利用亚多普勒激光波混频光谱法对火焰原子化器中铷的超精细结构进行痕量分析。

Trace analysis of rubidium hyperfine structure in a flame atomizer using sub-Doppler laser wave-mixing spectroscopy.

作者信息

Weed Kenneth M, Tong William G

机构信息

Department of Chemistry, San Diego State University, San Diego, California 92182, USA.

出版信息

Appl Spectrosc. 2003 Dec;57(12):1455-60. doi: 10.1366/000370203322640071.

DOI:10.1366/000370203322640071

PMID:14686765

Abstract

Nonlinear laser wave mixing is a versatile spectroscopic method for trace elemental analysis at high spectral resolution. Sub-Doppler spectral resolution allows isotope and hyperfine structure measurements of some of the elements even when using a room-pressure analytical flame (i.e., sub-Doppler but Lorentzian broadened spectra). A non-planar wave-mixing optical setup offers some advantages as compared to the conventional planar wave-mixing setup including better signal collection efficiency and easier optical alignment. Using our absorption-based wave mixing, a detection limit of 0.05 ng/mL (i.e., 50 parts-per-trillion) is reported for Rb in an air/acetylene flame, while still maintaining sub-Doppler spectral resolution for the infrared 780.0-nm Rb transition line.

摘要

非线性激光波混频是一种用于高光谱分辨率痕量元素分析的通用光谱方法。亚多普勒光谱分辨率使得即使在使用常压分析火焰时（即亚多普勒但具有洛伦兹展宽光谱），也能够对某些元素进行同位素和超精细结构测量。与传统的平面波混频装置相比，非平面波混频光学装置具有一些优势，包括更好的信号收集效率和更容易的光学对准。使用我们基于吸收的波混频，在空气/乙炔火焰中对铷的检测限报告为0.05 ng/mL（即万亿分之五十），同时仍能保持对红外780.0 nm铷跃迁线的亚多普勒光谱分辨率。