Trace determination of some aromatic molecules by laser two-photon ionization

✍ Scribed by Sunao Yamada; Teiichiro Ogawa; Peihuan Zhang

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 380 KB
• Volume: 183
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(86)80093-9

✦ Synopsis

A simplified yet sensitive system is described for the detection of the twophoton ionization signal in solution. The photo-ionization cell consists of a quartz cuvette and a pair of stainless steel electrodes. Several aromatic compounds, including quinones, can be detected in the ng l-I-mg 1-l range both in hexane and in methanol; detection limits of pyrene in hexane and in methanol are 0.02 pg 1-l and 4 rg l-l, respectively. The detectability in hexane is much better than that in methanol. The detection limits and the molar absorptivities at the excitation wavelength are shown to be correlated.