Development of Multiphoton Ionization Technique for Detection of Polycyclic Aromatic Hydrocarbon (PAH) in Solution

Hoa Do Quang^1*, Duong Vu¹, Nghia Nguyen Trong¹, Totaro Imasaka²

¹Center for Quantum Electronics, Institute of Physics, Vietnam Academy of Science and Technology (VAST), Hanoi City, Vietnam.
²Department of Applied Chemistry, Kyushu University, Fukuoka, Japan.

DOI: 10.4236/ojapps.2015.510058                

Abstract

A simple low-cost system for detection of polycyclic aromatic hydrocarbon (PAH) in solution based on multiphoton ionization configuration is designed using a circulating ionization cell of 0.1 × 2 × 5 mm dimension with quartz optical window. Fourth harmonic emission of Nd:YAG laser (266 nm, 6 ns, 10 Hz, and 2 mJ) and second harmonic generation of distributed feedback dye laser (278 - 286 nm, 20 ps, 10 Hz, and 300 μJ) were used as the ionization source. A high voltage of 800 V was applied to separate the ions after ionization. The photocurrent includes a sharp peak and a broad tail indexed to electron and ion currents, respectively. The lowest concentration of anthraxcene (C14H10) in order of few nano-grams per milliliter was detected by this multiphoton ionization configuration.

Keywords

UV Laser, Multiphoton Ionization, Polycyclic Aromatic Hydrocarbon

Conflicts of Interest

The authors declare no conflicts of interest.

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