Murnick D E, Peer B J
Department of Physics, Rutgers University, Newark, NJ 07102.
Science. 1994 Feb 18;263(5149):945-7. doi: 10.1126/science.8310291.
A laser technique for analysis of carbon-13:carbon-12 ratios with the specificity of laser resonance spectroscopy and the sensitivity and accuracy typical of isotope ratio mass spectrometers is reported. The technique is based on laser optogalvanic effect spectroscopy, in which an electrical (galvanic) signal is detected in response to the optical stimulation of a resonance transition in a gas discharge species. Carbon dioxide molecular gas lasers are used, with the probed transitions being identical to the lasing transitions. Measurements for carbon dioxide samples with 100-second averaging times yield isotopic ratios with a precision of better than 10 parts per million.
报道了一种用于分析碳-13与碳-12比率的激光技术，该技术兼具激光共振光谱的特异性以及同位素比率质谱仪的灵敏度和准确性。该技术基于激光光电流效应光谱，其中通过对气体放电物种中的共振跃迁进行光激发来检测电（电流）信号。使用二氧化碳分子气体激光器，探测跃迁与激光跃迁相同。对二氧化碳样品进行100秒平均时间的测量，得到的同位素比率精度优于百万分之十。
