratio; Lithium; Phase-conjugate degenerate four-wave mixing;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2014.2329935
