Error reduction in pulsed laser photothermal deflection spectrometry.
Error reduction in pulsed laser photothermal deflection spectrometry.
复制标题
脉冲激光光热偏转光谱测定中的误差减少。
DOI：
10.1021/ac00292a020
复制
发表时间：
1986
影响因子：
7.4
通讯作者：
Bialkowski,SE
中科院分区：
文献类型：
--
作者：
Long,GR;Bialkowski,SE
Pulsed lasers are characterized by poor pulse-to-pulse energy and modestability thereby limiting their use In experiments sensitive to spatial variations. In this paper we present both experimental and computational methods of reducing the errors associated with mode and pointing instability In photothermal deflection experiments where a pulsed laser Is em-ployed. By use of these methods, a substantial reduction In the signal variance can be realized. These methods give the pulsed laser experiments a precision approaching, and In some cases exceeding, that of continuous wave laser tech-niques.Photothermal spectrophotometry has been shown to be a very sensitive method for the analysis of species that undergo radiationless relaxation from an optically excitedstate. There are actually several techniques used in photothermal spec-trophotometry that are related by the fact that they all probe the refractive index profile created by the radiationless re-laxation of the analyte (1-3). These techniques are all based on the effect that the refractive index profile, created by the radiationless relaxation mechanism, has on the propagation of a laser beam used to monitor this profile. The exact method of probing the refractive index profile differentiates among the techniques. For example, the gradient of the refractive index is monitored in photothermal deflection spectropho-tometry (PDS)(1, 4-7) and in moire deflectometry (8), and
