MEASUREMENT OF SMALL ABSORBANCES BY PICOSECOND PUMP PROBE SPECTROMETRY
MEASUREMENT OF SMALL ABSORBANCES BY PICOSECOND PUMP PROBE SPECTROMETRY
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DOI：
10.1021/ac00294a007
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发表时间：
1986-03-01
影响因子：
7.4
通讯作者：
WIRTH, MJ
中科院分区：
文献类型：
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作者：
BLANCHARD, GJ;WIRTH, MJ
对皮秒泵浦-探测基态恢复光谱的吸收灵敏度进行了严格的测试。研究发现，探测灵敏度受到探测激光器上量子噪声的限制。只有产生变换限制脉冲的激光器和高频三调制检测技术才能获得这种超高灵敏度。在进样体积内的检出限为9.6万个甲酚紫分子，灵敏度可与其他痕量吸收法相媲美，并提供了双色实验的额外选择性。
The absorption sensitivity of picosecond pump-probe ground state recovery spectrometry is examined critically. It Is found that the detection sensitivity Is limited by the quantum noise present on the probe laser. This ultrahlgh sensitivity Is at-tainable only with lasers producing transform limited pulses and a high-frequency triple modulation detection technique. With a detection limit of 96 000 cresyl violet molecules In the sampled volume, It Is shown that this technique Is comparable to other trace absorption methods for sensitivity and provides the added selectivity of a two-color experiment.